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No Thumbnail AvailableProjectGiant freshwater prawn farming in Supanburi, Thailand 1979
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No results found.Amongst all the Thai people who earn their living from rearing aquatic animals, to be able to culture freshwater prawns has been a long present hope. The obstacle that impedes business development in this field is a lack of technical understanding; there is, for instance a belief that: cannibalism during pond rearing will cause low yields prawns will not grow in ponds prawns will not have a chance to grow because predatory fish and other predators will attack them in the early stages of re aring. However, the development of prawn culture is greatly and genuinely handicapped by lack of experience and the difficulties in obtaining sufficient juveniles and mature prawns for culture purposes from their natural breeding grounds. Recently, the Department of Fisheries of the Royal Thai Government established a programme to determine the necessary data for producing juvenile prawns under controlled conditions. The Chacheongsao Fisheries Station is one of the stations conducting these experiments. During 1977, freshwater prawns were hatched and reared there so that some juvenile prawns could be stocked in private ponds in some 23 provinces in order to collect and study data on growth and survival rates. Supanburi is one of the provinces where many inhabitants are extremely interested in freshwater prawn culture. Some already had experience in fish culture, which is considered advantageous for those wishing to culture prawns. Being a new enterprise in its infancy there is a co nsiderable amount of work yet to be done to bring prawn culture to full maturity. However, the successful result obtained by the culturists of this province may serve as a guide for those who are interested and at the same time serve as a basis for promoting deeper interest amongst them. It is hoped that these annotated results will encourage them to devote themselves to prawn culture without hesitation. -
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 handbook of diseases of cultured Clarias (Pla Duk) in Thailand
Programme for the Development of Pond Management Techniques and Disease Control
1981Also available in:
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