Abstract:

Feeding trials were conducted to establish the optimum supplementation level of Ulva pertusa meal in diets of black sea bream (Acanthopagrus schlegeli) with a view to minimizing body weight loss during wintering. Fish of 56 g in initial body weight were reared with formulated diets supplemented with various levels of Ulva meal (0, 205, 10 and 15%) for 63 days in floating net cages.
The Ulva meal diets repressed lipid accumulation in intraperitoneal body fat without loss of growth and feed efficiency.
After the feeding experiment, the fish were wintered for 150 days without artificial feeding. The body weight of fish fed an Ulva-free diet and a 15% Ulva meal diet decreased significantly. Groups fed 2.5, 5 and 10% Ulva meal did not show significant body weight loss. The suppression of body weight loss would be ascribed to preferential mobilization of reserved lipids and retention of muscle protein.

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Date 1993/10/01

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