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No Thumbnail AvailableProjectSouth China sea fisheries development and coordinating programme. Preliminary fish seed resources survey along the coast of Peninsular Malaysia 1978
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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. -
ProjectAccidental death and destruction in artisanal canoes: a retrospective study of the years 1989-1991 along the coast of Guinea (Conakry) West Africa 1994
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Fishing is well known to be a dangerous occupation, but little hard information has been gathered on the hazards of the artisanal canoe sector in West Africa. This report presents the results of a retrospective sea safety survey in Guinea, which covered the years 1989 - 1991. The investigation, commissiormed by the Guinean national working group on artisanal safety at sea and executed with technical assistance from IDAF, used a specially adapted accident case study questionnaire to gather info rmation for the relevant period from over 80 % of the marine artisanal sector in Guinea.At a national level, 225 major canoe accidents were documented in the study, revealing a three year death toll of 110 persons, 68 reported injuries, and equipment losses corresponding to US $ 285,000. For reasons explained in the text, the number of death is thought to be considerably under reported. The fatalities are about evenly divided between fishing boats and transport canoes. The calculated death rat e, all types of canoes combined, corresponds to 0,5 % of the 6894 registered fishermen dying each year in accidents at sea.Suggestions are presented with respect to national authorities undertaking similar analyses of their artisanal sea safety situation on an annual basis.
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