Asian Journal of Fisheries and Aquatic Research

The Cisayong area of ​​Tasikmalaya Regency is an area that is passed by the Citanduy River. The condition of the waters in the Citanduy River in Cisayong area, has received various waste inputs which will affect the quality of the river waters and cause a decrease in water fertility. Plankton can be used as an indicator of water fertility. This study aims to determine the spatial distribution of plankton in the Citanduy River, Cisayong Tasikmalaya Region, West Java. This research was conducted from January 2020 to February 2020. The research stations are located in four locations which are determined based on environmental and land use factors with a sampling period span of once every seven days. This research was conducted using a survey method and the data were analyzed descriptively and comparatively. The results showed that there were 67 genera of plankton from 5 phytoplankton phyla and 4 zooplankton phyla with most of the phytoplankton groups found from the Bacillariophyceae class and the zooplankton group from the Tubulinea class. The total average abundance of phytoplankton was 11,534 ind / L and the total average abundance of zooplankton was 295 ind / L. The biological index values ​​of the average diversity and dominance of phytoplankton were 2.72 and 0.11, while the average values ​​of diversity and dominance of zooplankton were 0.92 and 0.47. The results of the plankton spatial distribution show that the fertility of the waters in Citanduy River is classified as oligotrophic for station 1 and mesotrophic waters for stations 2,3, and 4.

Fisheries is one of the sectors that can be developed to meet world food needs. The development of the fisheries is influenced by the availability of quality feeds. Dunaliella salina is a unicellular green algae that can be used as fish feeds. D. salina is known to contain many nutrients such as protein, carbohydrates, fats, pigments, and others. D. salina has also been shown to increase the growth rate of various types of fish. Not only for growth, but several studies have shown that D. salina has favorable effects on immunology. This article aims to explain the nutritional content and the effect of D. salina on the growth and health of fish. Based on the above studies, D. salina has the potential to be used as an alternative feed for various types of fish.

The experiment was conducted to evaluate the production performance of freshwater mud eel (Monopterus cuchia) with supplementary feed for a period of 5 months in field level. Two ponds were selected for this experiment in Maulovibazar district. Baby cuchia having weight of 50-70 g were stocked in ponds at a stocking density of 10/m² in filter net. Liming (CaO) was done in all the ponds at rate of 250 kg/ha. A safety shelter for cuchia was developed by installing bamboo root, plastic and bamboo-made hollow pipe, aquatic vegetation and necessary objects in the pond. Different physico-chemical parameters were found to be within the acceptable ranges for M. cuchia culture in all ponds. Supplementary feed composed of fish paste (50%), fish meal (40%), rice bran (5%) and wheat flour (5%) was applied at the rate of 2-3% of body weight. After 5 months of rearing, total production obtained were 28.3±1.09 and 31.9±2.56 kg from pond-1 and pond-2, respectively. The highest production was obtained from pond-2 and lowest production was obtained in pond-1. The net profit gained from pond-1 and pond-2 were tk 2559 and 3211 per decimal, respectively.

This research was held in Sindangkerta Village and Sindangkerta Marine Wildlife Reserve, Sindangkerta Village, Cipatujah District, Tasikmalaya Regency, West Java Province. The implementation started in October 2019 until June 2020. The research aims to analyze the  social and economic aspects of Sindangkerta Marine Tourism Object for the local neighborhood and to analyze the development strategy of the Sindangkerta marine conservation area. The research employed case study method in  Sindangkerta Marine Wildlife Reserve by collecting primary and secondary data. Furthermore, the collected data processed with puposive sampling method via Microsoft Office Excel with SWOT (Strengths, Weaknesses, Opportunities, and Threats) analysis. The research resulted the villagers hasn’t been implemented the current system, according to the entire villagers they hope that the Sindangkerta Marine Wildlife Reserve Area potential can be further developed in order to provide more benefits for them. The best strategy for Sindangkerta Marine Wildlife Reserve development using SWOT Analysis in Quadrant I, by applying SO or an aggressive growth strategy with a coordinate point of 0.02; 1.10 means utilizing the strength to exploit the existed opportunities.

The blue tilapia, Oreochromis aureus is an invasive species that has successfully established itself in most of the Iraqi waters. However, there is little information on the population dynamics of the species in these waters. Hence, the growth parameters, mortality rates, probability of capture, recruitment pattern and yield per recruit of blue tilapia in Garmat Ali River, Iraq was assessed using FiSAT II software. A total of 1664 blue tilapia fish were collected by different fishing gears from October 2019 to September 2020 for recording the relevant data. The length-weight relationship obtained was W=0.0147*L^3.0748 for fish ranging from 7.5 to 26.3 cm total length suggesting that the species shows positive allometric growth. The asymptotic length (L∞), growth constant (K), theoretical age at zero-length (t₀), growth performance index (Ø') and longevity (t_max) were 29.9 cm, 0.205, -1.293, 2.345 and 10.7 years, respectively. The total mortality (Z), natural (M), fishing (F) and exploitation (E) were 1.09, 0.61, 0.48 and 0.43, respectively. Length at first capture (L₅₀) was found to be 13.92 cm. The main recruitment pulse was from March to July with a peak in April, which account for 18.4% of the total recruitment in the year. The relative yield per recruit analysis revealed that the present exploitation rate (E_present) for blue tilapia was below than the biological target reference points (E_0.1 and E_max), which denotes that this stock was not over-exploited. For management purposes, higher yields can be achieved by reducing the mesh sizes of the nets during fishing.