Reproduction of Oncorhynchus nerka
Document source: http://fishbase.mnhn.fr/Reproduction/FishReproSummary.php?ID=243&GenusName=Oncorhynchus&SpeciesName=nerka&fc=76&StockCode=257
 
Main Ref. Morrow, J.E., 1980
Mode dioecism
Fertilization external
Mating type polyandry
Spawning frequency once in a lifetime
Spawning aggregation Ref.  
Batch spawner Ref.  Morrow, J.E., 1980
Reproductive guild guarders
nesters
Parental Care maternal
Description of life cycle and mating behavior Adult sockeyes return to natal streams to spawn. This occurs during summer and fall and as late as December in the southern part of the range. The female selects a site, usually with gravel bottom, and digs a nest. During nest building, the female is attended by a dominant male and a few subordinate males. At this stage, females tend to be aggressive toward other females and subordinate males; males are aggressive toward other males. Between digging acts, the female will rest over the pit while the dominant male courts her. Once the nest is completed, the female enters the nest, followed immediately by the dominant male who comes close beside her. Their mouths gape, and the pair vibrates to release eggs and sperm. One or more subordinate males may come to the other side of the female and join in the spawning. The female then moves to the upstream edge of the nest and digs again, covering the old nest, at the same time creating a new one just upstream from the previous one. A female normally needs 3 to 5 days to deposit all her eggs and utilizes 3 to 5 nests for this purpose. She may spawn with several dominant males. A male may breed with several females. All adult sockeye die after spawning (Ref. 27547). Reproductive strategy: synchronous ovarian organization, determinate fecundity (Ref. 51846).
Search for more references on reproduction Scirus
(e.g. 9948)
( e.g. cephalopods )
Entered by Garilao, Cristina V. on 01.23.96
Modified by Luna, Susan M. on 07.25.17
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