Olah, J. Nov 1983. A programme of investigations on the hydrobiology of fish ponds, India. 47 p.
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No Thumbnail AvailableProjectInvestigations in freshwater fish culture, India 1985
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No results found.This report was prepared during the course of the project identified on the title page. The conclusions and recommendations given in the report are those considered appropriate at the time of its preparation. They may be modified in the light of further knowledge gained at subsequent stages of the project. The designations employed and the presentation of the material in this document do not imply the expression of any opinion whatsoever on the part of the United Nations or the Food and Agricu lture Organization of the United Nations concerning the legal or constitutional status of any country, territory or sea area, or concerning the delimitation of frontiers. -
No Thumbnail AvailableProjectWater quality conditions as disease related stressors in Clarias pond culture
Programme for the Development of Pond Management Techniques and Disease Control
1981Also available in:
No results found.Quality characteristics of water in two Clarias culture ponds were monitored through a grow-out cycle then assessed as stressors relating to disease and mortality. The two ponds were part of a small-scale commercial fish farm growing Clarias and Ophicephalus. The culture system was representative of the Clarias practice in Thailand where distressed fish and relatively high mortalities are typical. The two Clarias ponds, about 1,000 m2 each, were stocked with 0.6 g. fingerlings at the rate of 7 7 and 78/m2 on March 1, 1980. The fish were fed a mixture of ground trash fish and rice bran (9:1) then harvested after 5 months giving yields of 3,931 (3.73 kg/m2) and 5,088 kg (5.3 kg/m2) from pond No. 1 and pond No, 2, respectively. Correspondingly, average weights of harvested fish were 122 and 144 g, food conversion ratios were 6.4 and 4.9, and survival rates were 40.3 and 47.4%. Two incidences of relatively high mortalities were observed at the same time in each pond; the first occurred 49 to 53 days after stocking and the second was during the period 120 to 150 days after stocking. Pathological examination of the distressed and dead fish revealed that they were highly infested with Aeromonas sp. bacteria. Water conditions in the ponds were characterized by low Secchi disc transparency (av. 9 and 10 cm. through the grow-out period), very little DO (av. late afternoon values over the last 3 months of 0.8 and 1.3 mg/1), generally high CO2 values (in excess of 20 mg/1 through abou t 60 days of the cycle), high BOD (av2. 8.5 and 8.8 g O2/m3/day), and high un-ionized ammonia (2.2 and 3.0 mg/1, av. through the first 60 days). -
No Thumbnail AvailableProjectA programme of bioeconomic modelling on freshwater fish culture in India 1984
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No results found.The order of the items of the terms of reference was changed, as the consultant considered it necessary to give some training in modelling techniques before a meaningful discussion on their usefulness could be initiated. And, before an evaluation of available data and advice on future data collection can be given, some outline of the purpose of data collection must be available, i.e., one must have some idea of which type of parameters in which type of model one wishes to estimate before an eval uation of data can be carried out. Thus, the order of the following sections 4.1 to 4.6 indicates the chronological order of the development. Lecture notes containing the essential parts of the training programme were prepared and 17 copies were made available to the staff.
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