Search

Feed residues and fish waste from floating net cage activities in Kedung Ombo Reservoir are the main issues in decreasing water quality, impacting the abundance of phytoplankton as primary producers. This study aimed to evaluate the relationship of nutrients and turbidity with phytoplankton abundance. This study used a field survey method with a purposive sampling technique. Samples were collected 3 times at intervals of 1 month at 3 different stations. Samples of water and phytoplankton were taken on the surface. Data analysis using multiple linear regression. The results showed that the nitrate concentration was 0.2–0.7 mg/L; phosphate 0.1–0.87 mg/L; and turbidity of 3.52–20.18 NTU. The phytoplankton abundance was 17,882–90,280 cells/L with a low diversity index (1.127–1.849), a high uniformity index (0.406–0.701), and a low dominance index (0.243–0.557). There is a strong correlation between nutrients, turbidity, and phytoplankton abundance, with a value of r = 0.800. The coefficient of determination (R2) = 0.640 indicates that phytoplankton abundance is influenced by nutrients and turbidity by 64%, while other factors influence the remaining 36%. [ABSTRACT FROM AUTHOR]

A lot of fish waste is produced by the community, both from the marketing sector and the fisheries sector, which is caught by fishermen. Almost 35% of the fish waste produced is in the form of heads, bones, innards and also fish remains that are not the main catch which are thrown away directly. Vermicomposting is one of method to reduce the amount of fish waste. The adding of livestock manure in vermicomposting will increase the quality of compost. The purpose of this research is to analyze the compost quality with the mixture of fish waste and livestock manure. The results showed that The compost that has the best quality based on SNI 19-7030-2004 is B2 with 45% fish waste, 20% cow dung and 35% sawdust with a dose of EM4 10 ml, which has a final temperature of 29ºC, pH 7, water content 41%, C-organic 19.83%, nitrogen 1.34%, phosphorus 0.36%, potassium 1.15%, and C/N ratio 14.85. Then, after incubating the soil improvement, it was found that the addition of compost can improve the chemical characteristics of the soil according to the dose given. This indicates that compost application can affect soil quality. Soil quality that has C-organic and nitrogen content according to BPT in 2009 is with the addition of a dose of 5.2 grams of vermicompost. The shortcomings of this study are that the phosphorus and potassium levels are too high.

The Environmental Service Surabaya noted that waste generation at Benowo Landfill reached 1,600 tons/day. 60% of waste generation at Benowo Landfill was dominated by organic waste. One of organic waste was fish waste, vegetable waste, and some waste from household business activities such as sawdust. One of method composting to reduce organic waste is vermicomposting. Lumbricus rubellus is a type of worm that eats leaf litter so, it is suitable to be used decompose organic waste. The adding of EM4 solution can make more fast of composting process. The compost could be applied in regosol soil to improve soil CNPK quality. The purpose of this study was to analyze the effect of EM4 variations on the quality of compost based on SNI 19-7030-2004 and the effect of adding the compost to regosol soil. The research result showed that the quality of compost complies with SNI 19-7030-2004. The statistical analysis showed that EM4 has a significantly effect on compost quality and regosol soil improvement.

The productivity of purple eggplant has decreased and consumption continues to increase, it is necessary to increase the productivity of purple eggplant. Increasing productivity can be done by applying liquid organic fertilizer (LOF) derived from organic waste such as banana peels and fish waste. The purpose of this study was to determine the type and concentration of LOF that can help the growth and yield of purple eggplant. This research was conducted on the land of the Faculty of Agriculture, University of National Development (UPN) "Veteran" East Java in March to July 2022. The study used a factorial Randomized Block Design (RBD) consisting of 2 factors. The first factor was the LOF of banana peels and LOF of fish waste. The second factor is the LOF concentration level, namely 10%, 15%, 20%, 25% and 30%. The results showed that the treatment combination of fish waste LOF with a concentration of 30% gave plant with a biggest stem diameter of 1.01 cm. While the treatment combination of fish waste LOF with a concentration of 25% gave results with a total of 16.78 flowers and a total fruit weight of 1435.61 g/plant.

Biotransformation of fish waste as feed matter for ruminant ABSTRACT. Fish waste (head, viscera and tails) which ensilage with saccharomyces sp and lactobacillus sp, had a high quality and protein content of about 53,18 ± 0,83% and a good aroma. An experiment have been conducted by experimental method with in sacco trial and in vivo trial. The treatment tested were 4 kind of protein source : (1) fish waste silages mixed with tapioca ; (2) fish waste silages mixed with rice bran ; (3) soy bean kernels and (4) fish meal. The in sacco trial was carried out on 3 fistulated cows, to study the rate of protein degradability in the rumen. The in vivo trial was carried out by Completely Randomized Design on 16 heads of fat tail rams. The variable measured were: rumen fermentation product (VFA and N-NH3); energy and protein digestibility; daily body weight gain of the rams. The experiment showed, that the source of protein use have no significantly effect upon VFA both on the VFA total and individual VFA (acetate, propionate and butyrate). The highest propionate reach by soya bean kernels (P 0.01). Based on the all variables measured, it was indicated the silage of fish waste can be used to substituted of soya bean kernels or fish meal in the ration of sheep.