Habitus Aquatica

Phytoplankton community structure in Palabuhanratu Bay

2024-02-27T11:05:57+07:00

Phytoplankton, as autotrophic organisms, play a role as primary producers and are often used to measure the fertility of a body of water. Palabuhanratu Waters, which has fishing resources, experiences various human activities in its vicinity. This study aims to determine the community structure in Palabuhanratu Waters. Phytoplankton samples were collected in October 2022 from four stations, and water parameters such as temperature, salinity, pH, and dissolved oxygen (DO) were measured. Six classes and 27 genera of phytoplankton were found, including Dinophyceae, Bacillariophyceae, Oligotrichea, Chlorophyceae, Polycystina, and Trebouxiophyceae, with Bacillariophyceae being the dominant class. The abundance of phytoplankton was relatively low, ranging from 66 to 695 ind/l. The diversity index was classified as moderate, with values ranging from 1,552 to 2,234. The water parameters indicated that the conditions still support the growth of phytoplankton.

Types and abundance of microplastics in red snapper (Lutjanus malabaricus) in Kupang Bay Waters, East Nusa Tenggara Timur

2024-02-27T11:06:27+07:00

Microplastics are plastic particles that have a size of <5 mm. Its small size means it can be transported to all waters and biota, including fish. Sources of microplastic waste in waters include industry, agriculture and anthropogenic activities, all of which can be a source of microplastic pollution in the sea. Red Snapper (Lutjanus malabaricus) is a type of demersal fish that lives in groups at the bottom of coral or coral reefs. Red Snapper is a category of fishery products that has important economic value and is in great demand by the public. This research aims to identify the type, color, abundance and size of microplastics in Red Snapper fish. Sampling was carried out in September-October 2022 with a total of 50 fish samples studied. Identification of microplastics based on the shape, size and color of the microplastic particles. The results of the research found as many as 1,593 microplastic particles in the Red Snapper fish samples consisting of fibers, fragments, films and granules. The highest abundance of microplastics was dominated by the fiber type, namely 17.98 particles/individual in the gills and 11.66 particles/individual in the intestine. The lowest abundance of microplastics overall was in the gills with the film type being 0.28 particles/individual and the granule type being found at 0.3 particles/individual. The colors of microplastics found were white, black, red, yellow, blue, transparent and green. The highest color of microplastics found overall was dominated by white, both in the gills (52.45%) and in the intestines (48.74%), while the lowest was green which was found in the gills (0.42%) and in the intestines. intestine (0.79%). The microplastics found varied in size, namely <0.25 mm - >2 mm. The microplastics found in the two fish organs were mostly 0.50 mm - 2 mm in size. Very few microplastics measuring <0.25 mm were found, both in the intestines and gills.

The effectiveness of Ipomoea reptans and Brassica rapa as phytoremediation on the growth and survival of sangkuriang catfish (Clarias gariepinus) in aquaponic cultivation systems

2024-02-27T11:06:34+07:00

Sangkuriang catfish (Clarias gariepinus) is the result of a marriage between an F2 female African catfish and an F6 male. Decreased water quality can affect the growth and survival of sangkuriang catfish (C. gariepinus). One way to prevent the decline in water quality is by phytoremediation using aquaponic cultivation techniques. This research aims to determine the effectiveness of phytoremediation on the growth and survival of sangkuriang catfish (C. gariepinus) in aquaponic cultivation systems. The method used was the experimental method, Completely Randomized Design (CRD) with 3 treatments, namely; A (control), B (Ipomoea reptans), and C (Brassica rapa). Data analysis used SPSS ver 29 which included Anova and Kruskal Wallis tests which aimed to compare whether there were differences in the growth of Sangkuriang catfish (C. gariepinus) between treatments, and a correlation test which aimed to determine the relationship between water quality and the survival and growth of Sangkuriang catfish (C. gariepinus). The results of descriptive analysis show that the use of phytoremediation is effective on the growth and survival of sangkuriang catfish (Clarias gariepinus) with ideal environmental parameters. Although the growth in length and weight of Sangkuriang catfish (C. gariepinus) and survival did not differ significantly between treatments, the highest growth was obtained in the kale (I. reptans) treatment, and the highest survival of Sangkuriang catfish (C. gariepinus) was obtained in Pakcoy (B. rapa) treatment. This means that the use of phytoremediation is effective in supporting the growth and survival of Sangkuriang catfish in aquaponic cultivation systems.

Biological aspects of spiny rock crab, Thalamita crenata in Kolono Bay, South Konawe, Southeast Sulawesi

2024-02-27T11:06:30+07:00

The aim of this study was to determine the relationship carapace width and body weight, condition factor, sex ratio, stage of gonad maturity, first sizesexual maturity, and fecundity in the Kolono Bay. Crab samples were obtained using folding trap fishing gear. The resultas of this study were that distribution of carapace width and body weight of male and ovigerou female T. crenata tended to be greater than that of females. While thecarapace width and body weight of female T. crenata tended to be smaller than body size of thecorrelation between carapace width and body weight of T. crenatashows a very shows a strong andpositive relationship with negative allometric growth patterns. . Male condition factors were significantlydifferent (p <0.05) from ovigerous females and females. Male and female condition factors weresignificantly different (p <0.05) indicating that the male was greater than the female. Overall sex ratiowas significantly different (p <0.05) from the 1: 1 ratio, except in the period July and August. Gonadmaturity stages based on sex and ovigerous females were found to vary during research but weredominated by the mature of gonads. The carapace width of the first sexual maturity this crab, male and female, were 55.39mm and 49.53 mm, respectively with fecundity ranged from 32.741 to 257.798.

Spatial variability of the characteristics of coral coverage in the waters of North Seribu Islands district, DKI Jakarta

2024-02-27T11:06:21+07:00

Coral reefs take a long time to recover and prone to damage. This study aims to analyze the spatial variability of coral reef coverage based on different utilization categories in the Waters of the North Seribu Islands District. This study was conducted in North Seribu Islands District that divided into six sampling points in August 2022. The coral coverage data collection was estimated using the Line Intercept Transect method, the water quality samples taken were brightness, nitrate, dissolved oxygen, pH, and salinity. Different utilization categories between sampling stations have no significant effect on coral cover percentage, except for protected categorized station. The main cause affecting the coral coverage is suspected to be due to physical damage caused by direct impacts from human activities, such as fishing, tourism, and transportation activities. The highest coral coverage in the good category was in the Marine Protected Area, while the lowest coral coverage in the damaged category was in West Pramuka Island as the location most affected by human activities.