Density-dependent distribution of demersal juvenile Atlantic cod (Gadus morhua) in Placentia Bay, Newfoundland
Abstract Age 0 cod (Gadus morhua) were surveyed with beach-seines monthly from September to December, 1997–1999, at sites located throughout Placentia Bay, Newfoundland. Catch rates (densities) varied annually, being highest in 1998 (7 fish per sample) and lowest in 1997 (<1). Each year, fish siz...
Published in: | ICES Journal of Marine Science |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Oxford University Press (OUP)
2006
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1016/j.icesjms.2005.12.002 http://academic.oup.com/icesjms/article-pdf/63/4/766/29126031/63-4-766.pdf |
id |
croxfordunivpr:10.1016/j.icesjms.2005.12.002 |
---|---|
record_format |
openpolar |
spelling |
croxfordunivpr:10.1016/j.icesjms.2005.12.002 2023-12-31T10:04:36+01:00 Density-dependent distribution of demersal juvenile Atlantic cod (Gadus morhua) in Placentia Bay, Newfoundland Robichaud, David Rose, George A. 2006 http://dx.doi.org/10.1016/j.icesjms.2005.12.002 http://academic.oup.com/icesjms/article-pdf/63/4/766/29126031/63-4-766.pdf en eng Oxford University Press (OUP) ICES Journal of Marine Science volume 63, issue 4, page 766-774 ISSN 1095-9289 1054-3139 Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2006 croxfordunivpr https://doi.org/10.1016/j.icesjms.2005.12.002 2023-12-06T09:02:19Z Abstract Age 0 cod (Gadus morhua) were surveyed with beach-seines monthly from September to December, 1997–1999, at sites located throughout Placentia Bay, Newfoundland. Catch rates (densities) varied annually, being highest in 1998 (7 fish per sample) and lowest in 1997 (<1). Each year, fish size and density increased from September to November, as expected from a stock that tends to produce a single cohort spawned in April/May. However, in December the expected larger fish were absent, and the presence of smaller cod suggested a later cohort (July spawning). Large-scale spatial patterns also persisted among years, with densities consistently higher in the inner bay and on the western side, and lower on the eastern side. The rank of the sites from greatest to lowest density of age 0 cod remained fairly consistent among years. In a comparison of all 12 sampling events, the proportion of sites occupied by cod was strongly and positively correlated with the total number caught (r2 = 0.95). These observations suggested a density-dependent range expansion not previously reported for age 0 cod. Article in Journal/Newspaper atlantic cod Gadus morhua Newfoundland Oxford University Press (via Crossref) ICES Journal of Marine Science 63 4 766 774 |
institution |
Open Polar |
collection |
Oxford University Press (via Crossref) |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography Robichaud, David Rose, George A. Density-dependent distribution of demersal juvenile Atlantic cod (Gadus morhua) in Placentia Bay, Newfoundland |
topic_facet |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract Age 0 cod (Gadus morhua) were surveyed with beach-seines monthly from September to December, 1997–1999, at sites located throughout Placentia Bay, Newfoundland. Catch rates (densities) varied annually, being highest in 1998 (7 fish per sample) and lowest in 1997 (<1). Each year, fish size and density increased from September to November, as expected from a stock that tends to produce a single cohort spawned in April/May. However, in December the expected larger fish were absent, and the presence of smaller cod suggested a later cohort (July spawning). Large-scale spatial patterns also persisted among years, with densities consistently higher in the inner bay and on the western side, and lower on the eastern side. The rank of the sites from greatest to lowest density of age 0 cod remained fairly consistent among years. In a comparison of all 12 sampling events, the proportion of sites occupied by cod was strongly and positively correlated with the total number caught (r2 = 0.95). These observations suggested a density-dependent range expansion not previously reported for age 0 cod. |
format |
Article in Journal/Newspaper |
author |
Robichaud, David Rose, George A. |
author_facet |
Robichaud, David Rose, George A. |
author_sort |
Robichaud, David |
title |
Density-dependent distribution of demersal juvenile Atlantic cod (Gadus morhua) in Placentia Bay, Newfoundland |
title_short |
Density-dependent distribution of demersal juvenile Atlantic cod (Gadus morhua) in Placentia Bay, Newfoundland |
title_full |
Density-dependent distribution of demersal juvenile Atlantic cod (Gadus morhua) in Placentia Bay, Newfoundland |
title_fullStr |
Density-dependent distribution of demersal juvenile Atlantic cod (Gadus morhua) in Placentia Bay, Newfoundland |
title_full_unstemmed |
Density-dependent distribution of demersal juvenile Atlantic cod (Gadus morhua) in Placentia Bay, Newfoundland |
title_sort |
density-dependent distribution of demersal juvenile atlantic cod (gadus morhua) in placentia bay, newfoundland |
publisher |
Oxford University Press (OUP) |
publishDate |
2006 |
url |
http://dx.doi.org/10.1016/j.icesjms.2005.12.002 http://academic.oup.com/icesjms/article-pdf/63/4/766/29126031/63-4-766.pdf |
genre |
atlantic cod Gadus morhua Newfoundland |
genre_facet |
atlantic cod Gadus morhua Newfoundland |
op_source |
ICES Journal of Marine Science volume 63, issue 4, page 766-774 ISSN 1095-9289 1054-3139 |
op_doi |
https://doi.org/10.1016/j.icesjms.2005.12.002 |
container_title |
ICES Journal of Marine Science |
container_volume |
63 |
container_issue |
4 |
container_start_page |
766 |
op_container_end_page |
774 |
_version_ |
1786834858244308992 |