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1.
Rev. bras. pesqui. méd. biol ; Braz. j. med. biol. res;34(5): 645-651, May 2001. tab
Artículo en Inglés | LILACS | ID: lil-285861

RESUMEN

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 Selcoâ), 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 percent for treatment A, 2.3 percent for B, and 1.8 percent for C). Swim bladder inflation rates were 34.7 percent for treatment A, 27.1 percent for B, and 11.9 percent 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


Asunto(s)
Animales , Masculino , Femenino , Alimentación Animal , Dieta , Grasas Insaturadas en la Dieta/administración & dosificación , Ácidos Grasos Insaturados/administración & dosificación , Peces/crecimiento & desarrollo , Grasas Insaturadas en la Dieta/análisis , Ácidos Grasos Insaturados/análisis , Larva/efectos de los fármacos , Larva/crecimiento & desarrollo , Rotíferos , Tasa de Supervivencia
2.
Braz J Med Biol Res ; 34(5): 645-51, 2001 May.
Artículo en Inglés | MEDLINE | ID: mdl-11323752

RESUMEN

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.


Asunto(s)
Alimentación Animal , Lubina/crecimiento & desarrollo , Dieta , Grasas Insaturadas en la Dieta/farmacología , Ácidos Grasos Insaturados/farmacología , Animales , Grasas Insaturadas en la Dieta/administración & dosificación , Grasas Insaturadas en la Dieta/análisis , Ácidos Grasos Insaturados/administración & dosificación , Ácidos Grasos Insaturados/análisis , Femenino , Humanos , Larva/efectos de los fármacos , Larva/crecimiento & desarrollo , Masculino , Rotíferos
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