Effect of food deprivation on distribution of larval and early juvenile cod in experimental vertical temperature and light gradients
How and when food limits the growth and survival of larval fish are essential questions which link oceanography and fisheries science, and theory suggests that food availability may affect survival through behavioural responses. We tested the effect of food deprivation on the vertical distribution o...
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Online Access: | http://hdl.handle.net/11250/109255 https://doi.org/10.3354/meps10129 |
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ftimr:oai:imr.brage.unit.no:11250/109255 2023-05-15T16:19:22+02:00 Effect of food deprivation on distribution of larval and early juvenile cod in experimental vertical temperature and light gradients Vollset, Knut Wiik Catalán, I. A. Fiksen, Øyvind Folkvord, Arild 2013-02-14 application/pdf http://hdl.handle.net/11250/109255 https://doi.org/10.3354/meps10129 eng eng Inter-Research Vollset KW, Catalán IA, Fiksen Ø, Folkvord A (2013) Effect of food deprivation on distribution of larval and early juvenile cod in experimental vertical temperature and light gradients. Mar Ecol Prog Ser 475:191-201 urn:issn:0171-8630 urn:issn:1616-1599 http://hdl.handle.net/11250/109255 https://doi.org/10.3354/meps10129 191-201 475 Marine Ecology Progress Series cod torsk fish larvae fiskelarver food supply mattilgang VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922 Journal article Peer reviewed 2013 ftimr https://doi.org/10.3354/meps10129 2021-09-23T20:15:38Z How and when food limits the growth and survival of larval fish are essential questions which link oceanography and fisheries science, and theory suggests that food availability may affect survival through behavioural responses. We tested the effect of food deprivation on the vertical distribution of larval cod Gadus morhua in light and temperature gradients during larval and early juvenile stages. Groups of fed (ad lib) and unfed (16 h) larval cod at 16, 30 and 37 d post hatch (dph) and early juvenile cod at 44 dph were repeatedly observed in experimental columns with temperature gradients (110 × 15 cm, 6 to 8°C) for a period of 3 h while the directionality of the light was manipulated. At earlier stages (16 and 30 dph), larvae were distributed mainly in the upper part of the column regardless of the water stratification. The presence of a thermocline reduced the likelihood of cod being observed in the lower part of the column at 37 and 44 dph, but this response was not affected by feeding history. Unfed larvae distributed deeper in the column than fed larvae, but this effect was small (on average, 4.3 cm difference in a 115 cm column). Video analysis of individual swimming behaviour at 44 dph indicated that, while unfed cod would not stay longer or swim deeper into the columns than fed cod, there was an increased number of fish swimming up and down in the column, suggesting an increased motivation to sample new environments. We conclude that short-term food deprivation (16 h) has a small but significant effect on larval vertical distribution, most likely as a consequence of increased prey-search behaviour, but that temperature and ontogeny were the key factors in determining distribution patterns. 2018-02-14 Article in Journal/Newspaper Gadus morhua Institute for Marine Research: Brage IMR Marine Ecology Progress Series 475 191 201 |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
cod torsk fish larvae fiskelarver food supply mattilgang VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922 |
spellingShingle |
cod torsk fish larvae fiskelarver food supply mattilgang VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922 Vollset, Knut Wiik Catalán, I. A. Fiksen, Øyvind Folkvord, Arild Effect of food deprivation on distribution of larval and early juvenile cod in experimental vertical temperature and light gradients |
topic_facet |
cod torsk fish larvae fiskelarver food supply mattilgang VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922 |
description |
How and when food limits the growth and survival of larval fish are essential questions which link oceanography and fisheries science, and theory suggests that food availability may affect survival through behavioural responses. We tested the effect of food deprivation on the vertical distribution of larval cod Gadus morhua in light and temperature gradients during larval and early juvenile stages. Groups of fed (ad lib) and unfed (16 h) larval cod at 16, 30 and 37 d post hatch (dph) and early juvenile cod at 44 dph were repeatedly observed in experimental columns with temperature gradients (110 × 15 cm, 6 to 8°C) for a period of 3 h while the directionality of the light was manipulated. At earlier stages (16 and 30 dph), larvae were distributed mainly in the upper part of the column regardless of the water stratification. The presence of a thermocline reduced the likelihood of cod being observed in the lower part of the column at 37 and 44 dph, but this response was not affected by feeding history. Unfed larvae distributed deeper in the column than fed larvae, but this effect was small (on average, 4.3 cm difference in a 115 cm column). Video analysis of individual swimming behaviour at 44 dph indicated that, while unfed cod would not stay longer or swim deeper into the columns than fed cod, there was an increased number of fish swimming up and down in the column, suggesting an increased motivation to sample new environments. We conclude that short-term food deprivation (16 h) has a small but significant effect on larval vertical distribution, most likely as a consequence of increased prey-search behaviour, but that temperature and ontogeny were the key factors in determining distribution patterns. 2018-02-14 |
format |
Article in Journal/Newspaper |
author |
Vollset, Knut Wiik Catalán, I. A. Fiksen, Øyvind Folkvord, Arild |
author_facet |
Vollset, Knut Wiik Catalán, I. A. Fiksen, Øyvind Folkvord, Arild |
author_sort |
Vollset, Knut Wiik |
title |
Effect of food deprivation on distribution of larval and early juvenile cod in experimental vertical temperature and light gradients |
title_short |
Effect of food deprivation on distribution of larval and early juvenile cod in experimental vertical temperature and light gradients |
title_full |
Effect of food deprivation on distribution of larval and early juvenile cod in experimental vertical temperature and light gradients |
title_fullStr |
Effect of food deprivation on distribution of larval and early juvenile cod in experimental vertical temperature and light gradients |
title_full_unstemmed |
Effect of food deprivation on distribution of larval and early juvenile cod in experimental vertical temperature and light gradients |
title_sort |
effect of food deprivation on distribution of larval and early juvenile cod in experimental vertical temperature and light gradients |
publisher |
Inter-Research |
publishDate |
2013 |
url |
http://hdl.handle.net/11250/109255 https://doi.org/10.3354/meps10129 |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
191-201 475 Marine Ecology Progress Series |
op_relation |
Vollset KW, Catalán IA, Fiksen Ø, Folkvord A (2013) Effect of food deprivation on distribution of larval and early juvenile cod in experimental vertical temperature and light gradients. Mar Ecol Prog Ser 475:191-201 urn:issn:0171-8630 urn:issn:1616-1599 http://hdl.handle.net/11250/109255 https://doi.org/10.3354/meps10129 |
op_doi |
https://doi.org/10.3354/meps10129 |
container_title |
Marine Ecology Progress Series |
container_volume |
475 |
container_start_page |
191 |
op_container_end_page |
201 |
_version_ |
1766005753379815424 |