Habitus Aquatica : Journal of Aquatic Resources and Fisheries Management (Habitus Aqua J; e-ISSN 2721-1525) is published by Department of Aquatic Resource Management, Faculty of Fisheries and Marine Sciences, IPB University. Habitus Aquatica is published periodically twice a year, containing the peer reviewed publication of basic and applied research articles in a broad range of subject areas relevant to aquatic and fisheries science. The journal publishes articles, short communications, and reviews that contribute to a scientific understanding in the areas of Aquatic Science including and related to structure and dynamics of aquatic ecosystems, impacts and adaptations to pollution and global changes, socio-economical analysis of environmental benefits, impacts and bioconservation, ecosystems restoration and ecological engineering; and Fisheries Science including fisheries biology, aquaculture, environment, chemistry and biochemistry.
Department of Aquatic Resources Management, Faculty of Fisheries and Marine Science, IPB University
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Life stages, growth, and habitat suitability of Clupeiformes in Biru Bay, Bali Strait
Biru Bay, a lift-net fishing ground in the Bali Strait, plays a key role in supporting Clupeiformes fishery production in Muncar and the surrounding Bali Strait region. This study aims to evaluate the species composition and growth patterns of Clupeiformes caught in Biru Bay and their relationship with environmental parameters. Sampling was conducted during the northwest monsoon (December 2023, February 2024) and the first transitional season (March–April 2024). Data analyses included assessments of species composition, length-weight relationships, condition factors, spatiotemporal variability of oceanographic parameters, and Canonical Correspondence Analysis. Clupeiformes catches during both seasons consisted of six species, with monthly variation in predominant species. Most of the individuals were juvenile fish, with the exception of Spratelloides delicatulus, which was frequently found in both juvenile and adult stages. The majority of species exhibited positive allometric growth and were in good condition (CF > 1.00). Physicochemical parameters varied over time, supporting the presence of fish in this area. Chlorophyll-a levels decreased during the northwest monsoon but increased before the transitional season, showing an inverse pattern to sea surface temperature. Four key environmental parameters—temperature, salinity, dissolved oxygen, and chlorophyll-a—were significantly associated with the composition of Clupeiformes.
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Comparative study of nutritional content of SDD drying bedetan perancak for lemuru fish management in Jembrana, Bali
Bedetan perancak is an innovative sardine processing product (cat sardine and protolan types) made by the Bedetan Perancak Women Farmers Group (KWT) in Jembrana Regency. It is dried using an eco-friendly Solar Dryer Dome (SDD) technology with a capacity of 200 kg per 3 days. This study compared the nutritional content of two Bedetan variants—unseasoned and seasoned—both were dried using SDD. The analysis covered moisture, ash, protein, fat, carbohydrates (by difference), and estimated energy (kcal). Results indicated that moisture and ash were higher in the seasoned variant, at 11.38% and 7.23%, respectively. Protein content was high in both variants: 62.89% (unseasoned) and 63.81% (seasoned). Fat content was similar, ranging between 15.03% and 15.13%. Carbohydrates were higher in the unseasoned variant (5.89%) than in the seasoned one (2.54%). Energy values were 411.30 kcal (unseasoned) and 400.70 kcal (seasoned). Adding seasoning affected moisture and ash but did not significantly affect protein and fat. Both variants met the SNI 8273:2023 standard for dried fish moisture (max 40%; ideal 15–20%), with moisture well below the ideal limits. This shows that SDD technology is environmentally friendly and enhances nutritional quality of Bedetan.
Heavy metal content in the eyes of yellowfin tuna (Thunnus albacares, Bonnaterre 1788) from Aceh Waters as raw material for fish oil
Yellowfin tuna (Thunnus albacares) is one of Indonesia’s leading fishery commodities, with high potential as a raw material for fish oil, especially from the eye tissue, which is rich in omega-3 fatty acids. This study aimed to evaluate the heavy metal content in yellowfin tuna eyes from Aceh waters to ensure the safety of extracted fish oil. Eye samples were obtained as by-products from a tuna fillet processing industry in Banda Aceh. Preparations were carried out by separating soft tissues from hard parts, followed by oil extraction using the cold water extraction method. Characterization included morphometric analysis and determination of heavy metal contents (Hg, Pb, Cd, As) using Atomic Absorption Spectrophotometry (AAS), based on national (SNI) and international (Codex Alimentarius 2017) standards. Results showed that Hg, Pb, and Cd were not detected, while As was present at a concentration of <0.005 mg/kg—well below safety thresholds. These findings indicate that yellowfin tuna eye oil from Aceh is safe for consumption and holds promising potential as a high-value functional food or dietary supplement ingredient.
Marine environmental factors influencing the rate of second-year transition of Rishiri Kombu in Rebun Island
The transition of Saccharina japonica var. ochotensis (Rishiri Kombu) from its first to second year of growth is crucial for commercial harvest. However, recent increases in seawater temperature and nutrient depletion are likely to influence this process. This study investigates the influence of autumn seawater temperature and nitrate concentrations on the second-year transition rate of Rishiri Kombu in northern Hokkaido. Field surveys were conducted from 2020 to 2024 at Ishikari and Rebun, where the population densities of first- and second-year individuals were quantified. Concurrently, in situ measurements of seawater temperature and nitrate concentrations were performed during autumn. The results indicate that higher seawater temperatures tend to be associated with lower second-year transition rates, whereas increased nitrate concentrations positively correlate with transition success. Statistical analyses suggest that nutrient availability has a stronger influence on transition rates than temperature changes. These findings suggest that nitrate depletion is a key limiting factor for the sustainability of Rishiri Kombu, highlighting the importance of monitoring climate-driven changes in nitrate availability in coastal ecosystems.
Coral reef health evaluation on Pramuka Island: Conservation challenges and opportunities in the Seribu Islands Area
Pramuka Island is one of the islands in the Thousand Islands which is the administrative center. Coral reef ecosystem is known as the most beautiful and charming underwater ecosystem and has the richest community on earth. Government of Thousand Islands utilized this as local marine tourism. However, tourism activities have the potential to affect the condition of the coral reef ecosystem. Coral reef ecosystem condition monitoring are carried out to prevent environmental damage. Observation of coral reef data was carried out using the Line Intercept Transect (LIT) method which was modified according to the needs of data observation. The percentage of basic substrate cover is dominated by abiotic, hard coral, and algae categories. The condition of coral reefs in the observation location is classified as moderate. There are 2 observation stations with good coral reef cover, namely APL (Marine Protected Areas) and SPG (South of Roast Island). Locations with poor cover categories are found in BPR (West of Scout Island) and TEP (Cape Eagle Scout).
Copyright (c) 2025 Habitus Aquatica https://creativecommons.org/licenses/by-sa/4.0
Reproductive biology of shortfin scad (Decapterus macrosoma) inBanda Sea landed at TPI Sodoha, Kendari Southeast Sulawesi
This study aims to determined of the reproductive biology of the shortfin scad (Decapterus macrosoma) including sex ratio, gonad maturity level, gonad maturity index, fecundity, and size at first sexual maturity. This study was carried out from January to February 2025 at the fish auction place (TPI) Sodoha, Kendari. Fish samples were obtained from catches in the western Banda Sea using mini purse seines and landed at the Sodoha TPI, Kendari. Samples were separated by sex, then measured for length using a ruler with an accuracy of 0,5 mm and then measured for fish weight with a digital scale with an accuracy of 0.01 grams. Observation of the gonad maturity level was carried out by morphological and determination of fecundity using the gravimetric method. The results of the male and female sex ratio study showed an unbalanced, that is male of 105 individuals and female of 52 individuals. The level of male and female gonad maturity was dominated by the immature gonad category, and the male gonad maturity index ranged from 0.0830-2.5847% and the female ranged from 0.0971-2.4535 %. The first sexual maturity size of male and female shortfin scad were 232 mm and 224 mm, respectively, with fecundity ranging from 15,495 to 544,110 eggs.
Temporal distribution of waste production at the Cituis FishLanding Base
This study aims to analyze garbage waste data by day in a week at the Cituis Fish Landing Base (PPI Cituis), identify the causes of waste issues, and provide recommendations for waste management and handling. The research was conducted over two weeks of observation. Data were collected through waste characterization, total and average garbage waste volume measurements, the number of waste containers, and waste type composition from several source points. The results show that waste volume tends to increase at the end of the month, on weekends, and during holidays, following higher visitor numbers and fishing activities. Inorganic waste, especially plastic was the most dominant type across all port zones. The 3 kg container representing the harbor area had the highest percentage of waste bins compared with the 4 kg and 10 kg containers. Proper waste management is necessary to minimize pollution impacts at PPI Cituis and the surrounding environment. Recommended actions include improving waste facilities, strengthening governance and regulations, and enhancing community awareness and participation.
Potential and Ecotourism Development in The Wee Boro Lake, Tebara Village, West Sumba District
Wee Boro Lake is located in Tebara Village, West Sumba Regency. Wee Boro Lake was widely promoted as a tourist attraction on May 31 2023 and was attended by the regent of West Sumba, all village heads in West Sumba Regency, as well as other important stakeholders. Wee Boro Lake is located at the coordinates (°39'54" South Latitude and 119°25'13" East Longitude). This research aims to find out the level of suitability of tourism at Lake Wee Boro. The analysis used in this research is SWOT analysis as a method for developing conditions and evaluating a problem based on internal factors (Strength and Weakness) and external factors (Opportunity and Threats). The research results show that the appropriate ecotourism activity to carry out at Lake Wee Boro is boating. Sitting and camping activities are only suitable to be carried out at station 1. Fishing activities are not or are not yet suitable to be carried out at Wee Boro Lake. Camping, boating, fishing and relaxing tourism activities respectively have a carrying capacity of 176 people/day, 636 people/day, 8 people/day and 40 people/day.
Addition of Seagrass Flower Waste in Food to Growth Rate and Survival Rate of Koi Fish (Cyprinus rubrofuscus)
Fish feed should contain all the necessary nutrients, including protein, fat, carbohydrates, vitamins and minerals. Some alternative feed ingredients can be used in the preparation of feed, one of which is seagrass leaf meal. The aim of this study was to determine the effect of adding seagrass leaf meal to the diet on specific growth rate and survival of ornamental Koi (Cyprinus rubrofuscus). The research was conducted for 28 days at Bhayangkara Residence Baiti Jannati Block T1 No. 3 Sumbawa Regency. The method used was an experimental method using a completely randomized design (CRD) with 5 treatments with 3 replicates so that 15 experimental units were obtained. The treatments tested were the addition of different seagrass leaf meal to the diets consisting of P1: control (no addition of seagrass leaf meal), P2: 3% seagrass leaf meal, P3: 6% seagrass leaf meal, P4: 9% seagrass leaf meal and P5: 12% seagrass leaf meal. The results showed that the highest to lowest average specific growth rate was P5 treatment at 2.29%, followed by P4 at 1.52%, P3 at 1.40%, P2 at 0.34%, and P1 (control) -1.15%. As for the survival rate, P5 treatment 87%, P4 80%, P3 and P2 67% each, and the lowest P1 (control) 53%. The addition of seagrass leaf meal to the diet affected the specific growth rate and survival rate of koi (C. rubrofuscus). The addition of a 12% seagrass leaf meal dose is the best treatment that can provide a specific growth rate of 2.29% and a survival rate of 87%.
The Community Perception of Waste Management on The Belawan Coast, North Sumatra
The abundant natural potential in the Belawan coastal area has great opportunities for the development of various activities. In addition, the Belawan coastal area is also vulnerable to high pollution, especially because of its role in supporting the regional economy through sectors such as tourism, fisheries, transportation, and industry. Effective waste management is a special concern of the government along with maximum efforts in developing economic potential. Waste has become a global problem, especially in Indonesia with its increasing population growth. This research aims to analyze strategies for controlling pollution from waste in the Belawan coastal area. The method used is a Likert Scale to evaluate the community's perception of the issue of waste problems. On the economic aspect, the community assessed that waste management has not had a significant impact, but on the social aspect, waste management was rated positively with the highest score reaching 68,80 which was obtained on waste management activities that increased fraternal ties. The problem of low sanitation awareness is the main obstacle that requires solutions based on community participation in waste management.
Water Quality Status of the SDGs Lake of IPB Campus, Dramaga, Bogor, West Java
Lakes are aquatic ecosystems surrounded by land. Lakes have many uses, namely as habitats for aquatic biota and for tourism, mitigation, and education. Human activities around Lake SDGs IPB Dramaga have a negative impact on the lake environment. This study aims to compare the water quality status of SDGs lakes with CCME and the Pollution Index. The research used two time periods, namely October 2024 and March 2024, with three station points. The research results show that four parameters do not meet quality standards, with more parameters occurring in October 2023. Water quality status measurement using the lake pollution index is in the moderate category, while for CCME WQI, the lake is classified as in poor condition. The pollution index has a smaller standard error and deviation than the CCME WQI method. Hence, the pollution index method is more accurate in measuring the water quality status in Lake SDGs IPB Dramaga in these two periods.
Inventory, Biodiversity Fish Inventory in the Cikaniki Area of Mount Halimun Salak National Park
Indonesia has high biodiversity, making it the country with the second largest biodiversity in the world. To preserve this wealth, the government has established conservation areas, including the Gunung Halimun National Park in West Java, which is the largest tropical rainforest on the island of Java with unique flora and fauna. This research was carried out in the Citalahab River, part of the national park, to identify the fish species present. Sampling used a purposive sampling method, and fish species were identified based on data from gbif.org, fishbase.org, as well as the latest literature. The results of the research show that there are seven species of fish in the Cikaniki area, namely Puntius sp. (wader fish), Channa sp. (snakehead fish), Xiphophorus sp. (swordtail fish), Glyptothorax sp. (kekhel fish), Gambusia sp. (cere fish), Rasbora sp. (spray fish), and Monopterus sp. (field eel). Each species is described based on its morphological characters and habitat. These results emphasize the importance of conserving natural river habitats, because species diversity plays an important role in maintaining ecosystem stability and ecological balance.
Abundance and Ecology Index of Plankton in Island Seurudong Waters, South Aceh
Plankton are organisms that live in the ocean water column and move with the currents. The plankton is divided into two types, namely phytoplankton and zooplankton. This study aims to determine the abundance anda ecologycal index of phytoplankton and zooplankton in the waters of Seurudong Island, South Aceh district. Water sampling with a volume of 100 liters was filtered using a plankton net at each station. There are 3 sampling locations. Each station has 4x repeats. Measurement of water quality is carried out simultaneously with water sampling to identify the type of plankton. The results of this study indicate that there are differences in abundance at each station. The abundance of phytoplankton at station 1 was 12520 cells/L, Station 2 was 5643 cells/L, and Station 3 was 3510 cells/L. The abundance of zooplankton at station 1 was 918 ind/L, station 2 was 1225 ind/L and station 3 was 1575 ind/L. Based on ecologycal index, phytoplankton and zooplankton respectively showed H’ (0,97 – 1,05), C (1,0) dan E (0,26 – 0,33) while H’ (0,55 – 0,78), C (1,0) dan E (0,21 – 0,24). The composition of phytoplankton and zooplankton in these waters is closely related to the quality of the waters and food sources for other organisms.
Trophic State of Situ Patengan, Bandung Regency, West Java
Situ Patengan is designated as a Natural Tourism Park, offering recreational opportunities. However, human activities in the surrounding area can introduce both organic and inorganic materials, leading to changes in the lake’s trophic conditions. The trophic state level, which indicates the presence of nutrients, is used to evaluate the potential for the utilization of water bodies. The aim of this study was to assess the trophic state of Situ Patengan in Bandung Regency, West Java. Water samples were collected from the lake at four locations over three sampling periods. The trophic index (TRIX) method was applied to evaluate the lake’s trophic state. Total phosphate concentrations ranged from 0.041–0.187 mg/L, dissolved inorganic nitrogen concentrations varied between 0.20 and 0.64 mg/L, and chlorophyll-a levels ranged from 10.08 to 33.83 μg/L. According to the TRIX classification, the trophic state of Situ Patengan is considered eutrophic, with values ranging from 4.25 and 6.54. This information is valuable for predicting potential increases in trophic levels and guiding the sustainable management of Situ Patengan ecosystem.
Microbiological Testing for Bacteria Salmonella sp. on Tilapia (Oreochromis niloticus) Using ISO 6579-1:2017 Method at UPTD PPMHP Banten
Fish is a food source that is available in large quantities in Indonesia. Indonesia's fisheries production is recorded as occupying the third largest position with total production of 6.43 million tons in the world (FAO 2022). Tilapia is a perishable food so it needs to be handled well so that the freshness of the fish is maintained. The quality of freshness can include appearance, taste, smell and texture which will be consciously or unconsciously assessed by buyers or users of the product. Apart from the freshness and high nutritional value of tilapia, there are aquatic pathogenic microorganisms that can cause disease in humans, for example nausea, diarrhea and stomachache. The presence of microbes in fish can affect quality, such as reducing the freshness of fishery product quality and consumer welfare. Pathogenic bacteria that are often found include Salmonella sp. UPTD PPMH Banten is the organizer of quality control and safety of certified fishery products as well as a quarantine center for microbiological testing of pathogenic bacteria in fishery products, one of which is Salmonella sp. The purpose of the test is to find out the correct testing procedures and according to the procedures, to find out the results of the analysis of Salmonella sp. contamination. on tilapia. Microbiological testing method for Salmonella sp. bacteria. carried out by referring to the standard procedure ISO 6579-1:2017. Results of microbiological testing for Salmonella sp. with the addition of ATCC: 14028 Salmonella Typhi culture in tilapia fish showed positive results for Salmonella sp..
River Water Quality Status Based on Variation in Family Biotic Index in Jilu River Malang City - East Java
Biological indicators utilize animals as markers to assess water quality in specific water bodies. Among various bioindicators, benthos is widely used for evaluating river water quality due to its sensitivity to environmental changes and its tendency to remain in specific areas. This study aimed to determine the water quality status of the Jilu River. Sampling was conducted using a purposive sampling method, with macroinvertebrates collected using a grab sampler to extract sediment from the riverbed. The sediment was then sieved to isolate benthic organisms from five locations with varying characteristics: industrial area, rice fields, natural riparian zone, residential area, and educational tourism park. The Family Biotic Index (FBI) was used to analyze the benthic macroinvertebrates, identifying 11 families: Thiaridae, Tubificidae, Chironomidae, Viviparidae, Simuliidae, Philopotamidae, Baetidae, Heptageniidae, Gecarcinucoidea, Caenidae, and Coenagrionidae. The Thiaridae family dominated across all locations. Based on FBI analysis, water quality along the Jilu River ranged across three categories: good, moderate, and very poor. The findings highlight the need for effective management strategies to mitigate pollutant loads and preserve the river’s water quality.
Phytoplankton Diversity and Relationship with Water Quality of Cikoncang Reservoir, Lebak Regency
Phytoplankton are aquatic biota that have a rapid reaction to changes in water quality. Increased activities such as tourism and KJA in Cikoncang Reservoir can potentially reduce water quality. Phytoplankton is a bioindicator of water quality, phytoplankton diversity can describe water conditions. The purpose of the study was to analyze phytoplankton diversity, water quality, and the relationship between diversity and water quality of Cikoncang Reservoir. The research was conducted in March and April 2023. There were 5 research stations taken based on the purposive sampling method. Phytoplankton diversity is generally included in moderate diversity with a stable community and the distribution of individuals of each species with a range of values of 1.857–2.122. Based on the saprobity index, it can be seen that the Cikoncang Reservoir waters are included in moderate to light pollution. Based on PCA analysis, diversity has a positive relationship or correlates with brightness, temperature, DO, pH, nitrate, and TDS.
Occurrence of biennial Sporophytes of the Kelp Saccharina japonica in Hokkaido, Japan
Recent studies suggest that relict communities of Saccharina japonica var. ochotensis are rarely observed in southwestern Hokkaido, where S. japonica. var. religiosa is generally distributed. Previous research has mainly focused on the morphology of these species, and field survey data is very limited. In the present study, relict S. japonica var. ochotensis communities were observed only near the estuaries of larger rivers, specifically in estuarine areas where bedrock is present and the seashore has a gentle gradient slope. The biomass and size (length, width, and weight) of annual and biennial relict S. japonica. var. ochotensis were recorded. The carbon/nitrogen ratio of the kelp sporophytes was analyzed, and relatively lower values were observed in the relict community of this species. This information may help in the maintenance of kelp beds in southwestern Hokkaido and the wise utilization of relict S. japonica var. ochotensis in the estuarine areas of southwestern Hokkaido, Sea of Japan.
Influence of Beach Morphology on Hawksbill (Eretmochelys imbricata, Linneaus 1766) Nesting Preference in Belanda and Kayu Angin Bira Island
Decreased of population due to illegal hunting makes the hawksbill be a protected animal. In addition, this is allegedly due to presence of environtment parameters that are not in accordance with characteristic in hawksbill nesting habitat with the result that influencing on decreased of hawksbill population. This study purposed to assase the hawksbill nesting habitat and analyse morphology features that suspected influence nesting acativity of hawksbill in Belanda and Kayu Angin Bira island. The research was done on Augst 2017 in Belanda and kayu Angin Bira Island. Any several data was collected, that’s primary (beach slope and width) and secondary (data was collected in the past of 5 years, that’s from 2012 until 2016). The result showed width as the morphological features that influence the nesting preference of hawksbill.
Species Inventory of Fish in Cibanten River Serang District
Cibanten lake is upstream of the Cibanten river basin which is a collection of springs and then flows as far as ± 42.07 km into Banten Bay. This study aims to inventory the types of fish in the Cibanten river basin. Sampling was carried out in May-June 2017 and in October 2018 in the upstream, middle and downstream areas of the Cibanten river basin. Data were analyzed diversity with the Shannon-wiener diversity index and the Index of Biotic Integrity. During the study 80 fish from 6 species were obtained, i.e.: Tor sp., Rasbora aprotaenia, and Puntius sealei in the upstream; Barbonymus gonionotus and Pterygoplichthys pardalis in the middle of Cibanten river basin; and Dermogenys pusilla in the downstream. Based on the diversity index value and the Index of Biotic Integrity, the health of ecosystems in the Cibanten river basin is already disturbed, especially in the middle and downstream.
Utilization and Fishing Season of Sentinel Crab (Macrophthalmus japonicus de Haan 1835) in East Coastal Water in Surabaya City
Fishing activities on the east coast of Surabaya use a variety of simple fishing gear. One who tries to fish by picking crabs as the target of the catch. Fishermen use a sled (skilot) gliding over a stretch of mud to launch a catching target in the form of a sentinel crab (Macrophthalmus japonicus) whose carapace conditions are still soft. Crabs with hard carapace conditions are not captured by fishermen. This study aims to determine the species of sentinel crab resources the target is catching, the location of the catchment area of sentinel crabs and understand the pattern of the fishing season. The method used in the research is descriptive survei method. The study was conducted in February until July 2018. The research location was in the coastal city of Surabaya. Respondents were fishermen caught by sentinel crabs with catchment locations on the east coast of Surabaya City. To determine the type of species, samples were carried out several times on catches, each amounting to 25 sentinel crabs in soft carapace conditions. The location of the captured area is determined by the fishermen, while making a map of the location using the Arcview 3.3 program. The pattern of fishing season is done by determining the value of the Fishing Season Index (FSI). The results of the study are as follows: 1). The types of sentinel crabs that are targeted by fishermen are Macrophthalmus japonicus; 2). The fishing ground of the sentinel crab is on the tidal stretch with a muddy base in the East Coast region of Surabaya at coordinates 7014’24”–7015’05” South Latitude and 112048’09”– 112049’04” East Longitude; 3). The fishing season pattern for sentinel crabs based on the FSI is that the peak season successively takes place in the months: April(612,96%), and May (164,68%). Medium season: July (77,76 %), March (68,61%), February (64,04%), and January (59,47%). Low season: June (42,69%), November (36,59%), August (32,02%), October (18,30%), December (18,30%), and September (4,57%).
Survival of Patin Fish (Pangasius sp.) Seeds with Palm Shell Activated Charcoal Treatment Transported in a Closed System
One of common problem in fishing industry is a high mortality rate of juvenile fish during transportation. The present research aimed to study the characteristics of palm oil activated carbon and its effect on the changes of water quality that can improve the survival rate of juvenile catfish (Pangasius sp.). During study, juvenile catfish was transported for 48 hours by a simulation in the room with two different treatments: water tanks supplied with granulated and powder activated carbon and one control. Results of FTIR analysis showed that the activated carbon contained several functional groups such as Alkanes, Carboxylic Acid and Amina. Activated carbon element content resulted from the SEM analysis consisted of C, O, Si, N, Zr, Cu, Al and K. After transformed as activated carbon, we found that water and organic C contents in oil palm shell decreased and, reversely, the ash content increased. The study revealed that the activated carbon powder was better to improve survival rate of juvenile catfish and maintain water quality compared to granule ones where the survival rates after 48 hour transportation were 47,5%, 11% and 0% with treatments of powdered activated carbon, granulated activated carbon and control, respectively.
Reproductive Biology of Scalloped Spiny Lobster (Panulirus homarus Linnaeus, 1758) in Palabuhanratu Bay
Scalloped spiny lobster (Panulirus homarus) is one of lobster species that can be found in Palabuhanratu Bay. Information about the reproductive biology of lobster is needed for lobster fisheries management. This study was conducted to analyze the reproductive biology aspect, the spawning season, and to find out the lobster fisheries condition due to the size at sexual maturity of Panulirus homarus in Palabuhanratu Bay. This study was conducted in October 2016 until March 2017. Carapace length and weight of lobster were measured, then laboratory analysis was carried out for the berried female lobster. Size at sexual maturity of female Panulirus homarus were 49,5 mm of carapace length. The length of first capture of male and female Panulirus homarus were 45,2 mm and 45,7 mm of carapace length. Berried female lobsters were found on each month of the study. Lobster fecundity ranged from 25.000 up to 151.000 eggs per female lobster. The peak of spawning season occurred on October.
Population Structure of Pacific Oyster (Crassostrea irredalei, Thunberg 1793) in Pabean Ilir, Indramayu
Pacific oyster (Crassostrea irredalei) belongs to the class Bivalvia or mollusk that was filter feeder characters. The oysters had been mostly consumed by the local community and serve as a livelihood. The purpose of the research was to analyze the population structure of pacific oysters in Pabaen Ilir, Indramayu. Oyster used in this researchedwas a catch result by self on researched location. It belongsused in this researchedwas a catch result by self on researched location belong April-August2016 and used a purposive sampling method combined with random sampling. Oyster catch during research was 1591 individual with 1156 individual of female and 435 individual of male. Oyster density on each month is lower into middle. Mean length of shell is about 70.24 mm. Population of oyster are decreased which marked many fishermen just caught smaller oyster.
Copyright (c) 2021 Habitus Aquatica : Journal of Aquatic Resources and Fisheries Management
Evaluation of Water Quality of Crown Golf Ornamental Lake, North Jakarta Based on N and P Content
Anthropogenic activity surrounds the Crown Golf ornamental lake may contribute to waste input that could lead to the increasing of nutrient concentration and affect nutrient enrichment in the lake. This research aims to evaluate the water quality of Crown Golf ornamental lake, Pantai Indah Kapuk, North Jakarta based on N and P content. Water sampling was conducted for a year (September 2018 to August 2019) at four sampling locations. The main observed parameters were N (total nitrogen, ammonia, nitrite, nitrate) and P (total phosphate, orthophosphate). The data were analyzed for comparison of observed water quality and standard (Government Decree of Indonesia Republic No 82 the Year 2001), determination of N/P ratio, and determination of pollution level determination using Water Quality Index (WQI) and Pollution Index (IP) based on N and P content. The nutrient concentrations (nitrite, nitrate, and orthophosphate) were lower in the rainy season than in the dry season, while ammonia, total nitrogen, and total phosphate were not different between both seasons. Generally, the water quality of Crown Golf ornamental lake was still meet the standard for recreational activity (Class II). However, the obtained N/P ratio was very high (51:1). The pollution level of this lake is also moderate to bad (based on WQI) and slightly polluted to highly polluted (based on PI). This revealed that the Crown Golf ornamental lake had quite high N and P concentration and potentially causing the decrease of water quality and ecological function.
Ichthyofauna of Lake Buaya, South Sulawesi
Lake Buaya is one of the lakes located in the central part of South Sulawesi. Information about ichthyofauna biodiversity in this lake does not yet exist. Therefore, this study was conducted to analyze species composition, relative abundance, diversity index, evenness index, and dominance index, fish caught in the waters of Lake Buaya. This research was conducted in March to May 2019. Sampling was carried out four times over two months using a fishing gear with a mesh size of 2 inches. Sample analysis was carried out at the Fisheries Biology Laboratory, Faculty of Marine Sciences and Fisheries, Hasanuddin University. During the study 328 fish were found that belong to 12 species and 9 families. The highest abundance of individuals and relative fish abundance was found in Trichopodus pectoralis (snakeskin gourami). The range of diversity index, evenness index, and dominance index were 2,11–2,35, 0,85–0,95, and 0,10–0,15, respectively.
Sediment Characteristics of Sei Carang Waters, Tanjungpinang City - Indonesia
Sei Carang has many open land areas and former bauxite. In addition, the condition of waters in Sei Carang can becomes turbid and turns yellowish brown when rains occur. Therefore, a study was conducted with the purpose of knowing the physical environment conditions of waters in Sei Carang waters with test parameters such as turbidity, current speed and knowing the characteristics of sediments in Sei Carang waters by using purposive sampling method. The purposive sampling method was applied to 4 research stations with the characteristics of station I in the bauxite mining area, station II in the open land area, station III in mangrove vegetation damaged by logging, and station IV on natural mangrove vegetation. The sedimentation characteristics in the water column is medium sand, while at the base of the water is coarse sand.
Fish Biodiversity of Seagrass Bed in Tanjung Tiram Waters, South Konawe, Southeast Sulawesi
Research on fish biodiversit yof seagrass bed has been carried out in Indonesian waters, and the results vary between water locations. This study aims to determine the biodiversity of fish based on seagrass density in the day and night period. This research was conducted in the waters of Tanjung Tiram, South Konawe from February to March 2018. Fish sampling based on seagrass density in the day and night period using gillnets with mesh size of 0.75, 1.25 and 1.50 inch. Fish biodiversity found in this study consisted of 42 species from 24 families with an abundance of 1000 individuals. Fish biodiversity in densely seagrass beds was higher than low seagrass beds.Labridae family was the most doimnan fish during the daytime while at night is dominated by the family Plotosidae. The status of fish biodiversity based on seagrass density was categorized as moderate to high and stable diversity while based on the day-night period was classified as moderate diversity with unstable to stable conditions, and the level of dominance of both was low.
Relationship Between Zooplankton Community with Water Quality in Ebony Lake, Pantai Indah Kapuk, North Jakarta
Ebony Lake is an ornamental lake, where its surrounding domestic activity which can produce waste that may affect water quality including organism in there, such as zooplankton. Ebony Lake has become the study object to see correlation between zooplankton community and water quality. This research had been done between April-August 2014 in 5 station every month. Zooplankton community in Ebony Lake consists of the phylum Rotifera, Crustacea, and Protozoa. The highest abundance of zooplankton is Brachionus from Rotifera. The phylum Rotifera has a strong negative correlation with TSS, turbidity, and ammonia, whilst it has strong positive correlation with acidity/pH. The high value of TSS, turbidity, and ammonia, followed by the low abundance of Rotifers; while low pH will be followed by high abundance of Rotifers. The phylum Protozoa has a strong positive correlation with TSS and negative with temperature.
Vulnerability of Fringescale Sardinella (Sardinella fimbriata) and Mackerel Tuna (Euthynnus affinis) in Sunda Strait
Fringescale sardinella (Sardinella fimbriata) and mackerel tuna (Euthynnus affinis) are two pelagic fish caught in Sunda Strait. Small pelagic groups are one of the fisheries resources that are under a lot of pressure due to exploitation activities. Overfishing conditions can result in vulnerability and disrupt the sustainability of resources. The aims of this study is to determine the level of vulnerability of fringescale sardinella and mackerel tuna. Secondary data collection was carried out from April to July 2015 at PPP Labuan Banten. Productivity and vulnerability analyzes were carried out using PSA (Productivity-Susceptibility Analysis) software. The vulnerability index values ​​of tembang and tuna fish were 1.03 and 1.00, respectively. This value shows that both fish into the criteria of being less vulnerable.