Replacement of cod liver oil with soybean or coconut oil in diets of larval goldfish, Carassius auratus L.

Abstract

A study was conducted to determine the influence off six diets, varying in lipid source and protein level on growth off goldfish (Carasius auratus 1L.) larvae during the initial period off 20 days of rearing. One day post hatching larvae were introduced into glass indoor tanks at a stocking density of 20 per 10 litre. Larvae were fed six diets in triplicates D1 (cod liver oil, high protein), D2 (soybean oil, high protein), D3 (coconut oil, high protein), D4 (cod liver oil, low protein), OS (soybean oil, low protein) and D6 (coconut oil, low protein) with two negative control groups (UC). After 2© days except for controls, survival was more than 75% in all the tanks. Total length off larvae was not significantly different (P>0.05) among treatments D1 (113 mm), D2 (11.0 mm) and ©3 (11.1 mm) and among ©4 (10.4 mm), B5 (10.2 mm) and D6 (10.4 mm). Based on the growth performance, it is concluded that cod liver oil could be replaced with soybean oil or coconut oil in goldfish larval diets and dietary protein requirement could be close to 30%.