Egg production of Baltic cod (Gadus morhua) in relation to variable sex ratio, maturity, and fecundity
Observed fluctuations in relative fecundity of Eastern Baltic cod (Gadus morhua L.) were related to food availability during the main feeding period and were used to develop a predictive model that explained 72% of the interannual variations in fecundity. Time series of sex ratios, maturity ogives,...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2002
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Online Access: | https://oceanrep.geomar.de/id/eprint/7504/ https://oceanrep.geomar.de/id/eprint/7504/1/f02-159.pdf https://doi.org/10.1139/F02-159 |
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ftoceanrep:oai:oceanrep.geomar.de:7504 2023-05-15T16:19:00+02:00 Egg production of Baltic cod (Gadus morhua) in relation to variable sex ratio, maturity, and fecundity Kraus, Gerd Tomkiewicz, Jonna Köster, Friedrich 2002 text https://oceanrep.geomar.de/id/eprint/7504/ https://oceanrep.geomar.de/id/eprint/7504/1/f02-159.pdf https://doi.org/10.1139/F02-159 en eng NRC https://oceanrep.geomar.de/id/eprint/7504/1/f02-159.pdf Kraus, G., Tomkiewicz, J. and Köster, F. (2002) Egg production of Baltic cod (Gadus morhua) in relation to variable sex ratio, maturity, and fecundity. Open Access Canadian Journal of Fisheries and Aquatic Sciences, 59 . pp. 1908-1920. DOI 10.1139/F02-159 <https://doi.org/10.1139/F02-159>. doi:10.1139/F02-159 info:eu-repo/semantics/openAccess Article PeerReviewed 2002 ftoceanrep https://doi.org/10.1139/F02-159 2023-04-07T14:54:56Z Observed fluctuations in relative fecundity of Eastern Baltic cod (Gadus morhua L.) were related to food availability during the main feeding period and were used to develop a predictive model that explained 72% of the interannual variations in fecundity. Time series of sex ratios, maturity ogives, and relative fecundity were combined with mean weights-at-age and stock sizes from an analytical multispecies model to estimate the potential egg production (PEP). Relationships between PEP and independent estimates of realized daily and seasonal egg production from egg surveys were highly significant. The difference between estimates of potential and realized seasonal egg production was of a magnitude corresponding to the expected loss of eggs as a result of atresia, fertilization failure, and early egg mortality. The removal of interannual variability in sex ratio, maturity, and fecundity on estimates of PEP deteriorated the relationships in all three cases. PEP proved to be superior to spawning stock biomass as measure of the reproductive potential in a stock-recruitment relationship of Eastern Baltic cod. PEP in combination with the reproductive volume explained 61% of the variation in year-class strength at age 2. Article in Journal/Newspaper Gadus morhua OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Canadian Journal of Fisheries and Aquatic Sciences 59 12 1908 1920 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Observed fluctuations in relative fecundity of Eastern Baltic cod (Gadus morhua L.) were related to food availability during the main feeding period and were used to develop a predictive model that explained 72% of the interannual variations in fecundity. Time series of sex ratios, maturity ogives, and relative fecundity were combined with mean weights-at-age and stock sizes from an analytical multispecies model to estimate the potential egg production (PEP). Relationships between PEP and independent estimates of realized daily and seasonal egg production from egg surveys were highly significant. The difference between estimates of potential and realized seasonal egg production was of a magnitude corresponding to the expected loss of eggs as a result of atresia, fertilization failure, and early egg mortality. The removal of interannual variability in sex ratio, maturity, and fecundity on estimates of PEP deteriorated the relationships in all three cases. PEP proved to be superior to spawning stock biomass as measure of the reproductive potential in a stock-recruitment relationship of Eastern Baltic cod. PEP in combination with the reproductive volume explained 61% of the variation in year-class strength at age 2. |
format |
Article in Journal/Newspaper |
author |
Kraus, Gerd Tomkiewicz, Jonna Köster, Friedrich |
spellingShingle |
Kraus, Gerd Tomkiewicz, Jonna Köster, Friedrich Egg production of Baltic cod (Gadus morhua) in relation to variable sex ratio, maturity, and fecundity |
author_facet |
Kraus, Gerd Tomkiewicz, Jonna Köster, Friedrich |
author_sort |
Kraus, Gerd |
title |
Egg production of Baltic cod (Gadus morhua) in relation to variable sex ratio, maturity, and fecundity |
title_short |
Egg production of Baltic cod (Gadus morhua) in relation to variable sex ratio, maturity, and fecundity |
title_full |
Egg production of Baltic cod (Gadus morhua) in relation to variable sex ratio, maturity, and fecundity |
title_fullStr |
Egg production of Baltic cod (Gadus morhua) in relation to variable sex ratio, maturity, and fecundity |
title_full_unstemmed |
Egg production of Baltic cod (Gadus morhua) in relation to variable sex ratio, maturity, and fecundity |
title_sort |
egg production of baltic cod (gadus morhua) in relation to variable sex ratio, maturity, and fecundity |
publisher |
NRC |
publishDate |
2002 |
url |
https://oceanrep.geomar.de/id/eprint/7504/ https://oceanrep.geomar.de/id/eprint/7504/1/f02-159.pdf https://doi.org/10.1139/F02-159 |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_relation |
https://oceanrep.geomar.de/id/eprint/7504/1/f02-159.pdf Kraus, G., Tomkiewicz, J. and Köster, F. (2002) Egg production of Baltic cod (Gadus morhua) in relation to variable sex ratio, maturity, and fecundity. Open Access Canadian Journal of Fisheries and Aquatic Sciences, 59 . pp. 1908-1920. DOI 10.1139/F02-159 <https://doi.org/10.1139/F02-159>. doi:10.1139/F02-159 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1139/F02-159 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
59 |
container_issue |
12 |
container_start_page |
1908 |
op_container_end_page |
1920 |
_version_ |
1766005297469456384 |