| Autor: |
Ellis, D. V., Giles, M. A. |
| Zdroj: |
Transactions of the American Fisheries Society; October 1965, Vol. 94 Issue: 4 p358-362, 5p |
| Abstrakt: |
Spawning of the walleye, based on clear sightings of simultaneously released eggs and milt, consisted of a series of violent synchronized acts by promiscuous groups of fish. Each act was preceded by a short courtship consisting of approaches and bodily contact between individuals, followed by an upward rush of grouped spawners. There was a diel behavioral cycle shown by walleyes on natural spawning grounds, in experimental tanks and in a stream compound. The cycle consisted of low activity in daytime, expressed mainly by position-holding, and increase of activity in the evening expressed in courtship behavior. Under experimental conditions courtship led either to spawning or gradually diminished without consummation. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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