Enhanced biological performance of intensive sea bream (Sparus aurata) larviculture in the presence of phytoplankton with long photophase

TitleEnhanced biological performance of intensive sea bream (Sparus aurata) larviculture in the presence of phytoplankton with long photophase
Publication TypeJournal Article
Year of Publication2002
AuthorsPapandroulakis, N, Divanach P, Kentouri M
JournalAquaculture
Volume204
Issue1-2
Pages45 - 63
KeywordsConsumption, Larvae, Photophase, Phytoplankton, Sea bream
Abstract

Sea bream larvae were reared under intensive conditions either with (pseudo-green water technique) or without (clear water technique) the addition of phytoplankton in the rearing tanks, under 24- or 18-h photophases. Phytoplankton presence in the rearing medium resulted in 44 ± 17% survival and individuals of 2.0 ± 0.2 mg wet weight after 20 days of rearing. With the clear water method, both survival and growth decreased to 16 ± 6% and 1.1 ± 0.2 mg, respectively. The daily consumption rate (as milligram of carbon consumed per milligram body carbon) at the beginning of exogenous feeding was 0.5 day-1 for all experimental conditions. At later stages, individuals reared with phytoplankton present had a daily consumption rate of about 0.7 day-1, while those reared with the clear water technique presented consumption rates from 1.0 (for 24-h photophase) to 1.9 day-1 (for 18-h photophase). The mean food assimilation efficiency of the larvae, expressed as a Food Conversion Index (FCI), was between 6.3 ± 1.4 (for 18-h photophase) and 8.2 ± 1.2 (for 24-h photophase) for the individuals reared in the presence of phytoplankton. For larvae reared using the clear water technique, FCI was between 12.8 ± 2.4 (for 24-h photophase) and 20.1 ± 5.3 (for 18-h photophase). © 2002 Elsevier Science B.V. All rights reserved.

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