Gametogenesis in capelin, Mallotus villosus (Müller), in the northwest Atlantic Ocean
Capelin (Mallotus villosus) can be regarded as the most important prey item in the northwest Atlantic Ocean. The health and availability of this species are of fundamental importance for the successful growth and reproduction of many other fishes, whales, and birds. In spite of the clear need to und...
Published in: | Canadian Journal of Zoology |
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Language: | English |
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2003
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Online Access: | http://dx.doi.org/10.1139/z03-139 http://www.nrcresearchpress.com/doi/pdf/10.1139/z03-139 |
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crcansciencepubl:10.1139/z03-139 2024-04-07T07:54:56+00:00 Gametogenesis in capelin, Mallotus villosus (Müller), in the northwest Atlantic Ocean Flynn, S R Burton, M P.M 2003 http://dx.doi.org/10.1139/z03-139 http://www.nrcresearchpress.com/doi/pdf/10.1139/z03-139 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 81, issue 9, page 1511-1523 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2003 crcansciencepubl https://doi.org/10.1139/z03-139 2024-03-08T00:37:50Z Capelin (Mallotus villosus) can be regarded as the most important prey item in the northwest Atlantic Ocean. The health and availability of this species are of fundamental importance for the successful growth and reproduction of many other fishes, whales, and birds. In spite of the clear need to understand this species, the life history of the capelin, especially its reproductive biology, is not well understood. This study substantially improves our knowledge of the reproductive biology of capelin and should be of particular interest to resource managers and administrators. Capelin gonads were analysed over three successive seasons using fish collected during beach spawning (June and July 1993, July 1994, July 1995) or trawled between spawnings, with 11 separate samples (fall, winter, and spring from October 1993 to June 1995). Few immature fish were collected in the trawls; 13/130 (10%) males and 3/150 (2%) females. No recovering (postspawning) males were found in the trawls, but 8/150 (5.3%) recovering females were identified on the basis of large residual oocytes (ovulated or unovulated) and (or) (in the fall) a thicker ovarian wall. Recovering females were identified as late as 10 months post spawning on the basis of residual oocytes. The essential semelparity of males was supported by a lack of apparent spermatogonia during advanced spermatogenesis, whereas the females' capacity to spawn in a subsequent year (iteroparity) was confirmed by the presence of small nonvitellogenic oocytes when other cells were in late oogenesis, in addition to the identification of recovering fish. Oocytes were separable into four stages (potential year classes) and changes occurred in all oocyte stages throughout the cycle of oogenesis. Gametogenesis was more advanced in longer fish, indicating that larger fish spawn earlier than smaller fish. Article in Journal/Newspaper Northwest Atlantic Canadian Science Publishing Canadian Journal of Zoology 81 9 1511 1523 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Flynn, S R Burton, M P.M Gametogenesis in capelin, Mallotus villosus (Müller), in the northwest Atlantic Ocean |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Capelin (Mallotus villosus) can be regarded as the most important prey item in the northwest Atlantic Ocean. The health and availability of this species are of fundamental importance for the successful growth and reproduction of many other fishes, whales, and birds. In spite of the clear need to understand this species, the life history of the capelin, especially its reproductive biology, is not well understood. This study substantially improves our knowledge of the reproductive biology of capelin and should be of particular interest to resource managers and administrators. Capelin gonads were analysed over three successive seasons using fish collected during beach spawning (June and July 1993, July 1994, July 1995) or trawled between spawnings, with 11 separate samples (fall, winter, and spring from October 1993 to June 1995). Few immature fish were collected in the trawls; 13/130 (10%) males and 3/150 (2%) females. No recovering (postspawning) males were found in the trawls, but 8/150 (5.3%) recovering females were identified on the basis of large residual oocytes (ovulated or unovulated) and (or) (in the fall) a thicker ovarian wall. Recovering females were identified as late as 10 months post spawning on the basis of residual oocytes. The essential semelparity of males was supported by a lack of apparent spermatogonia during advanced spermatogenesis, whereas the females' capacity to spawn in a subsequent year (iteroparity) was confirmed by the presence of small nonvitellogenic oocytes when other cells were in late oogenesis, in addition to the identification of recovering fish. Oocytes were separable into four stages (potential year classes) and changes occurred in all oocyte stages throughout the cycle of oogenesis. Gametogenesis was more advanced in longer fish, indicating that larger fish spawn earlier than smaller fish. |
format |
Article in Journal/Newspaper |
author |
Flynn, S R Burton, M P.M |
author_facet |
Flynn, S R Burton, M P.M |
author_sort |
Flynn, S R |
title |
Gametogenesis in capelin, Mallotus villosus (Müller), in the northwest Atlantic Ocean |
title_short |
Gametogenesis in capelin, Mallotus villosus (Müller), in the northwest Atlantic Ocean |
title_full |
Gametogenesis in capelin, Mallotus villosus (Müller), in the northwest Atlantic Ocean |
title_fullStr |
Gametogenesis in capelin, Mallotus villosus (Müller), in the northwest Atlantic Ocean |
title_full_unstemmed |
Gametogenesis in capelin, Mallotus villosus (Müller), in the northwest Atlantic Ocean |
title_sort |
gametogenesis in capelin, mallotus villosus (müller), in the northwest atlantic ocean |
publisher |
Canadian Science Publishing |
publishDate |
2003 |
url |
http://dx.doi.org/10.1139/z03-139 http://www.nrcresearchpress.com/doi/pdf/10.1139/z03-139 |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_source |
Canadian Journal of Zoology volume 81, issue 9, page 1511-1523 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z03-139 |
container_title |
Canadian Journal of Zoology |
container_volume |
81 |
container_issue |
9 |
container_start_page |
1511 |
op_container_end_page |
1523 |
_version_ |
1795671781140332544 |