Size-dependent foraging of larval Atlantic cod ( Gadus morhua)
Most marine fish larvae are thought to be gape-limited predators, and the presence of suitably sized prey at the appropriate time in the foraging environment is a key factor for their growth and survival. Two experiments were carried out: in experiment 1, we investigated feeding of Atlantic cod (Gad...
Published in: | Canadian Journal of Zoology |
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Online Access: | http://dx.doi.org/10.1139/z04-114 http://www.nrcresearchpress.com/doi/pdf/10.1139/z04-114 |
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crcansciencepubl:10.1139/z04-114 2024-09-15T17:55:28+00:00 Size-dependent foraging of larval Atlantic cod ( Gadus morhua) Puvanendran, Velmurugu Salies, Karine Laurel, Benjamin Brown, Joseph A 2004 http://dx.doi.org/10.1139/z04-114 http://www.nrcresearchpress.com/doi/pdf/10.1139/z04-114 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 82, issue 8, page 1380-1389 ISSN 0008-4301 1480-3283 journal-article 2004 crcansciencepubl https://doi.org/10.1139/z04-114 2024-07-25T04:10:08Z Most marine fish larvae are thought to be gape-limited predators, and the presence of suitably sized prey at the appropriate time in the foraging environment is a key factor for their growth and survival. Two experiments were carried out: in experiment 1, we investigated feeding of Atlantic cod (Gadus morhua L., 1758) larvae from 5 to 35 days post hatch on prey of three different sizes: two different-sized strains of rotifers, small rotifers (SR) and large rotifers (LR), and Artemia Leach, 1819 nauplii (AN), or an equal mixture of the three types of prey (MIX). In experiment 2, cod larvae were fed SR, LR, or a combination of SR and LR (MIX-R) at concentrations of 1500 and 4000 prey·L –1 from 4 to 20 days post hatch. Feeding incidence, number of prey in the gut, mouth gape, and prey selection were measured. In experiment 1, feeding incidence was initially higher in the SR treatment, while larvae failed to start feeding in either the LR or the AN treatment at 5 dph. Larvae in the LR treatment started feeding at 8 dph, and feeding incidence was comparable to that in the SR treatment, but the total number of prey eaten was higher in the SR than in the LR treatment until 20 dph. Larvae did not start feeding on AN until 26 dph, although they attacked them from 5 dph. In the MIX-R treatment in experiment 2, larvae fed selectively on LR at 4000 prey·L –1 , whereas no selection was observed at 1500 prey·L –1 . Our results suggest that cod larvae are gape-limited predators and the concentration of prey affects prey selection. Article in Journal/Newspaper atlantic cod Gadus morhua Canadian Science Publishing Canadian Journal of Zoology 82 8 1380 1389 |
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Canadian Science Publishing |
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English |
description |
Most marine fish larvae are thought to be gape-limited predators, and the presence of suitably sized prey at the appropriate time in the foraging environment is a key factor for their growth and survival. Two experiments were carried out: in experiment 1, we investigated feeding of Atlantic cod (Gadus morhua L., 1758) larvae from 5 to 35 days post hatch on prey of three different sizes: two different-sized strains of rotifers, small rotifers (SR) and large rotifers (LR), and Artemia Leach, 1819 nauplii (AN), or an equal mixture of the three types of prey (MIX). In experiment 2, cod larvae were fed SR, LR, or a combination of SR and LR (MIX-R) at concentrations of 1500 and 4000 prey·L –1 from 4 to 20 days post hatch. Feeding incidence, number of prey in the gut, mouth gape, and prey selection were measured. In experiment 1, feeding incidence was initially higher in the SR treatment, while larvae failed to start feeding in either the LR or the AN treatment at 5 dph. Larvae in the LR treatment started feeding at 8 dph, and feeding incidence was comparable to that in the SR treatment, but the total number of prey eaten was higher in the SR than in the LR treatment until 20 dph. Larvae did not start feeding on AN until 26 dph, although they attacked them from 5 dph. In the MIX-R treatment in experiment 2, larvae fed selectively on LR at 4000 prey·L –1 , whereas no selection was observed at 1500 prey·L –1 . Our results suggest that cod larvae are gape-limited predators and the concentration of prey affects prey selection. |
format |
Article in Journal/Newspaper |
author |
Puvanendran, Velmurugu Salies, Karine Laurel, Benjamin Brown, Joseph A |
spellingShingle |
Puvanendran, Velmurugu Salies, Karine Laurel, Benjamin Brown, Joseph A Size-dependent foraging of larval Atlantic cod ( Gadus morhua) |
author_facet |
Puvanendran, Velmurugu Salies, Karine Laurel, Benjamin Brown, Joseph A |
author_sort |
Puvanendran, Velmurugu |
title |
Size-dependent foraging of larval Atlantic cod ( Gadus morhua) |
title_short |
Size-dependent foraging of larval Atlantic cod ( Gadus morhua) |
title_full |
Size-dependent foraging of larval Atlantic cod ( Gadus morhua) |
title_fullStr |
Size-dependent foraging of larval Atlantic cod ( Gadus morhua) |
title_full_unstemmed |
Size-dependent foraging of larval Atlantic cod ( Gadus morhua) |
title_sort |
size-dependent foraging of larval atlantic cod ( gadus morhua) |
publisher |
Canadian Science Publishing |
publishDate |
2004 |
url |
http://dx.doi.org/10.1139/z04-114 http://www.nrcresearchpress.com/doi/pdf/10.1139/z04-114 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
Canadian Journal of Zoology volume 82, issue 8, page 1380-1389 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z04-114 |
container_title |
Canadian Journal of Zoology |
container_volume |
82 |
container_issue |
8 |
container_start_page |
1380 |
op_container_end_page |
1389 |
_version_ |
1810431751313424384 |