A production season of turbot larvae Scophthalmus maximus (Linnaeus, 1758) reared on copepods in a Danish (56 degrees N) semi-intensive outdoor system
Turbot were reared from yolk sack larvae to juvenile in an outdoor semi-intensive system. Three production cycles were monitored from May to September. A pelagic food chain was established with phytoplankton, copepods and turbot larvae. Abiotic and biotic parameters of lower trophic levels together...
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Language: | English |
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2017
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Online Access: | https://pure.au.dk/portal/en/publications/8b30ecb6-584d-455d-b940-ed305a7b1887 https://doi.org/10.1111/are.13314 |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/8b30ecb6-584d-455d-b940-ed305a7b1887 2024-02-04T10:04:22+01:00 A production season of turbot larvae Scophthalmus maximus (Linnaeus, 1758) reared on copepods in a Danish (56 degrees N) semi-intensive outdoor system Jepsen, Per M. Jakobsen, Hans H. Rayner, Thomas A. Blanda, Elisa Novac, Aliona Engell-Sorensen, Kirsten Hansen, Benni W. 2017-09 https://pure.au.dk/portal/en/publications/8b30ecb6-584d-455d-b940-ed305a7b1887 https://doi.org/10.1111/are.13314 eng eng https://pure.au.dk/portal/en/publications/8b30ecb6-584d-455d-b940-ed305a7b1887 info:eu-repo/semantics/restrictedAccess Jepsen , P M , Jakobsen , H H , Rayner , T A , Blanda , E , Novac , A , Engell-Sorensen , K & Hansen , B W 2017 , ' A production season of turbot larvae Scophthalmus maximus (Linnaeus, 1758) reared on copepods in a Danish (56 degrees N) semi-intensive outdoor system ' , Aquaculture Research , vol. 48 , no. 9 , pp. 4958-4974 . https://doi.org/10.1111/are.13314 ACARTIA-TONSA Acartia spp BIOCHEMICAL-COMPOSITION CALANOID COPEPODS Centropages hamatus FOOD GROWTH LIPID-COMPOSITION LIVE FEEDS MARINE FISH LARVAE PIGMENTATION SURVIVAL Scophthalmus maximus carbon demand model carbon weight electivity index article 2017 ftuniaarhuspubl https://doi.org/10.1111/are.13314 2024-01-11T00:00:10Z Turbot were reared from yolk sack larvae to juvenile in an outdoor semi-intensive system. Three production cycles were monitored from May to September. A pelagic food chain was established with phytoplankton, copepods and turbot larvae. Abiotic and biotic parameters of lower trophic levels together with turbot larval survival, development, prey electivity and growth were monitored. A decreasing larval survival from 18.4% in May to 13.6% in July and just 7.0% in September was observed. The overall phytoplankton and copepod abundance decreased during the productive season. The turbot larval growth showed significant differences between larvae below (isometric) and above (allometric) 7mm. Larval fish gut content showed no differences with available prey between production cycles. Therefore, it appears that the available prey concentration is governing their growth in this outdoor system. First-feeding turbot larvae exhibited active selection for nauplii whereas developed larvae switched to copepodites and adult copepods. Although developing turbot larva exhibited active selection towards copepod size classes, there was no evidence of selective feeding on either of the two dominant copepod species. The turbot larvae's prey ingestion was modelled together with the standing stock of copepod biomass. The model results indicated that the estimated need for daily ingestion exceeded the standing stock of copepods. Hence, the initially established food web was unable to sustain the added turbot larvae with starvation as a consequence. We therefore suggest several solutions to circumvent starvation in the semi-intensive system. Article in Journal/Newspaper Scophthalmus maximus Turbot Copepods Aarhus University: Research Aquaculture Research 48 9 4958 4974 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
ACARTIA-TONSA Acartia spp BIOCHEMICAL-COMPOSITION CALANOID COPEPODS Centropages hamatus FOOD GROWTH LIPID-COMPOSITION LIVE FEEDS MARINE FISH LARVAE PIGMENTATION SURVIVAL Scophthalmus maximus carbon demand model carbon weight electivity index |
spellingShingle |
ACARTIA-TONSA Acartia spp BIOCHEMICAL-COMPOSITION CALANOID COPEPODS Centropages hamatus FOOD GROWTH LIPID-COMPOSITION LIVE FEEDS MARINE FISH LARVAE PIGMENTATION SURVIVAL Scophthalmus maximus carbon demand model carbon weight electivity index Jepsen, Per M. Jakobsen, Hans H. Rayner, Thomas A. Blanda, Elisa Novac, Aliona Engell-Sorensen, Kirsten Hansen, Benni W. A production season of turbot larvae Scophthalmus maximus (Linnaeus, 1758) reared on copepods in a Danish (56 degrees N) semi-intensive outdoor system |
topic_facet |
ACARTIA-TONSA Acartia spp BIOCHEMICAL-COMPOSITION CALANOID COPEPODS Centropages hamatus FOOD GROWTH LIPID-COMPOSITION LIVE FEEDS MARINE FISH LARVAE PIGMENTATION SURVIVAL Scophthalmus maximus carbon demand model carbon weight electivity index |
description |
Turbot were reared from yolk sack larvae to juvenile in an outdoor semi-intensive system. Three production cycles were monitored from May to September. A pelagic food chain was established with phytoplankton, copepods and turbot larvae. Abiotic and biotic parameters of lower trophic levels together with turbot larval survival, development, prey electivity and growth were monitored. A decreasing larval survival from 18.4% in May to 13.6% in July and just 7.0% in September was observed. The overall phytoplankton and copepod abundance decreased during the productive season. The turbot larval growth showed significant differences between larvae below (isometric) and above (allometric) 7mm. Larval fish gut content showed no differences with available prey between production cycles. Therefore, it appears that the available prey concentration is governing their growth in this outdoor system. First-feeding turbot larvae exhibited active selection for nauplii whereas developed larvae switched to copepodites and adult copepods. Although developing turbot larva exhibited active selection towards copepod size classes, there was no evidence of selective feeding on either of the two dominant copepod species. The turbot larvae's prey ingestion was modelled together with the standing stock of copepod biomass. The model results indicated that the estimated need for daily ingestion exceeded the standing stock of copepods. Hence, the initially established food web was unable to sustain the added turbot larvae with starvation as a consequence. We therefore suggest several solutions to circumvent starvation in the semi-intensive system. |
format |
Article in Journal/Newspaper |
author |
Jepsen, Per M. Jakobsen, Hans H. Rayner, Thomas A. Blanda, Elisa Novac, Aliona Engell-Sorensen, Kirsten Hansen, Benni W. |
author_facet |
Jepsen, Per M. Jakobsen, Hans H. Rayner, Thomas A. Blanda, Elisa Novac, Aliona Engell-Sorensen, Kirsten Hansen, Benni W. |
author_sort |
Jepsen, Per M. |
title |
A production season of turbot larvae Scophthalmus maximus (Linnaeus, 1758) reared on copepods in a Danish (56 degrees N) semi-intensive outdoor system |
title_short |
A production season of turbot larvae Scophthalmus maximus (Linnaeus, 1758) reared on copepods in a Danish (56 degrees N) semi-intensive outdoor system |
title_full |
A production season of turbot larvae Scophthalmus maximus (Linnaeus, 1758) reared on copepods in a Danish (56 degrees N) semi-intensive outdoor system |
title_fullStr |
A production season of turbot larvae Scophthalmus maximus (Linnaeus, 1758) reared on copepods in a Danish (56 degrees N) semi-intensive outdoor system |
title_full_unstemmed |
A production season of turbot larvae Scophthalmus maximus (Linnaeus, 1758) reared on copepods in a Danish (56 degrees N) semi-intensive outdoor system |
title_sort |
production season of turbot larvae scophthalmus maximus (linnaeus, 1758) reared on copepods in a danish (56 degrees n) semi-intensive outdoor system |
publishDate |
2017 |
url |
https://pure.au.dk/portal/en/publications/8b30ecb6-584d-455d-b940-ed305a7b1887 https://doi.org/10.1111/are.13314 |
genre |
Scophthalmus maximus Turbot Copepods |
genre_facet |
Scophthalmus maximus Turbot Copepods |
op_source |
Jepsen , P M , Jakobsen , H H , Rayner , T A , Blanda , E , Novac , A , Engell-Sorensen , K & Hansen , B W 2017 , ' A production season of turbot larvae Scophthalmus maximus (Linnaeus, 1758) reared on copepods in a Danish (56 degrees N) semi-intensive outdoor system ' , Aquaculture Research , vol. 48 , no. 9 , pp. 4958-4974 . https://doi.org/10.1111/are.13314 |
op_relation |
https://pure.au.dk/portal/en/publications/8b30ecb6-584d-455d-b940-ed305a7b1887 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1111/are.13314 |
container_title |
Aquaculture Research |
container_volume |
48 |
container_issue |
9 |
container_start_page |
4958 |
op_container_end_page |
4974 |
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1789972783298510848 |