Plankton composition and biomass development

a seasonal study of a semi-intensive outdoor system for rearing of turbot

Hans Henrik Jakobsen, Per Meyer Jepsen, Elisa Blanda, Niels O. G. Jørgensen, Aliona Novac, Kirsten Engell-Sørensen, Benni Winding Hansen

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

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 lg chlorophyll a L-1) to fall (ca. 7 lg 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.
OriginalsprogEngelsk
TidsskriftAquaculture Nutrition
Vol/bind22
Udgave nummer6
Sider (fra-til)1239-1250
Antal sider12
ISSN1353-5773
DOI
StatusUdgivet - 6 dec. 2016

Citer dette

Jakobsen, Hans Henrik ; Jepsen, Per Meyer ; Blanda, Elisa ; Jørgensen, Niels O. G. ; Novac, Aliona ; Engell-Sørensen, Kirsten ; Hansen, Benni Winding. / Plankton composition and biomass development : a seasonal study of a semi-intensive outdoor system for rearing of turbot. I: Aquaculture Nutrition. 2016 ; Bind 22, Nr. 6. s. 1239-1250.
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abstract = "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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Plankton composition and biomass development : a seasonal study of a semi-intensive outdoor system for rearing of turbot. / Jakobsen, Hans Henrik; Jepsen, Per Meyer; Blanda, Elisa; Jørgensen, Niels O. G.; Novac, Aliona; Engell-Sørensen, Kirsten; Hansen, Benni Winding.

I: Aquaculture Nutrition, Bind 22, Nr. 6, 06.12.2016, s. 1239-1250.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

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T2 - a seasonal study of a semi-intensive outdoor system for rearing of turbot

AU - Jakobsen, Hans Henrik

AU - Jepsen, Per Meyer

AU - Blanda, Elisa

AU - Jørgensen, Niels O. G.

AU - Novac, Aliona

AU - Engell-Sørensen, Kirsten

AU - Hansen, Benni Winding

PY - 2016/12/6

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AB - 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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