Influence of food concentration on the physiological energetics and growth ofOstrea edulis larvae |
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Authors: | R Beiras A Pérez Camacho |
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Institution: | (1) Centro Costero de A Coruña, Instituto Español de Oceanografía, Apartado 130, E-15080 A Coruña, Galicia, Spain;(2) Present address: IFREMER Station d'Arccachon, Quai Silhouette, F-33120 Arcachon, France |
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Abstract: | Feeding, respiration and growth rates of oyster (Ostrea edulis L.) larvae reared at five food levels were measured throughout the entire larval period. Energy budgets were derived as a function of alga (Isochrysis galbana Parke) food concentration. Ingestion rate (IR, cells h-1) and oxygen consumption rate (
, nl h-1) were almost isometric functions of larval size ash-free dry weight, (AFDW, g)], characterized by the equations: IR=803.9 AFDW1.13 and
=4.85 AFDW1.09. Ingested ration was directly correlated to cell concentration up to a maximum at 200 cells l-1, with further increases failing to support higher ingestion rates. Likewise, growth rate linearly increased with food ration up to 100 cells l-1 (max. growth efficiency,K
1=25%) and reached a maximum at 200 cells l-1 (growth rate=5.6 m d-1), with further increases in food not supporting significantly faster growth. Maintenance ration was 2 to 3% daily dry weight (DW); optimum ration increased during larval development from 5 to 20% DW; maximum ration was 20% DW. During larval rearing, an increasing feeding schedule of 50, 100 and 200 cells l-1 from Days 0, 5 and 10, respectively, is recommended. |
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