Plankton composition and biomass development: a seasonal study of a semi-intensive outdoor system for rearing of turbot
Plankton food web dynamics were studied during a complete production season in a semi‐intensive land‐based facility for rearing of turbot (Scophthalmus maximus) larvae. The production season was divided into three production cycles of 3–5 weeks. Phytoplankton biomass (using chlorophyll a as biomass...
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Published in | Aquaculture nutrition Vol. 22; no. 6; pp. 1239 - 1250 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Oxford
Blackwell Publishing Ltd
01.12.2016
Hindawi Limited |
Subjects | |
Online Access | Get full text |
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Summary: | Plankton food web dynamics were studied during a complete production season in a semi‐intensive land‐based facility for rearing of turbot (Scophthalmus maximus) larvae. The production season was divided into three production cycles of 3–5 weeks. Phytoplankton biomass (using chlorophyll a as biomass proxy) peaked in each production cycle. However, the maximum biomass decreased from spring (18 μg chlorophyll a L−1) to fall (ca. 7 μg chlorophyll a L−1), simultaneous with a decline in the concentration of dissolved nitrogen in the inoculating water. During the three production cycles, we observed decreasing copepod nauplii concentration from spring to fall in the rearing tanks. The decreasing nitrogen gave increasing carbon to chlorophyll a ratio in the seston (from 23 in spring to 73 in fall). The pool of free amino acids in seston was constant. We suggest that the decreasing nitrogen input in the inoculating water reduces the quality of the phytoplankton and thus the growth potential of the prey for fish larvae, copepods. |
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Bibliography: | Sectoral Operational Programme Human Resources Development ArticleID:ANU12328 ark:/67375/WNG-G25KV4H4-S VELUX foundation - No. VKR022608 EliteForsk travel - No. 11-116388 istex:671A30B30DCCEB3607A3FADFD750FBED14262C0E Danish Strategic Research council - No. #10-093522 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1353-5773 1365-2095 |
DOI: | 10.1111/anu.12328 |