Reproduction of Cottus asper
Document source:
Main Ref. Scott, W.B. and E.J. Crossman, 1973
Mode dioecism
Fertilization external
Mating type polygyny
Spawning frequency
Spawning aggregation Ref.  
Batch spawner Ref.  
Reproductive guild guarders
Parental Care paternal
Description of life cycle and mating behavior Prior to breeding, males move downstream and select a nesting site under boulders or flat rocks. Females aggregate some distance upstream and move down singly to the spawning area. Courtship behavior occurs outside the nest until a female is selected. The pair enter the nesting site, courting continues until eggs are deposited and fertilized. The female then leaves the nest and goes back upstream to feed, while the male spawns with other females or fans and guards the eggs. The male does not feed until the eggs have hatched, moving upstream only in the late summer (Ref. 1998, 27547). During the planktonic stage, larvae of the freshwater nonanadromous form in lakes show distinct diurnal vertical migrations, being most abundant at the surface during the darkest hours of the night. They apparently stay deep in the water during the day and on bright moonlight nights (Ref. 28920). Metamorphosis is complete by the end of the planktonic period and the young take up a demersal mode of life. The young coastal form may move upstream during the fall, although the young may remain in the estuary for a full year (Ref. 27547).
Search for more references on reproduction Scirus
(e.g. 9948)
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