Relationship between atresia, fish size and condition in Icelandic cod (Gadus morhua L.)
Cod is a determinate spawner, with a high potential fecundity. That is, a large definite number of oocytes start maturing prior to spawning. Environmental factors, such as water temperature and food availability have strong effects on nutritional status and fish size. Accumulation of energy prior to...
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ftimr:oai:imr.brage.unit.no:11250/100479 2023-05-15T16:19:07+02:00 Relationship between atresia, fish size and condition in Icelandic cod (Gadus morhua L.) Hardardottir, Kristin Kjesbu, Olav Sigurd Marteinsdottir, Gudrun 2001 163986 bytes application/pdf http://hdl.handle.net/11250/100479 eng eng ICES ICES CM documents 2001/J:19 http://hdl.handle.net/11250/100479 18 s. cod torsk VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 Working paper 2001 ftimr 2021-09-23T20:14:51Z Cod is a determinate spawner, with a high potential fecundity. That is, a large definite number of oocytes start maturing prior to spawning. Environmental factors, such as water temperature and food availability have strong effects on nutritional status and fish size. Accumulation of energy prior to spawning is important, as food intake during spawning is minimum. Fecundity is a changeable process that can be adjusted to the condition of the fish. Under favorable circumstances potential fecundity may be equivalent to the number of eggs spawned during the spawning season. When the environmental conditions are unfavorable some or all, developing oocytes included in the potential fecundity estimate may be lost through resorption from the ovary, a process known as atresia. Atresia seems mainly to be initiated under low nutritional status prior to spawning. The relationship between atresia and oocyte diameter is negatively related. As the oocyte diameter increases during the spawning season, occurrence of atresia decreases. Report Gadus morhua Institute for Marine Research: Brage IMR |
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Open Polar |
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Institute for Marine Research: Brage IMR |
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language |
English |
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cod torsk VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 |
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cod torsk VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 Hardardottir, Kristin Kjesbu, Olav Sigurd Marteinsdottir, Gudrun Relationship between atresia, fish size and condition in Icelandic cod (Gadus morhua L.) |
topic_facet |
cod torsk VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 |
description |
Cod is a determinate spawner, with a high potential fecundity. That is, a large definite number of oocytes start maturing prior to spawning. Environmental factors, such as water temperature and food availability have strong effects on nutritional status and fish size. Accumulation of energy prior to spawning is important, as food intake during spawning is minimum. Fecundity is a changeable process that can be adjusted to the condition of the fish. Under favorable circumstances potential fecundity may be equivalent to the number of eggs spawned during the spawning season. When the environmental conditions are unfavorable some or all, developing oocytes included in the potential fecundity estimate may be lost through resorption from the ovary, a process known as atresia. Atresia seems mainly to be initiated under low nutritional status prior to spawning. The relationship between atresia and oocyte diameter is negatively related. As the oocyte diameter increases during the spawning season, occurrence of atresia decreases. |
format |
Report |
author |
Hardardottir, Kristin Kjesbu, Olav Sigurd Marteinsdottir, Gudrun |
author_facet |
Hardardottir, Kristin Kjesbu, Olav Sigurd Marteinsdottir, Gudrun |
author_sort |
Hardardottir, Kristin |
title |
Relationship between atresia, fish size and condition in Icelandic cod (Gadus morhua L.) |
title_short |
Relationship between atresia, fish size and condition in Icelandic cod (Gadus morhua L.) |
title_full |
Relationship between atresia, fish size and condition in Icelandic cod (Gadus morhua L.) |
title_fullStr |
Relationship between atresia, fish size and condition in Icelandic cod (Gadus morhua L.) |
title_full_unstemmed |
Relationship between atresia, fish size and condition in Icelandic cod (Gadus morhua L.) |
title_sort |
relationship between atresia, fish size and condition in icelandic cod (gadus morhua l.) |
publisher |
ICES |
publishDate |
2001 |
url |
http://hdl.handle.net/11250/100479 |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
18 s. |
op_relation |
ICES CM documents 2001/J:19 http://hdl.handle.net/11250/100479 |
_version_ |
1766005447207157760 |