Some biological aspects of cod larvae (Gadus morhua L.)
The development of functional larval stages is described in relation to different yolk sac stages. Morphological and histological work has been done concomitantly with the observation on the larval feeding behaviour. Larvae were fed different sizes of phytoplankters and nauplii of Artemia salina. Co...
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[Fiskeridirektoratets havforskningsinstitutt]
1980
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ftimr:oai:imr.brage.unit.no:11250/114436 2023-05-15T16:19:07+02:00 Some biological aspects of cod larvae (Gadus morhua L.) Ellertsen, Bjørnar Solemdal, Per Strømme, Tore Tilseth, Snorre Westgård, Trond Moksness, Erlend Øiestad, Victor 1980 842920 bytes application/pdf http://hdl.handle.net/11250/114436 eng eng [Fiskeridirektoratets havforskningsinstitutt] Fiskeridirektoratets skrifter, Serie Havundersøkelser vol 17 no 1 http://hdl.handle.net/11250/114436 s. 29-47 Research report 1980 ftimr 2021-09-23T20:14:31Z The development of functional larval stages is described in relation to different yolk sac stages. Morphological and histological work has been done concomitantly with the observation on the larval feeding behaviour. Larvae were fed different sizes of phytoplankters and nauplii of Artemia salina. Cod larvae proved to avoid small flaggelates but were active feeders on bigger sized phytoplankters. The problem concerning the influence of phytoplankters on the first feeding cod larvae is discussed. Cod larvae were shown to be a visual feeder on nauplii and the light intensity threshold was between 0.1-0.4 lux. The point of no return (PNR) is tentatively determined, and the cod larval condition at that stage is compared to larval groups from the enclosure experiment (ELLERTSEN et al., 1979b) which had experienced different feeding conditions. The following characters were found suitable for determining the condition of first feeding cod larvae: the size of the yolk sac, larval standard length, dry weight, height of the myotome, the differentiation of the swim bladder and the alimentary tract. Report Gadus morhua Institute for Marine Research: Brage IMR |
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Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
description |
The development of functional larval stages is described in relation to different yolk sac stages. Morphological and histological work has been done concomitantly with the observation on the larval feeding behaviour. Larvae were fed different sizes of phytoplankters and nauplii of Artemia salina. Cod larvae proved to avoid small flaggelates but were active feeders on bigger sized phytoplankters. The problem concerning the influence of phytoplankters on the first feeding cod larvae is discussed. Cod larvae were shown to be a visual feeder on nauplii and the light intensity threshold was between 0.1-0.4 lux. The point of no return (PNR) is tentatively determined, and the cod larval condition at that stage is compared to larval groups from the enclosure experiment (ELLERTSEN et al., 1979b) which had experienced different feeding conditions. The following characters were found suitable for determining the condition of first feeding cod larvae: the size of the yolk sac, larval standard length, dry weight, height of the myotome, the differentiation of the swim bladder and the alimentary tract. |
format |
Report |
author |
Ellertsen, Bjørnar Solemdal, Per Strømme, Tore Tilseth, Snorre Westgård, Trond Moksness, Erlend Øiestad, Victor |
spellingShingle |
Ellertsen, Bjørnar Solemdal, Per Strømme, Tore Tilseth, Snorre Westgård, Trond Moksness, Erlend Øiestad, Victor Some biological aspects of cod larvae (Gadus morhua L.) |
author_facet |
Ellertsen, Bjørnar Solemdal, Per Strømme, Tore Tilseth, Snorre Westgård, Trond Moksness, Erlend Øiestad, Victor |
author_sort |
Ellertsen, Bjørnar |
title |
Some biological aspects of cod larvae (Gadus morhua L.) |
title_short |
Some biological aspects of cod larvae (Gadus morhua L.) |
title_full |
Some biological aspects of cod larvae (Gadus morhua L.) |
title_fullStr |
Some biological aspects of cod larvae (Gadus morhua L.) |
title_full_unstemmed |
Some biological aspects of cod larvae (Gadus morhua L.) |
title_sort |
some biological aspects of cod larvae (gadus morhua l.) |
publisher |
[Fiskeridirektoratets havforskningsinstitutt] |
publishDate |
1980 |
url |
http://hdl.handle.net/11250/114436 |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
s. 29-47 |
op_relation |
Fiskeridirektoratets skrifter, Serie Havundersøkelser vol 17 no 1 http://hdl.handle.net/11250/114436 |
_version_ |
1766005437755293696 |