Use of enriched rotifers and Artemia during larviculture of Atlantic cod (Gadus morhua Linnaeus, 1758): effects on early growth, survival and lipid composition

摘要

A feeding experiment was conducted to evaluate the effect of rotifers (Brachionus plicatilis) and Artemia sp. enriched differently on early growth, survival and lipid class composition of Atlantic cod larvae (Gadus morhua). Rotifers enrichments tested were: (1) AlgaMac 2000p, (2) AquaGrowp Advantage and (3) a combination of Pavlova sp. paste and AlgaMac 2000p. The same treatments were tested with Artemia as well as a combination of DC DHA Selcop and AlgaMac 2000p as a fourth treatment. After rotifer feeding, the larvae from treatment 3 [1.50 pl 0.11 mg dry weight (dw)] were significantly heavier than larvae from treatment 2 (1.03 pl 0.04 mg dw). After feeding Artemia, the larvae from treatment 1 were significantly heavier (12.06 pl 2.54 mg dw) than those from treatments 3 (6.5 pl 0.73 mg dw) and 4 (5.31 pl 1.01 mg dw). Treatment 3 resulted in the best survival through the 59 days of larviculture. After rotifer feeding, high larval concentrations of docosahexaenoic acid (DHA), eicosapentaenoic acid (EPA), arachidonic acid (AA) and s6 docosapentaenoic acid (s6DPA) could be linked to better larval growth and survival while after feeding Artemia, high larval DHA/EPA ratios (~3) and high DPA/AA ratios (>1) could be linked to better survival.