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Book (stand-alone)Fish silage production by fermentation
A manual on how microbial fermentation can turn fish waste into a valuable feed ingredient or fertilizer
2024Also available in:
No results found.This publication is a practical manual that will guide the reader through the main principles of producing fish silage by fermentation and explain each step of the fermentation process needed to successfully become a fish silage producer. Fish, including shellfish, are highly nutritious and in much demand all over the world. However, fish processing by-products, in particular viscera (guts), are highly perishable. If not preserved or processed within a relatively short time after harvest, they may deteriorate rapidly making them unfit for human consumption or other uses. In many cases, processing leads to the removal of significant parts of the fish, such as the viscera, head, belly flaps and backbone. Depending on the species, these parts may represent between 30 percent and 70 percent of the fish. Some parts, such as gonads, belly flaps and backbones, may be used directly for human consumption, but most of the by-products of fish processing have traditionally been wasted, leading to negative environmental impacts, or they have been used in fresh form as feed for livestock or as fertilizers. -
No Thumbnail AvailableProjectStudies on the effects of fresh and fermented manure on fish production
Establishment of a Network of Aquaculture Centres in Asia
1987Also available in:
No results found.With chemical fertilizer (N,P) as control, comparative studies were made on the effects of fresh and fermented pig manure on fish production. The results indicated that fish production in ponds supplied with fresh pig manure was the highest, compared to those with fermented pig manure, or control ponds. It appeared that fish in fresh pig-manured ponds not only could utilize bacteria, detritus and plankton, but could also directly feed on pig manure; thus pig manure was utilized better and result ed in higher fish production. -
No Thumbnail AvailableProjectPreliminary studies on the effects of fresh and fermented pig manure on fish production
Network of Aquaculture Centres in Asia
1988Also available in:
No results found.The growth of several cultivated fishes of Cyprinidae was studied using cognate fresh and fermented pig manure and the equivalent fertilizers N and P as sole inputs to different experimental groups of fish ponds. Experiment I was conducted from June to October 1986, experiment II from March to October 1987. The proportions of fish production from chemical-fertilized ponds (C), fermented pig manured ponds (F1), and fresh pig manured ponds (F2) were 100:156:226 and 100:294:382 respectively. The ratio of fish production of F1 ponds to F2 ponds was 100 to 145 in experiment I and 100 to 130 in experiment II, respectively.The chlorophyl content, zooplankton biomass, bacterial activity and BOD were lower in the C ponds than in the F1 and F2 ponds, while the DO concentration was higher. There was little difference in the concentration of NH4-N and PO4-P among the experimental ponds. The physico-chemical parameters in the F1 and F2 ponds were not always in conformity with the fish production. Some parameters were contradictory in these two experiments. In the experiment I, the content of NH4-N in the F1 ponds was lower than that in the F2 ponds, and the content of chlorophyl and the biomass of zooplankton in the F1 ponds were greater than those in the F2 ponds. In contrast, in experiment II all these three parameters were reversed in the F1 and F2 ponds. These results indicate that part of the fish production in the C ponds came from the natural planktonic food chain, while in the F1 and F2 ponds, much of the production was derived from the manure detritus as well as from the planktonic food chain. The nutrient value of fermented pig manure is probably less than that of fresh manure because of bacterial decomposition during fermentation. There is a complicated relationship among various physico-chemical factors after manure application in the F1 and F2 ponds.
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