Cargando…

Foraging behaviour of larval cod (Gadus morhua) at low light intensities

The ability to forage at low light intensities can be of great importance for the survival of fish larvae in a pelagic environment. Three-dimensional silhouette imaging was used to observe larval cod foraging and swimming behaviour at three light intensities (dusk ~1.36 × 10(−3) W/m(2), night ~1.38 ...

Descripción completa

Detalles Bibliográficos
Autores principales: Vollset, K. W., Folkvord, A., Browman, H. I.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer-Verlag 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3873023/
https://www.ncbi.nlm.nih.gov/pubmed/24391266
http://dx.doi.org/10.1007/s00227-011-1635-5
_version_ 1782297043561086976
author Vollset, K. W.
Folkvord, A.
Browman, H. I.
author_facet Vollset, K. W.
Folkvord, A.
Browman, H. I.
author_sort Vollset, K. W.
collection PubMed
description The ability to forage at low light intensities can be of great importance for the survival of fish larvae in a pelagic environment. Three-dimensional silhouette imaging was used to observe larval cod foraging and swimming behaviour at three light intensities (dusk ~1.36 × 10(−3) W/m(2), night ~1.38 × 10(−4) W/m(2) and darkness ~3.67 × 10(−6) W/m(2)) at 4 different ages from 6 to 53 days post-hatch (dph). At 6 dph, active pursuit of prey was only observed under dusk conditions. Attacks, and frequent orientations, were observed from 26 dph under night conditions. This was consistent with swimming behaviour which suggested that turn angles were the same under dusk and night conditions, but lower in darkness. Cod at 53 dph attacked prey in darkness and turn angles were not different from those under other light conditions. This suggests that larvae are still able to feed at light intensities of 3.67 × 10(−6) W/m(2). We conclude that larval cod can maintain foraging behaviour under light intensities that correspond to night-time at depths at which they are observed in the field, at least if they encounter high-density patches of prey such as those that they would encounter at thin layers or fronts.
format Online
Article
Text
id pubmed-3873023
institution National Center for Biotechnology Information
language English
publishDate 2011
publisher Springer-Verlag
record_format MEDLINE/PubMed
spelling pubmed-38730232014-01-02 Foraging behaviour of larval cod (Gadus morhua) at low light intensities Vollset, K. W. Folkvord, A. Browman, H. I. Mar Biol Original Paper The ability to forage at low light intensities can be of great importance for the survival of fish larvae in a pelagic environment. Three-dimensional silhouette imaging was used to observe larval cod foraging and swimming behaviour at three light intensities (dusk ~1.36 × 10(−3) W/m(2), night ~1.38 × 10(−4) W/m(2) and darkness ~3.67 × 10(−6) W/m(2)) at 4 different ages from 6 to 53 days post-hatch (dph). At 6 dph, active pursuit of prey was only observed under dusk conditions. Attacks, and frequent orientations, were observed from 26 dph under night conditions. This was consistent with swimming behaviour which suggested that turn angles were the same under dusk and night conditions, but lower in darkness. Cod at 53 dph attacked prey in darkness and turn angles were not different from those under other light conditions. This suggests that larvae are still able to feed at light intensities of 3.67 × 10(−6) W/m(2). We conclude that larval cod can maintain foraging behaviour under light intensities that correspond to night-time at depths at which they are observed in the field, at least if they encounter high-density patches of prey such as those that they would encounter at thin layers or fronts. Springer-Verlag 2011-02-13 2011 /pmc/articles/PMC3873023/ /pubmed/24391266 http://dx.doi.org/10.1007/s00227-011-1635-5 Text en © The Author(s) 2011 https://creativecommons.org/licenses/by-nc/4.0/ This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
spellingShingle Original Paper
Vollset, K. W.
Folkvord, A.
Browman, H. I.
Foraging behaviour of larval cod (Gadus morhua) at low light intensities
title Foraging behaviour of larval cod (Gadus morhua) at low light intensities
title_full Foraging behaviour of larval cod (Gadus morhua) at low light intensities
title_fullStr Foraging behaviour of larval cod (Gadus morhua) at low light intensities
title_full_unstemmed Foraging behaviour of larval cod (Gadus morhua) at low light intensities
title_short Foraging behaviour of larval cod (Gadus morhua) at low light intensities
title_sort foraging behaviour of larval cod (gadus morhua) at low light intensities
topic Original Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3873023/
https://www.ncbi.nlm.nih.gov/pubmed/24391266
http://dx.doi.org/10.1007/s00227-011-1635-5
work_keys_str_mv AT vollsetkw foragingbehaviouroflarvalcodgadusmorhuaatlowlightintensities
AT folkvorda foragingbehaviouroflarvalcodgadusmorhuaatlowlightintensities
AT browmanhi foragingbehaviouroflarvalcodgadusmorhuaatlowlightintensities