Abstract
The effect of rotifers, Brachionus rotundiformis (S-type), fed three different diets: A (rotifer fed Nannochloropsis oculata), B (rotifer fed N. oculata and baker's yeast, 1:1), and C (rotifer fed N. oculata and baker's yeast, 1:1, and enriched with Selcoregister mark or target), was evaluated based on the survival, growth and swim bladder inflation rate of fat snook larvae. Rotifers of treatment A had higher levels (4.58 mg/g dry weight) of eicosapentaenoic acid (EPA) than B (1.81 mg/g dry weight), and similar levels (0.04 and 0.06 mg/g dry weight, respectively) of docosahexaenoic acid (DHA). Rotifers of treatment C had the highest levels of EPA (13.2 mg/g dry weight) and DHA (6.08 mg/g dry weight). Fat snook eggs were obtained by spawning induction with human chorionic gonadotropin. Thirty hours after hatching, 30 larvae/liter were stocked in black cylindric-conical tanks (36-liter capacity). After 14 days of culture, there were no significant differences among treatments. Mean standard length was 3.13 mm for treatment A, 3.17 mm for B, and 3.39 mm for C. Mean survival rates were very low (2.7% for treatment A, 2.3% for B, and 1.8% for C). Swim bladder inflation rates were 34.7% for treatment A, 27.1% for B, and 11.9% for C. The lack of differences in growth and survival among treatments showed that the improvement of the dietary value of rotifer may not have been sufficient to solve the problem of larval rearing. Some other factor, probably pertaining to the quality of the larvae, may have negatively influenced survival.
Highlights
Fat snook, Centropomus parallelus Poey, 1860, is a highly valued sport fish which inhabits the tropical and subtropical western Atlantic [1]
Its nutritional value is strictly dependent on the nutritional value of its food source, the content of highly unsaturated fatty acids ((n-3) HUFA), like docosahexaenoic acid (DHA, 22:6(n3)) and eicosapentaenoic acid (EPA, 20:5(n3))
Rainuzzo et al [7] emphasized the relevance of DHA to the development of neural tissues such as brain and retina, considering that the larval head constitutes a significant part of the body mass, and that predatory fish larvae rely on vision to capture their food
Summary
Fat snook (robalo or camorim), Centropomus parallelus Poey, 1860, is a highly valued sport fish which inhabits the tropical and subtropical western Atlantic [1]. The effect of rotifers, Brachionus rotundiformis (S-type), fed three different diets: A (rotifer fed Nannochloropsis oculata), B (rotifer fed N. oculata and bakers yeast, 1:1), and C (rotifer fed N. oculata and bakers yeast, 1:1, and enriched with Selcoâ), was evaluated based on the survival, growth and swim bladder inflation rate of fat snook larvae. In the present study we compared survival, growth, and swim bladder inflation of fat snook larvae fed rotifers reared on different diets, resulting in different fatty acid compositions.
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