The biology and fishery of American plaice (Hippoglossoides platessoides [Fabricius]) with special reference to the Grand Bank
Thesis (Ph.D.)--Memorial University of Newfoundland, 1976. Biology Bibliography: leaves 155-160 American plaice (Hippaglossoides platessoides) is widely distributed throughout the Northwest Atlantic with the Grand Bank supporting the largest population. Meristics indicated possibly considerable inte...
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ftmemorialunivdc:oai:collections.mun.ca:theses3/154786 2023-05-15T17:23:32+02:00 The biology and fishery of American plaice (Hippoglossoides platessoides [Fabricius]) with special reference to the Grand Bank Pitt, Thomas Kenton Memorial University of Newfoundland. Dept. of Biology Grand Banks of Newfoundland 1975 xiii, 171 leaves : ill. Image/jpeg; Application/pdf http://collections.mun.ca/cdm/ref/collection/theses3/id/154786 eng eng Electronic Theses and Dissertations (32.48 MB) -- http://collections.mun.ca/PDFs/theses/Pitt_ThomasKenton.pdf 76006190 http://collections.mun.ca/cdm/ref/collection/theses3/id/154786 The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries Plaice Fisheries--Grand Banks of Newfoundland Text Electronic thesis or dissertation 1975 ftmemorialunivdc 2015-08-06T19:20:21Z Thesis (Ph.D.)--Memorial University of Newfoundland, 1976. Biology Bibliography: leaves 155-160 American plaice (Hippaglossoides platessoides) is widely distributed throughout the Northwest Atlantic with the Grand Bank supporting the largest population. Meristics indicated possibly considerable intermingling during pre- metamorphosis stages, but on the Grand Bank, at least, tagging and growth data suggested little intermingling beyond the early life-history stages. Length-age comparisons, indicated considerable differences between localities and also gave positive correlations between average length at ages 5 and 15 and probable bottom temperature. -- Peak spawning occurred from early April on Flemish Cap to early June off Northeast Newfoundland and Labrador. Fifty percent (50%) sexual maturity for different localities occurred at 7.8-12.2 years for females and 5.3-7.6 years for males. -- Log-log relationships were established between fecundity and fish length, gutted and gilled weight and age for Grand Bank samples. No differences were found between fecundity- length relationships for different parts of the Grand Bank. – Although invertebrates, principally benthic forms occurred most frequently in plaice stomachs from the Grand Bank capelin and lance made up a major part of the total food weight and were especially important for the southern Grand Bank. -- Landings of Grand Bank plaice increased from the early 1950’s and reached a peak in 1966-68 with a subsequent gradual decline. Increased exploitation was reflected in declines in catch per hour, stock abundance and fishing mortality rates. Stock assessments suggested that removals in the immediate future may be lower than in previous years. However, because of non-reporting of discards of plaice, prediction of yield is difficult. -- Average length at age increased from the early 1950’s to the 1970’s apparently-because of increased rate of growth in the early years of life and coupled with this was a decline in age at sexual maturity. Significant correlations were found between stock size ,asymptotic length and size at age 5 and 10 years for the northern half of the Grand Bank. Thesis Newfoundland studies Northwest Atlantic University of Newfoundland Memorial University of Newfoundland: Digital Archives Initiative (DAI) Newfoundland |
institution |
Open Polar |
collection |
Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
op_collection_id |
ftmemorialunivdc |
language |
English |
topic |
Plaice Fisheries--Grand Banks of Newfoundland |
spellingShingle |
Plaice Fisheries--Grand Banks of Newfoundland Pitt, Thomas Kenton The biology and fishery of American plaice (Hippoglossoides platessoides [Fabricius]) with special reference to the Grand Bank |
topic_facet |
Plaice Fisheries--Grand Banks of Newfoundland |
description |
Thesis (Ph.D.)--Memorial University of Newfoundland, 1976. Biology Bibliography: leaves 155-160 American plaice (Hippaglossoides platessoides) is widely distributed throughout the Northwest Atlantic with the Grand Bank supporting the largest population. Meristics indicated possibly considerable intermingling during pre- metamorphosis stages, but on the Grand Bank, at least, tagging and growth data suggested little intermingling beyond the early life-history stages. Length-age comparisons, indicated considerable differences between localities and also gave positive correlations between average length at ages 5 and 15 and probable bottom temperature. -- Peak spawning occurred from early April on Flemish Cap to early June off Northeast Newfoundland and Labrador. Fifty percent (50%) sexual maturity for different localities occurred at 7.8-12.2 years for females and 5.3-7.6 years for males. -- Log-log relationships were established between fecundity and fish length, gutted and gilled weight and age for Grand Bank samples. No differences were found between fecundity- length relationships for different parts of the Grand Bank. – Although invertebrates, principally benthic forms occurred most frequently in plaice stomachs from the Grand Bank capelin and lance made up a major part of the total food weight and were especially important for the southern Grand Bank. -- Landings of Grand Bank plaice increased from the early 1950’s and reached a peak in 1966-68 with a subsequent gradual decline. Increased exploitation was reflected in declines in catch per hour, stock abundance and fishing mortality rates. Stock assessments suggested that removals in the immediate future may be lower than in previous years. However, because of non-reporting of discards of plaice, prediction of yield is difficult. -- Average length at age increased from the early 1950’s to the 1970’s apparently-because of increased rate of growth in the early years of life and coupled with this was a decline in age at sexual maturity. Significant correlations were found between stock size ,asymptotic length and size at age 5 and 10 years for the northern half of the Grand Bank. |
author2 |
Memorial University of Newfoundland. Dept. of Biology |
format |
Thesis |
author |
Pitt, Thomas Kenton |
author_facet |
Pitt, Thomas Kenton |
author_sort |
Pitt, Thomas Kenton |
title |
The biology and fishery of American plaice (Hippoglossoides platessoides [Fabricius]) with special reference to the Grand Bank |
title_short |
The biology and fishery of American plaice (Hippoglossoides platessoides [Fabricius]) with special reference to the Grand Bank |
title_full |
The biology and fishery of American plaice (Hippoglossoides platessoides [Fabricius]) with special reference to the Grand Bank |
title_fullStr |
The biology and fishery of American plaice (Hippoglossoides platessoides [Fabricius]) with special reference to the Grand Bank |
title_full_unstemmed |
The biology and fishery of American plaice (Hippoglossoides platessoides [Fabricius]) with special reference to the Grand Bank |
title_sort |
biology and fishery of american plaice (hippoglossoides platessoides [fabricius]) with special reference to the grand bank |
publishDate |
1975 |
url |
http://collections.mun.ca/cdm/ref/collection/theses3/id/154786 |
op_coverage |
Grand Banks of Newfoundland |
geographic |
Newfoundland |
geographic_facet |
Newfoundland |
genre |
Newfoundland studies Northwest Atlantic University of Newfoundland |
genre_facet |
Newfoundland studies Northwest Atlantic University of Newfoundland |
op_source |
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries |
op_relation |
Electronic Theses and Dissertations (32.48 MB) -- http://collections.mun.ca/PDFs/theses/Pitt_ThomasKenton.pdf 76006190 http://collections.mun.ca/cdm/ref/collection/theses3/id/154786 |
op_rights |
The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. |
_version_ |
1766113157098504192 |