Growth, survival and fatty acid profile of Nereis diversicolor (O. F. Müller, 1776) fed on six different diets
Abstract:Cultured Nereis diversicolor are used as food for flat fish and shrimp on aquaculture farms. In order to improve cultures of N. diversicolor we determined the growth and survival rates of juvenile worms fed with six different diets for 60 d in the laboratory. Experiments were carried out with 1 mo old worms and fed every other day ad libitum. The six diets were: decapsulated Artemia cysts, sea bream dry food, Lansy (diet for late post larval stage of shrimp), Tetramin (fish dry food), extruded soy and pollen. The photoperiod was adjusted to 16L:8D with an average light intensity of 175 Lux. Temperature and salinity were maintained at 20 ± 2°C and 15‰, respectively. Three replicates were setup for each treatment with six individuals per replicate. Worms fed Lansy had the highest daily growth rate (13.94 mg d−1) and 100% survival rate. Each type of food was analyzed for organic matter, caloric and total lipid content. The organic matter content of sediments was also analyzed. No direct relationship between growth and dietary type was noted. The fatty acid content of the worms was related to the specific diet. Higher levels of the total lipids, DHA (docosahexaenoic acid) and EPA (eicosapentanoic acid) were more closely related to the 1 mo old juvenile worms. However, when diets have a high DHA/EPA ratio, there does not appear to be any relationship to juveniles which seems to indicate that N. diversicolor does not have a high DHA requirement. In any event we believe that higher HUFA (high unsaturated fatty acid) levels (mainly EPA and DHA) result in higher survival rates and better growth rates.
Document Type: Research Article
Publication date: 2000-07-01
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