Growth and maturation of cod (Gadus morhua) of different year-classes in the northwest Atlantic, NAFO subdivision 3Ps
Using data collected in fishery-independent bottom-trawl surveys of cod in NAFO subdivision 3Ps, we examine (1) the variations in growth and maturation of cod among year classes from 1969 to 1990 and (2) inter-relationships between growth and maturation of cod. To reduce impacts of outliers on data...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.541.1594 2023-05-15T16:19:09+02:00 Growth and maturation of cod (Gadus morhua) of different year-classes in the northwest Atlantic, NAFO subdivision 3Ps Y. Chen L. G. S. Mello The Pennsylvania State University CiteSeerX Archives 1999 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.541.1594 http://www.umaine.edu/marine/people/sites/ychen/publication_papers/chen_mello_fisheries_research_cod_ggrowth_1999.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.541.1594 http://www.umaine.edu/marine/people/sites/ychen/publication_papers/chen_mello_fisheries_research_cod_ggrowth_1999.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.umaine.edu/marine/people/sites/ychen/publication_papers/chen_mello_fisheries_research_cod_ggrowth_1999.pdf text 1999 ftciteseerx 2016-01-08T11:04:21Z Using data collected in fishery-independent bottom-trawl surveys of cod in NAFO subdivision 3Ps, we examine (1) the variations in growth and maturation of cod among year classes from 1969 to 1990 and (2) inter-relationships between growth and maturation of cod. To reduce impacts of outliers on data analyses, a robust maximum likelihood estimator is used to fit the von Bertalanffy growth function to size-at-age data. An overall indicator for pre-maturity growth of cod is developed using a robust principal component analysis. This study suggests that cod born during 1980s have smaller length-at-age values when compared with cod born in 1970s. The age at maturity declined steadily from the highest of 7 yr old for the 1981 year-class to 5 yr old for the 1990 year-class. Growth and maturation were significantly related to each other. A cohort of cod that had a higher growth rate in their young ages tended to mature earlier. The impacts of the findings in this study on the management of Text Gadus morhua Northwest Atlantic Unknown |
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English |
description |
Using data collected in fishery-independent bottom-trawl surveys of cod in NAFO subdivision 3Ps, we examine (1) the variations in growth and maturation of cod among year classes from 1969 to 1990 and (2) inter-relationships between growth and maturation of cod. To reduce impacts of outliers on data analyses, a robust maximum likelihood estimator is used to fit the von Bertalanffy growth function to size-at-age data. An overall indicator for pre-maturity growth of cod is developed using a robust principal component analysis. This study suggests that cod born during 1980s have smaller length-at-age values when compared with cod born in 1970s. The age at maturity declined steadily from the highest of 7 yr old for the 1981 year-class to 5 yr old for the 1990 year-class. Growth and maturation were significantly related to each other. A cohort of cod that had a higher growth rate in their young ages tended to mature earlier. The impacts of the findings in this study on the management of |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Y. Chen L. G. S. Mello |
spellingShingle |
Y. Chen L. G. S. Mello Growth and maturation of cod (Gadus morhua) of different year-classes in the northwest Atlantic, NAFO subdivision 3Ps |
author_facet |
Y. Chen L. G. S. Mello |
author_sort |
Y. Chen |
title |
Growth and maturation of cod (Gadus morhua) of different year-classes in the northwest Atlantic, NAFO subdivision 3Ps |
title_short |
Growth and maturation of cod (Gadus morhua) of different year-classes in the northwest Atlantic, NAFO subdivision 3Ps |
title_full |
Growth and maturation of cod (Gadus morhua) of different year-classes in the northwest Atlantic, NAFO subdivision 3Ps |
title_fullStr |
Growth and maturation of cod (Gadus morhua) of different year-classes in the northwest Atlantic, NAFO subdivision 3Ps |
title_full_unstemmed |
Growth and maturation of cod (Gadus morhua) of different year-classes in the northwest Atlantic, NAFO subdivision 3Ps |
title_sort |
growth and maturation of cod (gadus morhua) of different year-classes in the northwest atlantic, nafo subdivision 3ps |
publishDate |
1999 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.541.1594 http://www.umaine.edu/marine/people/sites/ychen/publication_papers/chen_mello_fisheries_research_cod_ggrowth_1999.pdf |
genre |
Gadus morhua Northwest Atlantic |
genre_facet |
Gadus morhua Northwest Atlantic |
op_source |
http://www.umaine.edu/marine/people/sites/ychen/publication_papers/chen_mello_fisheries_research_cod_ggrowth_1999.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.541.1594 http://www.umaine.edu/marine/people/sites/ychen/publication_papers/chen_mello_fisheries_research_cod_ggrowth_1999.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766005478092963840 |