Population fecundity and reproductive capacity of some food fishes in relation to year-class-strength fluctuations

Population fecundity (PF). i.e. the total number of eggs spawned by a population during the spawning season of a given year, is the fundamental criterion of the reproductive capacity of the population. PF is defined and calculated as a sum of the eggs spawned annually by fish of all age groups compo...

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Published in:ICES Journal of Marine Science
Main Author: Serebryakov, V. P.
Format: Text
Language:English
Published: Oxford University Press 1990
Subjects:
Online Access:http://icesjms.oxfordjournals.org/cgi/content/short/47/2/267
https://doi.org/10.1093/icesjms/47.2.267
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spelling fthighwire:oai:open-archive.highwire.org:icesjms:47/2/267 2023-05-15T14:30:31+02:00 Population fecundity and reproductive capacity of some food fishes in relation to year-class-strength fluctuations Serebryakov, V. P. 1990-01-01 00:00:00.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/47/2/267 https://doi.org/10.1093/icesjms/47.2.267 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/47/2/267 http://dx.doi.org/10.1093/icesjms/47.2.267 Copyright (C) 1990, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Mini-Symposium 1989 TEXT 1990 fthighwire https://doi.org/10.1093/icesjms/47.2.267 2013-05-27T21:43:03Z Population fecundity (PF). i.e. the total number of eggs spawned by a population during the spawning season of a given year, is the fundamental criterion of the reproductive capacity of the population. PF is defined and calculated as a sum of the eggs spawned annually by fish of all age groups composing the spawning section of a population. PF was estimated for Norwegian spring-spawning herring. Barents Sea capelin, and Northeast Arctic cod. Values of PF varied over ranges × 5 in capelin. × 10 in cod. and × 100 in herring. The ratio of the number of fish which survive to age 3 to the total number of eggs spawned in a given year is taken to be an integrated indicator of survival conditions during these first three years of life, and defined as the survival factor (S). The highest S fluctuations of above two orders of magnitude were recorded in herring, whereas in cod and capelin the ranges were 1.5 and 1 order of magnitude, respectively. Average values of S were estimated as 15.9. and 147 fish of age 3 per million eggs in herring, cod. and capelin, respectively. Historical assessment of PF, year-class strength, and S enables the following three levels of reproductive capacity to be identified: (1) safe level, guaranteeing the production of a strong year class under average survival condition during early life; (2) minimal required, implying year-class-abundance fluctuations around the long-term mean; and (3) critical level of population fecundity, posing a real danger of a long-term decline in abundance. These three levels of reproductive capacity are recommended for use as a reference framework when formulating regulatory measures designed to ensure the continuity of an adequate spawning stock. Text Arctic cod Arctic Barents Sea Northeast Arctic cod HighWire Press (Stanford University) Arctic Barents Sea ICES Journal of Marine Science 47 2 267 272
institution Open Polar
collection HighWire Press (Stanford University)
op_collection_id fthighwire
language English
topic Mini-Symposium
1989
spellingShingle Mini-Symposium
1989
Serebryakov, V. P.
Population fecundity and reproductive capacity of some food fishes in relation to year-class-strength fluctuations
topic_facet Mini-Symposium
1989
description Population fecundity (PF). i.e. the total number of eggs spawned by a population during the spawning season of a given year, is the fundamental criterion of the reproductive capacity of the population. PF is defined and calculated as a sum of the eggs spawned annually by fish of all age groups composing the spawning section of a population. PF was estimated for Norwegian spring-spawning herring. Barents Sea capelin, and Northeast Arctic cod. Values of PF varied over ranges × 5 in capelin. × 10 in cod. and × 100 in herring. The ratio of the number of fish which survive to age 3 to the total number of eggs spawned in a given year is taken to be an integrated indicator of survival conditions during these first three years of life, and defined as the survival factor (S). The highest S fluctuations of above two orders of magnitude were recorded in herring, whereas in cod and capelin the ranges were 1.5 and 1 order of magnitude, respectively. Average values of S were estimated as 15.9. and 147 fish of age 3 per million eggs in herring, cod. and capelin, respectively. Historical assessment of PF, year-class strength, and S enables the following three levels of reproductive capacity to be identified: (1) safe level, guaranteeing the production of a strong year class under average survival condition during early life; (2) minimal required, implying year-class-abundance fluctuations around the long-term mean; and (3) critical level of population fecundity, posing a real danger of a long-term decline in abundance. These three levels of reproductive capacity are recommended for use as a reference framework when formulating regulatory measures designed to ensure the continuity of an adequate spawning stock.
format Text
author Serebryakov, V. P.
author_facet Serebryakov, V. P.
author_sort Serebryakov, V. P.
title Population fecundity and reproductive capacity of some food fishes in relation to year-class-strength fluctuations
title_short Population fecundity and reproductive capacity of some food fishes in relation to year-class-strength fluctuations
title_full Population fecundity and reproductive capacity of some food fishes in relation to year-class-strength fluctuations
title_fullStr Population fecundity and reproductive capacity of some food fishes in relation to year-class-strength fluctuations
title_full_unstemmed Population fecundity and reproductive capacity of some food fishes in relation to year-class-strength fluctuations
title_sort population fecundity and reproductive capacity of some food fishes in relation to year-class-strength fluctuations
publisher Oxford University Press
publishDate 1990
url http://icesjms.oxfordjournals.org/cgi/content/short/47/2/267
https://doi.org/10.1093/icesjms/47.2.267
geographic Arctic
Barents Sea
geographic_facet Arctic
Barents Sea
genre Arctic cod
Arctic
Barents Sea
Northeast Arctic cod
genre_facet Arctic cod
Arctic
Barents Sea
Northeast Arctic cod
op_relation http://icesjms.oxfordjournals.org/cgi/content/short/47/2/267
http://dx.doi.org/10.1093/icesjms/47.2.267
op_rights Copyright (C) 1990, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
op_doi https://doi.org/10.1093/icesjms/47.2.267
container_title ICES Journal of Marine Science
container_volume 47
container_issue 2
container_start_page 267
op_container_end_page 272
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