Abstract
Three compound diets, based on fish protein hydrolysate and yeast (diet A), soybean protein concentrate and yeast (diet B) and fish meal (diet C), were tested with start-feeding sea bass and carp larvae, during 28 days at 19°C (4 replicates) and 20 days at 24°C (3 replicates), respectively. In sea bass larvae, diet A yielded better results (survival: 35±6%, mean weight: 3.4±0.8 mg) than diets B (survival: 14±2%, mean weight: 1.8±0.4 mg) and C (survival: 19±5%, mean weight 1.1±0.2 mg). In carp larvae, feeding diet A resulted in a high survival (86±7%) and the best growth (mean weight: 73±14 mg), diet B led to in a higher survival (98±1%) but to a lower growth (mean weight: 45±12 mg) and diet C gave the poorest survival (45±6%) and mean weight (11±1 mg). Thus, start-feeding sea bass larvae proved to be able to utilize compound diets, as previously shown in carp and other freshwater fish larvae. Although inferior to live food, diet A containing fish protein hydrolysate supported significant growth and survival and can serve as a starting point for further study of the nutritional requirements of sea bass larvae.
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