Recent Growth, Biochemical Composition and Prey Field of Larval Haddock ( Melanogrammus aeglefinus ) and Atlantic Cod ( Gadus morhua ) on Georges Bank
A transect across southern Georges Bank in May 1983 showed higher levels of available prey for haddock (Melanogrammus aeglefinus) and cod (Gadus morhua) larvae at two stratified sites than at a well-mixed site. At the stratified sites, prey biomass was high (30–300 μg dry wt∙L −1 ) near the surface...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
1987
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/f87-003 http://www.nrcresearchpress.com/doi/pdf/10.1139/f87-003 |
id |
crcansciencepubl:10.1139/f87-003 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/f87-003 2024-04-07T07:50:55+00:00 Recent Growth, Biochemical Composition and Prey Field of Larval Haddock ( Melanogrammus aeglefinus ) and Atlantic Cod ( Gadus morhua ) on Georges Bank Buckley, L. J. Lough, R. G. 1987 http://dx.doi.org/10.1139/f87-003 http://www.nrcresearchpress.com/doi/pdf/10.1139/f87-003 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 44, issue 1, page 14-25 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1987 crcansciencepubl https://doi.org/10.1139/f87-003 2024-03-08T00:37:33Z A transect across southern Georges Bank in May 1983 showed higher levels of available prey for haddock (Melanogrammus aeglefinus) and cod (Gadus morhua) larvae at two stratified sites than at a well-mixed site. At the stratified sites, prey biomass was high (30–300 μg dry wt∙L −1 ) near the surface above the thermocline; values were lower and more uniform with depth (10–30 μg dry wt∙L −1 ) at the well-mixed site. Larval population centers generally coincided with prey biomass vertically. Recent growth in dry weight of haddock larvae as estimated by RNA–DNA ratio analysis was higher at the stratified sites (8–13%∙d −1 ) than at the well-mixed site (7%∙d −1 ). Larvae appeared to be in excellent condition at the stratified sites, but up to 50% of haddock larvae from the well-mixed site had RNA–DNA ratios in the range observed for starved larvae in the laboratory. Cod collected at the same site were in better condition and growing faster than haddock. The data support the hypotheses that (1) stratified conditions in the spring favor good growth and survival of haddock larvae and (2) cod larvae are better adapted to grow and survive in well-mixed waters at lower levels of available food than haddock larvae. Article in Journal/Newspaper atlantic cod Gadus morhua Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 44 1 14 25 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Buckley, L. J. Lough, R. G. Recent Growth, Biochemical Composition and Prey Field of Larval Haddock ( Melanogrammus aeglefinus ) and Atlantic Cod ( Gadus morhua ) on Georges Bank |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
A transect across southern Georges Bank in May 1983 showed higher levels of available prey for haddock (Melanogrammus aeglefinus) and cod (Gadus morhua) larvae at two stratified sites than at a well-mixed site. At the stratified sites, prey biomass was high (30–300 μg dry wt∙L −1 ) near the surface above the thermocline; values were lower and more uniform with depth (10–30 μg dry wt∙L −1 ) at the well-mixed site. Larval population centers generally coincided with prey biomass vertically. Recent growth in dry weight of haddock larvae as estimated by RNA–DNA ratio analysis was higher at the stratified sites (8–13%∙d −1 ) than at the well-mixed site (7%∙d −1 ). Larvae appeared to be in excellent condition at the stratified sites, but up to 50% of haddock larvae from the well-mixed site had RNA–DNA ratios in the range observed for starved larvae in the laboratory. Cod collected at the same site were in better condition and growing faster than haddock. The data support the hypotheses that (1) stratified conditions in the spring favor good growth and survival of haddock larvae and (2) cod larvae are better adapted to grow and survive in well-mixed waters at lower levels of available food than haddock larvae. |
format |
Article in Journal/Newspaper |
author |
Buckley, L. J. Lough, R. G. |
author_facet |
Buckley, L. J. Lough, R. G. |
author_sort |
Buckley, L. J. |
title |
Recent Growth, Biochemical Composition and Prey Field of Larval Haddock ( Melanogrammus aeglefinus ) and Atlantic Cod ( Gadus morhua ) on Georges Bank |
title_short |
Recent Growth, Biochemical Composition and Prey Field of Larval Haddock ( Melanogrammus aeglefinus ) and Atlantic Cod ( Gadus morhua ) on Georges Bank |
title_full |
Recent Growth, Biochemical Composition and Prey Field of Larval Haddock ( Melanogrammus aeglefinus ) and Atlantic Cod ( Gadus morhua ) on Georges Bank |
title_fullStr |
Recent Growth, Biochemical Composition and Prey Field of Larval Haddock ( Melanogrammus aeglefinus ) and Atlantic Cod ( Gadus morhua ) on Georges Bank |
title_full_unstemmed |
Recent Growth, Biochemical Composition and Prey Field of Larval Haddock ( Melanogrammus aeglefinus ) and Atlantic Cod ( Gadus morhua ) on Georges Bank |
title_sort |
recent growth, biochemical composition and prey field of larval haddock ( melanogrammus aeglefinus ) and atlantic cod ( gadus morhua ) on georges bank |
publisher |
Canadian Science Publishing |
publishDate |
1987 |
url |
http://dx.doi.org/10.1139/f87-003 http://www.nrcresearchpress.com/doi/pdf/10.1139/f87-003 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 44, issue 1, page 14-25 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f87-003 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
44 |
container_issue |
1 |
container_start_page |
14 |
op_container_end_page |
25 |
_version_ |
1795665710911848448 |