Jurnal Teknologi Perikanan dan Kelautan

ASSESSMENT OF THE FISHING TECHNIQUES IN BALI SARDINELLA FISHERY IN PENGAMBENGAN FISHING PORT, BALI, INDONESIA

Made Mahendra Jaya — 2025-05-04

Fisheries management with an ecosystem approach is essential to implement. This approach aims to achieve sustainability and balance in socio-economic, ecological, and more effective fisheries governance dimensions. The aspect assessed in this study was fishing techniques. The assessment was divided into six indicators: fishing methods, fishing capacity, selectivity of fishing gear, modification of fishing gear, suitability of fishing boat size and function, and certified fishing boat crew. This study aims to assess the status of Bali sardinella fishery resources in Bali Strait Waters, especially related to fishing techniques. We conducted research activities at Nusantara Fishing Port (PPN) Pengambengan from March to July 2023. Data collection used several methods, including interviews, surveys, and fish size sampling. The study results showed that the indicator of illegal or destructive fishing techniques or methods obtained a score of 3, and modification of the fishing gear used also received a score of 3. Fishing capacity, selectivity of fishing gear, and suitability of function and size of fishing boat used, based on legal documents, received a score of 3, 3, and 1, respectively. In contrast, certified fishing crews received a score of 1. Overall, the composite assessment in the fishing technique domain reached 90%, indicating that the Ecosystem Approach to Fisheries Management (EAFM) principles have been implemented well.

EVALUATION RESULTS OF NUSANTARA 5 AUTONOMOUS UNDERWATER VEHICLE (N5-AUV) IN A CONTROLLED ENVIRONMENT AND THE OPEN SEA

Muhammad Rafly Amanullah Fahmi — 2025-05-07

An Autonomous Underwater Vehicle (AUV) is a vehicle operated underwater using a propulsion system, controlled and navigated by a computer system, and capable of maneuvering in three dimensions. It is designed to perform tasks underwater that are difficult for humans to accomplish. This research aims to document the design and development of the Nusantara 5 AUV made by the MITR Club of Marine Science and Technology, Faculty of Fisheries and Marine Sciences, IPB University, as well as to evaluate its performance both in field conditions and controlled environments. The evaluation method for the vehicle involved comparing the movement results in water with the programmed motions of straight movement, turning, and gliding. The performance testing results indicated that the AUV could move straight with an average error of 2.8° in a controlled environment, while in the sea, the average error reached 5.4° because the AUV was tossed around by the sea waves. During turning maneuvers in controlled conditions, the AUV required 12.8 seconds to adjust its path after turning, whereas in the sea, it took 20 seconds. Gliding motion was still not perfect, both in the test pool and in the sea, as it tended to move up and down. This indicated a weakness in the Nusantara 5 AUV itself. However, the advantage of the Nusantara 5 AUV itself was in its smaller size compared to its predecessors and the use of fewer thrusters, thus minimizing manufacturing costs.

SUITABILITY AND CARRYING CAPACITY OF MANGROVE ECOTOURISM IN KAMPUNG NIPAH, SEI NAGALAWAN VILLAGE, NORTH SUMATRA

Nathania Sitompul — 2025-05-08

Mangrove ecosystems are highly vulnerable to damage, making their conservation crucial. The development of mangrove ecotourism serves as an approach to utilizing ecosystem services sustainably without causing harm. Ecotourism in mangrove ecosystems is beneficial as it synergizes with conservation efforts to protect the ecosystems. This study aims to assess the suitability and carrying capacity of mangrove ecotourism in Kampung Nipah, Sei Nagalawan Village of North Sumatra. The research was conducted in July 2023 within the mangrove ecotourism area of Kampung Nipah. The research location was selected using the purposive sampling method, consisting of three stations. Primary ecological data were collected through the transect method. The descriptive method was applied to analyze the tourism suitability index (TSI) and the spatial carrying capacity (SCC). The results indicate that the TSI values for the three substations were 1.97, 1.87, and 1.87 out of 3, while the SCC (carrying capacity) was 200 people per day. Based on these findings, the mangrove ecotourism area in Kampung Nipah, Sei Nagalawan Village, is conditionally suitable for tourism. The following recommendations can be implemented to expand the mangrove area to increase ecosystem thickness and maintain a visitor quota system to regulate tourist numbers and ensure sustainability.

ENVIRONMENTAL PARAMETERS AND COASTAL ECOTOURISM POTENTIAL OF AMBON BAY

Fredy Leiwakabessy — 2025-05-08

Ambon Bay is one of the waters in Maluku Province that has the potential for ecotourism, but the quality of the waters needs to be considered because over time it changes and experiences changes to the point of coastal damage from various natural events and human activities, especially on Wayame Village Beach, Galala Village Beach, and Passo Village Beach. This study aimed to determine the environmental parameters of Ambon Bay waters as an ecotourism area. This study measured salinity, pH, dissolved oxygen, temperature, and changes in the coastline using Sentinel 2 Imagery. The results of the study showed that the three locations had DO values of 2.8 mg/L, 3.1 mg/L, and 1.4 mg/L; salinity at 32 ppt, 34 ppt, and 33 ppt; pH ranging from 7.6 to 8.6; and temperatures ranging from 27°C to 29°C, and within a period of 4 years (2018-2022) there have been changes in the coastline. The results of the inventory found several tourist areas that can be revitalized and developed to help the economy of coastal communities. This research can be a reference for village communities and the government in making regulations and activities to prevent damage and handle it appropriately.

THE RELATIONSHIP BETWEEN CORAL REEFS AND COASTAL FISHERIES RESOURCES IN PANGGANG ISLAND AND SURROUNDING AREAS, SERIBU ISLANDS, JAKARTA

Hera Ledy Melindo — 2025-05-09

Panggang Island has the potential for a coral reef ecosystem covering an area of around 9 ha, but the existence of coral reefs in the waters of Panggang Island and its surroundings has decreased in area. This study aims to identify the condition of coral reefs and analyze the relationship between coral reefs and reef fish biomass in the waters of Panggang Island and its surroundings. Coral reef ecosystem data collection was carried out using the Line Intercept Transect (LIT) method, while fish data collection was carried out using the underwater visual census method. The condition of the coral reefs at the research location was classified as moderate. The highest live coral cover was recorded on Panggang Island with a value of 41% and on Air Island with a value of 31%. The coral reef growth forms (life forms) at both research locations were found to be 10 types, with the highest life forms being Coral foliose and Coral encrusting. The number of coral fish observed was 867 individuals from 106 species belonging to 27 families, dominated by the family Pomacentridae (72.81%). The abundance of fish on Air Island was 386±113 individuals/250 m², and on Panggang Island it was 406±160 individuals/250 m². The highest measurement results of coral fish biomass were at Station 4 of Panggang Island (43.05 g/m²), while the lowest one was at Station 3 of Air Island (4.98 g/m²).

EVALUATION OF NUSANTARA 3 REMOTELY OPERATED VEHICLE (N3-ROV) SPECIAL REPORT OF PERFORMANCE AND STABILITY IN VARIOUS WATER CONDITIONS

Xavercius Cezar Pratama — 2025-05-14

Vast marine resources require underwater observation and exploration, but conventional diving methods have many risks. Therefore, developing underwater technology such as Remotely Operated Underwater Vehicles (ROV) is essential to reduce the risk. However, the unpredictable underwater environment requires ROV performance testing before optimal use. Therefore, this study was conducted to test the performance of the N3-ROV, determine its specific specifications, and design a control system and video acquisition so that it can be an alternative for underwater observation and exploration. The N3-ROV has dimensions of 61x65x34 cm, a total weight of 13 kg, with a buoyancy of 128.4 kg.m/s², with surface control using a gamepad connected to a laptop. Performance tests were carried out in two different environments, a pool environment and a field environment. The N3-ROV has a straight movement in the pool environment with an error of 0° and in the field environment of 1.7° with speeds of 76.6 cm/s and 77.2 cm/s, respectively. The descent motion in both environments is different, where in the pool environment, the descent motion has a delay and error of 9.7 seconds and 94.1°, respectively, compared to the field environment of 3.9 seconds and 48.8°. The delay and error in the turning motion in the pool environment are higher than in the sea environment. The gliding motion in the pool environment has a slower surfacing speed compared to the field environment.

STRATEGY FOR DEVELOPING BLUE ECONOMIC POTENTIAL THROUGH SUSTAINABLE TOURISM IN THE COASTAL AREA OF SEMARANG CITY

Iwan Fadli Pasaribu — 2025-05-16

Semarang City, the capital city of Central Java Province, holds significant potential for marine tourism developments due to its strategic location and various tourist destinations. However, this sector faces challenges in facilities, promotion, and management. This study was conducted from March to June 2024, and aims to analyze the potential for implementing a blue economy to support the development of marine tourism and contribute to formulating a blue economy-based strategy to support the development of sustainable marine tourism in Semarang City. The qualitative descriptive method with a case study approach applied data collection through interviews, observations, and literature reviews. Identification was carried out using a SWOT analysis to identify strengths, such as strategic location and diversity of destinations, as well as weaknesses in the form of limited facilities. Opportunities included the development of tourism packages and cultural events, while threats included environmental degradation and tidal flooding. Implementing a blue economy strategy can enhance marine tourism by improving promotional strategies, developing cultural and tourism events, and boosting conservation efforts, supported by improved management of facilities and infrastructure.

IDENTIFICATION AND PREVALENCE OF ECTOPARASITES IN BLUE SWIMMING CRAB (Portunus pelagicus Linnaeus, 1758) ON THE NORTH COAST OF JAVA

Adela Shofirma — 2025-05-16

Besides overfishing, other factors that influence the decline in blue swimming crab (Portunus pelagicus) production are diseases caused by parasites. Poor environmental conditions could trigger parasite infestation on their host. This study aims to identify ectoparasites morphologically based on the research location and to analyze the prevalence of ectoparasites of the blue swimming crabs. Crab samples and data collection of aquatic environmental parameters were carried out at five locations in the northern part of Java Island, Indonesia: Pasuruan, Lamongan, Semarang, Cirebon, and Banten. The study was conducted from December 2021 to July 2023. Morphological identification of ectoparasites was carried out at the Biology Micro Laboratory I, Department of Aquatic Resources Management, IPB University. Interviews with fishermen were also conducted to ensure the crab catchment area around the research location. The number of blue swimming crabs obtained at each location varied, ranging from 25 to 35 individuals, consisting of large, medium, and small crabs. Based on the results of morphological identification, there were a total of five types of parasites found in all research locations, namely Allokepon sp., Chelonibia testudinaria, Octolasmis angulata, Octolasmis warwickii, and Octolasmis sp. The prevalence rate of crabs in each location was significantly different in five locations, namely Pasuruan, Lamongan, Semarang, Cirebon, and Banten, which were 80%, 74%, 80%, 12%, and 70%, respectively. The highest prevalence was in Pasuruan and Semarang. Factors affecting the prevalence rate of ectoparasites in blue swimming crabs included environmental quality such as temperature, salinity, pH, and dissolved oxygen (DO).

CONNECTIVITY OF BIVALVES BETWEEN MANGROVE AND SEAGRASS ECOSYSTEMS IN KELAPA DUA ISLANDS

Endang Sunarwati Srimariana — 2025-05-18

Kelapa Dua Island, part of the Seribu Islands, is rich in biodiversity within the mangrove and seagrass ecosystems. Bivalves serve as bioindicators, crucial for assessing the health of these ecosystems. This study aimed to analyze differences in bivalve diversity between mangrove and seagrass environments and examine their associations between and within these habitats. Data were collected through mangrove and seagrass density surveys, water quality measurements, and sediment analysis. Line transect and plot methods were used for mangrove observation, while the Seagrass Watch method was applied for seagrass observation. Bivalve samples were collected using PVC pipes (up to a depth of 10 cm) for subsurface individuals and visual surveys for exposed species. The island’s sandy substrate supported a variety of bivalve species. Fifteen bivalve species from six families were identified: Tellinidae, Cardiidae, Veneridae, Lucinidae, Donacidae, and Pinnidae. Bivalve density was significantly higher in the seagrass ecosystem (1,029 ind./100 m²) compared to the mangrove ecosystem (366 ind./100 m²), with the family Tellinidae showing the highest density (664 ind./100 m²). Ecological indices indicated stable conditions, with a diverse and evenly distributed bivalve community, reflecting a healthy environment. Correspondence analysis revealed that bivalve species were more concentrated in stations representing seagrass ecosystems, highlighting a stronger association with seagrass habitats.

ADDITION OF PHYTASE IN ARTIFICIAL FEED GIVEN TO GIANT GOURAMI FISH FRY (Osphronemus goramy)

Andi Nikhlani — 2025-05-20

Efficient feed is very important to understand the quality and quantity of feed concerning fish growth, if the fish consumes feed with the proper nutritional requirements for the fish's body needs. The amount of nutrients used by the fish's body will be minimal. One of the common problems in the process of making artificial feed is the use of vegetable protein in suboptimal feed due to the presence of anti-nutritional factors called phytic acid, which can reduce the amount of nutrients such as protein and minerals, and will affect the growth of the organism. This study aims to analyze the transformation and efficiency of feed in giant gourami fish fry by adding phytase enzymes to artificial feed. The data collected were displayed in tables and bar charts and analyzed using descriptive methods. The findings of the study stated that the addition of 3 mg/kg phytase to the feed produced better results than the control and other phytase doses (1 g/kg feed and 2 g/kg feed) in terms of feed conversion (1.02), feed utilization efficiency (97.77%), increased in total length (7.22 cm), and increased in absolute weight of giant gourami fish fry (197.44 g). During the study, water quality was measured at a temperature of 27-28°C, pH 6-7.3, oxygen levels of 4.8-6.3 mg/L, and ammonia levels of 0.02-0.08 mg/L.