Larval rearing of the Asian Catfish, Pangasius bocourti (Siluroidei, Pangasiidae) : alternative feeds and weaning time
2002
Le Thanh, Hung | Nguyen Anh Tuan, | Cacot, Philippe | Lazard, Jérôme
Three experiments were carried out to evaluate Pangasius bocourti larval rearing with different feeding regimes. In the first experiment, survival rates of larvae fed on Artemia nauplii, cladocereans (Moina sp.), or red-blood worms (Tubifex) were not significantly different, 91-93%. However, Artemia nauplii and Tubifex gave similar growth rates (35-36% day - 1) while Moina sp. resulted in lower growth. Commercial trout-starter feed resulted in the lowest survival (67%) and growth rates (20% day - 1) when compared to live feed. In the second experiment, feeding dry feed based on yeast and beef liver or feeding decapsulated Artemia cysts improved survival rates. These were 90% and 87%, respectively, not significantly different from Artemia nauplii. Regarding growth, dry feed and decapsulated Artemia cysts resulted in lower growth rates than Artemia nauplii. These were 23% and 29%, respectively. Stomach content analysis showed that reduced growth in decapsulated-cyst fed larvae compared to live Artemia reflected a difference in feed ingestion and preference rather than a difference in nutritional quality of the feed. In the third experiment, it was shown that larvae require 3-day feeding on Artemia nauplii before weaning them on to trout-starter feed to prevent negative effects on growth. Three days after initial feeding, fish stomach attains its biological and physiological functions. © 2002 Elsevier Science B.V. All rights reserved.
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