Utilização de náuplios de branchoneta Dendrocephalus brasiliensis (Pesta, 1921), na alimentação de larvas do camarão cinza Litopenaeus vannamei (Boone, 1931)

Abstract

The experimental study with nauplii of Dendrocephalus brasiliensis in Litopenaeus vannamei larval feeding was carried out, at the laboratory of pos-larval production of the Empresa Pernambucana de Pesquisa Agropecuária (IPA-PE), near Porto de Galinha in Ipojuca. The aim of this study was to evaluate the performance of Dendrocephalus brasiliensis as food for Litopenaeus vannamei larvae and post-larvae.The Litopenaeus vannamei larvae (Protozoea PZ3) were stocked in 15 containers fill up with 10 liter of water, at a density of 100 larvae/L and grown during 18 days until post-larvae (PL10). The experiment consisted of 5 feeding treatments: T1), live Artemia sp. nauplii; T2), live D. brasiliensis nauplii; T3), frozen D. brasiliensis; T4), a combination of live Artemia sp. nauplii and live D. brasiliensis nauplii; T5), a combination of live Artemia sp. nauplii and frozen D. brasiliensis nauplii. The Larvae were fed 8 times a day; during the first 2 days were putted 800 D. brasiliensis nauplii/L/day, form day 3 to day 6 were given 2000 D. brasiliensis nauplii/L/day and from the 7th day till the 4000 D. brasiliensis nauplii/L/day.The larvae were completed the metamorphosis to post-larvae (PL1) in, 169, 168, 170, 171 and 169 hours for treatments 1, 2, 3, 4 and 5. The mean weight and length at (PL1) stage were, 444.444 μg and 6 mm for T1, 592.59 μg and 5.866 mm for T2, 224.082 μg and 5.733 mm for T3, 448.838 μg and 5.6 mm for T4 and 290.474 μg and 5.866 mm for T5. The experiment was finished at the PL10 stage when the post-larvae were counted to determine the survival rate. The survival results shown: 58.8%; 35.5%; 36.6%; 76.3% and 79.3% for T1, T2, T3, T4, and T5. At the end of this experiment the PL reach a mean weight and length of 1552.538μg and 8.833mm for T1, 1253.617μg and 9.2mm for T2, 690.413μg and 8.433mm for T3, 1522.717μg and 9.3mm for T4 and 1391.33μg and 9.466mm for T5. The results as survival rate data, metamorphosis time, final weight and lenght of larvae of each experiment obtained were statistically analyzed using ANOVA (P<0,05), Tukey and SNK tests. There are significant differences between the 5 feeding treatments. According to the results are concluded that D. brasiliensis nauplii (congealed or live) may be useful in combination with live Artemia sp. nauplii, as food for Litopenaeus vannamei larvae.