Diel migration pattern of pink salmon fry in small streams

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 pi...

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Bibliographic Details
Published in:Journal of Fish Biology
Main Authors: Yamada, Taihei, Urabe, Hirokazu, Nakamura, Futoshi
Format: Article in Journal/Newspaper
Language:English
Published: John Wiley & Sons
Subjects:
behaviour
freshwater
movement
Salmonidae
salmonids
stream
460
Oncorhynchus gorbuscha
Pink salmon
Online Access:http://hdl.handle.net/2115/88720
https://doi.org/10.1111/jfb.15007
Description
Summary: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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