Effect of enriched live feeds on survival and growth rates in larval Korean rockfish,Sebastes schlegeliHilgendorf

Abstract

High mortality frequently occurs in larval mass production of Korean rock®sh, Sebastes schlegeli Hilgendorf. Nutritional de®ciencies in live feeds, rotifers and Artemia nauplii, fed to larvae could be a reason. A series of experiments was carried out to evaluate the effect of nutritional enrichment of live feeds by w-yeast, Spirulina powder and Super Selco TM on survival and growth rates in rock®sh larvae. Preference of rock®sh larvae for the live feeds was determined by analysis of stomach contents. In addition, the effect of green water produced by the use of Chlorella ellipsoidea and Spirulina powder on the growth performance of larvae was evaluated. Larvae fed rotifers nutritionally enriched with Super Selco showed signi®cantly higher survival rates than those fed rotifers enriched with w-yeast. Larvae fed rotifers that were nutritionally enriched with both Super Selco and Spirulina together exhibited improved growth and survival rates. Larvae fed Artemia nauplii nutritionally enriched with Spirulina powder showed signi®cantly higher survival than larvae fed Artemia nauplii without enrichment. When larvae were fed rotifers, Artemia nauplii or the mixture of rotifers and Artemia nauplii, the second and last group showed signi®cantly higher survival than the ®rst group. Fatty acid composition in live feeds was improved by enrichment of w-yeast and larvae fed this feed showed higher survival and growth rates compared with larvae fed nonenriched feeds. No positive effect of green water in the tank produced with C. ellipsoidea or Spirulina powder was observed on survival and growth rates for larvae fed nutritionally enriched rotifers with Super Selco and Spirulina powder. However, when the larvae were fed Artemia nauplii that were nutritionally enriched with w-yeast and Spirulina powder, green water obtained by adding Spirulina powder to the tanks resulted in signi®cantly higher growth rates of larvae than was obtained by adding C. ellipsoidea.

Feed and Feeding Regime Affect Growth Rate and Gonadosomatic Index of Adult Zebrafish (Danio Rerio)

“…The use of 0.5 mg spirulina per mL enrichment water was capable of providing more x-6 fatty acids then what we report here. 37 However, in both, this study and Cho et al, EPA and DHA are not present in Artemia. It is clear that the enrichment protocol used in this study would benefit from changes in protocol and enrichment media used.…”

Optimum temperature and salinity conditions for growth of green algae Chlorella ellipsoidea and Nannochloris oculata

“…Application of green algae has been tried for marine fish hatcheries because the algae are commonly used as food for the first live foods (such as rotifers and Artemia nauplii) for early larval fish, or directly added to the rearing tanks for larval fish production to achieve the ‘green water effect’ 1 . Supplementation of algae into the larval rearing tanks improved survival and/or growth of larval fish 2–5 …”

“…1 Supplementation of algae into the larval rearing tanks improved survival and/or growth of larval fish. [2][3][4][5] In addition, the use of microalgae lead to a decrease in numbers of bacteria associated with the rotifer culture when compared with the rotifer culture fed yeast-based diets in the rotifer culture tanks. 6 The high nutrient content in microalgae improved the lipid and fatty acid compositions of rotifers when either fed to rotifers, or supplied to the larval fish tanks, and eventually resulted in an improvement of fish production.…”

CRESCIMENTO E SOBREVIVÊNCIA DE JUVENIS DO LINGUADO Paralichthys orbignyanus: EFEITOS DO ENRIQUECIMENTO DA ARTEMIA SP. COM N-3 HUFA

“…hippoglossus (Hamre & Harboe 2008) e outras espécies de peixes como o "Korean rockfish" Sebastes schlegeli (Cho et al 2001) …”