Reproduction in Antarctic notothenioid fish
Gonad maturation in Antarctic notothenioid fish is a biennial process although spawning is likely to take place annually. However, part of the populations of Champsocephalus gunnari in the Atlantic Ocean sector do not spawn each year. Gonadosomatic index (GSI) of females is 15–40% at spawning. Apart...
Published in: | Antarctic Science |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
1991
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1017/s0954102091000172 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102091000172 |
id |
crcambridgeupr:10.1017/s0954102091000172 |
---|---|
record_format |
openpolar |
spelling |
crcambridgeupr:10.1017/s0954102091000172 2024-09-30T14:25:34+00:00 Reproduction in Antarctic notothenioid fish Kock, Karl-Hermann Kellermann, Adolf 1991 http://dx.doi.org/10.1017/s0954102091000172 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102091000172 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 3, issue 2, page 125-150 ISSN 0954-1020 1365-2079 journal-article 1991 crcambridgeupr https://doi.org/10.1017/s0954102091000172 2024-09-11T04:05:12Z Gonad maturation in Antarctic notothenioid fish is a biennial process although spawning is likely to take place annually. However, part of the populations of Champsocephalus gunnari in the Atlantic Ocean sector do not spawn each year. Gonadosomatic index (GSI) of females is 15–40% at spawning. Apart from a few nototheniid species of the GSI of males is much less and typically only 15–20% of that of females. Length at first spawning may be from 55% of L max onwards, but in many species it is not attained until 70–80% of the maximum length. The only exception is Champsocephalus gunnari at South Georgia which may begin spawning at about 40% of L max . Most species of the Seasonal Pack-ice Zone are autumn/winter spawners, whereas in the High-Antarctic Zone more species spawn in summer and autumn. Spawning time is remarkably constant among populations of some species, in others a latitudinal shift in spawning time is apparent. Fecundity is commonly positively correlated with fish length and weight. It exceeds 100 000 eggs only in a few nototheniid species and is commonly in the order of 1000 to 15–20 000 eggs. Ova diameter varies from 0.8 to 5.0 mm. Egg size distribution among fishes of the Seasonal Pack-ice Zone is bimodal. There is a general trend in nototheniids of increasing egg size and decreasing relative fecundity towards higher latitudes. Incubation time may be up to five months. Eggs of most species are probably left unattended for the long incubation period. Nest guarding has been observed in three species but may be more common in particular among the artedidraconids. A number of reproductive strategies associated with nest guarding, egg size and the duration of the pelagic phase have been identified. Article in Journal/Newspaper Antarc* Antarctic Antarctic Science Cambridge University Press Antarctic Antarctic Science 3 2 125 150 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Gonad maturation in Antarctic notothenioid fish is a biennial process although spawning is likely to take place annually. However, part of the populations of Champsocephalus gunnari in the Atlantic Ocean sector do not spawn each year. Gonadosomatic index (GSI) of females is 15–40% at spawning. Apart from a few nototheniid species of the GSI of males is much less and typically only 15–20% of that of females. Length at first spawning may be from 55% of L max onwards, but in many species it is not attained until 70–80% of the maximum length. The only exception is Champsocephalus gunnari at South Georgia which may begin spawning at about 40% of L max . Most species of the Seasonal Pack-ice Zone are autumn/winter spawners, whereas in the High-Antarctic Zone more species spawn in summer and autumn. Spawning time is remarkably constant among populations of some species, in others a latitudinal shift in spawning time is apparent. Fecundity is commonly positively correlated with fish length and weight. It exceeds 100 000 eggs only in a few nototheniid species and is commonly in the order of 1000 to 15–20 000 eggs. Ova diameter varies from 0.8 to 5.0 mm. Egg size distribution among fishes of the Seasonal Pack-ice Zone is bimodal. There is a general trend in nototheniids of increasing egg size and decreasing relative fecundity towards higher latitudes. Incubation time may be up to five months. Eggs of most species are probably left unattended for the long incubation period. Nest guarding has been observed in three species but may be more common in particular among the artedidraconids. A number of reproductive strategies associated with nest guarding, egg size and the duration of the pelagic phase have been identified. |
format |
Article in Journal/Newspaper |
author |
Kock, Karl-Hermann Kellermann, Adolf |
spellingShingle |
Kock, Karl-Hermann Kellermann, Adolf Reproduction in Antarctic notothenioid fish |
author_facet |
Kock, Karl-Hermann Kellermann, Adolf |
author_sort |
Kock, Karl-Hermann |
title |
Reproduction in Antarctic notothenioid fish |
title_short |
Reproduction in Antarctic notothenioid fish |
title_full |
Reproduction in Antarctic notothenioid fish |
title_fullStr |
Reproduction in Antarctic notothenioid fish |
title_full_unstemmed |
Reproduction in Antarctic notothenioid fish |
title_sort |
reproduction in antarctic notothenioid fish |
publisher |
Cambridge University Press (CUP) |
publishDate |
1991 |
url |
http://dx.doi.org/10.1017/s0954102091000172 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102091000172 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctic Science |
genre_facet |
Antarc* Antarctic Antarctic Science |
op_source |
Antarctic Science volume 3, issue 2, page 125-150 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102091000172 |
container_title |
Antarctic Science |
container_volume |
3 |
container_issue |
2 |
container_start_page |
125 |
op_container_end_page |
150 |
_version_ |
1811645553867489280 |