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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1990
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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 |
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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 |
_version_ |
1766304350893768704 |