期刊
JOURNAL OF FISH BIOLOGY
卷 100, 期 4, 页码 1088-1092出版社
WILEY
DOI: 10.1111/jfb.15007
关键词
behaviour; freshwater; movement; Salmonidae; salmonids; stream
资金
- JSPS KAKENHI grant [21H03647]
- Grants-in-Aid for Scientific Research [21H03647] Funding Source: KAKEN
This study investigated the diel migration pattern of pink salmon fry in three small streams and found that they mainly migrate within a few hours after sunset, possibly to avoid predation.
Downstream migration is a critical stage in the anadromous salmonid life cycle, but previous studies have shown different results between rivers or surveys for the diel downstream migration pattern of the fry of the pink salmon Oncorhynchus gorbuscha. We investigated the diel migration pattern of pink salmon fry in three small streams. Our results showed that pink salmon fry migrate mainly within a few hours after sunset; 89.9% of migration occurred between 18:00 and 23:00. Therefore, the results indicated that sunset time influences the diel migration pattern of pink salmon fry in small streams. This pattern could be a predator-avoidance behaviour.
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