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Collecting Clarias fry from natural waters

Programme for the Development of Pond Management Techniques and Disease Control

Year of publication 1981

Pages p.6

Author Montree Muangboon;Fisheries and Aquaculture Management Division

Product type Project

Edition 1

Synopsis (short abstract) In order to provide seed fish for emerging Clarias culture, the Thai Department of Fisheries implemented a public program for collecting fry from the wild. Methods for collecting the fry were demonstrated by government fisheries officers. Collected fry were purchased by the Bangkhen Fisheries Station. Some were re-distributed to fish farmers while some were first reared to a 3 to 5 cm size before being passed on. About 180,000 and 3,000,000 fry were produced by this program in 1959 and 1960, res pectively. 1 This working paper is a translated version of a report which appears in the Thai Fisheries Gazette, 14(2):105–111(1961). A first draft in English was prepared by Tawan Chookajorn, fisheries biologist, National Inland Fisheries Institute, Bangkhen, Bangkok. The version presented here was developed by Dr. Alex Fedoruk, Senior Fisheries Biologist with DoF-UNDP/FAO project THA/75/012 in Thailand, from the draft and discussion with Thai fisheries workers. Transferring information by th is means is subject to the limitations inherent in relaying from one language to another. Shortfalls in the information presented may thus be a reflection of communication rather than of source. 2 Formerly, fisheries biologist, Bangkhen Fisheries Station, Bangkok, Thailand. Presently, Provicial Fisheries Officer, Singburi Province, Thailand.

Cite this content as:

Muangboon, M. 1981. Collecting Clarias fry from natural waters. Bangkok (Thailand). 6 p

Language English

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    Bioled rice bran, Moina sp., boiled tilapia flesh, fresh chub mackerel viscera and fresh pig blood were tested as feeds for raising fry of pla duk dan (Clarias batrachus). The fry, averaging 0.233 to 0.316 g, were reared in pottery water jars containing 5 l of water that was exchanged every two days. The feeds were applied at the rate of 5% of the body weight of the fry/day. At the end of the 65 day trials the best growth gains, ranging from 0.51 to 0.82 grams/fish, were attained with the Moin a, tilapia and mackerel feeds. Average weight gains with the rice bran and pig blood feeds were 0.35 and 0.38 grams/fish, respectively. Survival was relatively high in all cases, ranging from 71 to 92%. The highest net production in each trial was with mackerel feed, being the equivalent of 10.6 kg/m3 in trial No.1 and 6.5 kg/m3 in trial No.2; the corresponding values for tilapia feed were 8.1 and 6.0 kg/m3 while net production on Moina feed in trial No.1 only was 9.9 kg/m3. Reasons to account for differences in growth and production results for the same treatment, between trials, were not evident.
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    Assessment of a vitamin and mineral premix in an artificial feed for pla duk oui (Clarias macrocephalus) fry
    Programme for the Development of Pond Management Techniques and Disease Control
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    Clarias macrocephalus fry were reared on two artificial feeds, one with a vitamin and mineral premix and the other without. The fry, 15 day old fish averaging 0.2 grams each, were stocked at the density of 1,000/m2 in fibre glass tanks and were fed at the presumed rate of 5% of their body weight/day. At termination of the trials (33 days) survival in lots fed on food with the premix was 79% and the average size of the fish was 0.65 g. Survival in the opposing treatment was 35.18% and the avera ge size of the fish was 0.48 g. Cost estimates indicated that the diet with the premix could be prepared for about 10ß (US$0.50)/kg and that 1ß (US$0.05) worth of feed would be required to feed 100 fry for 30 days.
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