Allometry of diet selectivity in juvenile Atlantic salmon (Salmo salar)
Juvenile salmonids in streams typically feed on larger invertebrates than the average size available in the drift. Our objective was to describe the allometry of this size-selective foraging in juvenile Atlantic salmon, Salmo salar of Catamaran Brook, New Brunswick. We compared paired samples of the...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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1997
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Online Access: | http://dx.doi.org/10.1139/f97-096 http://www.nrcresearchpress.com/doi/pdf/10.1139/f97-096 |
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crcansciencepubl:10.1139/f97-096 2024-09-09T19:30:16+00:00 Allometry of diet selectivity in juvenile Atlantic salmon (Salmo salar) Keeley, E R Grant, JWA 1997 http://dx.doi.org/10.1139/f97-096 http://www.nrcresearchpress.com/doi/pdf/10.1139/f97-096 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 54, issue 8, page 1894-1902 ISSN 0706-652X 1205-7533 journal-article 1997 crcansciencepubl https://doi.org/10.1139/f97-096 2024-07-25T04:10:08Z Juvenile salmonids in streams typically feed on larger invertebrates than the average size available in the drift. Our objective was to describe the allometry of this size-selective foraging in juvenile Atlantic salmon, Salmo salar of Catamaran Brook, New Brunswick. We compared paired samples of the stomach contents of 46 salmon (age 0 + to 2 + fork length 2.9-14.5 cm) with drift samples collected from their feeding territories. Juvenile salmon fed opportunistically on all major types of invertebrates in the drift, except for water mites (Hydracarina). However, newly emerged salmon fed on smaller prey than the average available in the drift, primarily chironomid larvae, whereas salmon larger than 4.6 cm fed on larger prey than average, primarily dipteran adults and pupae. Larger salmon ate larger prey. Minimum prey length in stomachs was well predicted by gill raker spacing, but mean prey width was only one third of the optimal size and maximum prey width was much less than mouth width. The allometry of prey size appeared to be related primarily to an increase in size-selective foraging with increasing body size, rather than to morphological constraints. Juvenile Atlantic salmon in our study ate smaller prey than similar-sized salmonids in other studies. Article in Journal/Newspaper Atlantic salmon Salmo salar Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 54 8 1894 1902 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
Juvenile salmonids in streams typically feed on larger invertebrates than the average size available in the drift. Our objective was to describe the allometry of this size-selective foraging in juvenile Atlantic salmon, Salmo salar of Catamaran Brook, New Brunswick. We compared paired samples of the stomach contents of 46 salmon (age 0 + to 2 + fork length 2.9-14.5 cm) with drift samples collected from their feeding territories. Juvenile salmon fed opportunistically on all major types of invertebrates in the drift, except for water mites (Hydracarina). However, newly emerged salmon fed on smaller prey than the average available in the drift, primarily chironomid larvae, whereas salmon larger than 4.6 cm fed on larger prey than average, primarily dipteran adults and pupae. Larger salmon ate larger prey. Minimum prey length in stomachs was well predicted by gill raker spacing, but mean prey width was only one third of the optimal size and maximum prey width was much less than mouth width. The allometry of prey size appeared to be related primarily to an increase in size-selective foraging with increasing body size, rather than to morphological constraints. Juvenile Atlantic salmon in our study ate smaller prey than similar-sized salmonids in other studies. |
format |
Article in Journal/Newspaper |
author |
Keeley, E R Grant, JWA |
spellingShingle |
Keeley, E R Grant, JWA Allometry of diet selectivity in juvenile Atlantic salmon (Salmo salar) |
author_facet |
Keeley, E R Grant, JWA |
author_sort |
Keeley, E R |
title |
Allometry of diet selectivity in juvenile Atlantic salmon (Salmo salar) |
title_short |
Allometry of diet selectivity in juvenile Atlantic salmon (Salmo salar) |
title_full |
Allometry of diet selectivity in juvenile Atlantic salmon (Salmo salar) |
title_fullStr |
Allometry of diet selectivity in juvenile Atlantic salmon (Salmo salar) |
title_full_unstemmed |
Allometry of diet selectivity in juvenile Atlantic salmon (Salmo salar) |
title_sort |
allometry of diet selectivity in juvenile atlantic salmon (salmo salar) |
publisher |
Canadian Science Publishing |
publishDate |
1997 |
url |
http://dx.doi.org/10.1139/f97-096 http://www.nrcresearchpress.com/doi/pdf/10.1139/f97-096 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 54, issue 8, page 1894-1902 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f97-096 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
54 |
container_issue |
8 |
container_start_page |
1894 |
op_container_end_page |
1902 |
_version_ |
1809899265520041984 |