Polymorphic spawning-nest types in a local population of the fluvial sculpin, Cottus nozawae (Teleostei: Cottidae)

The nesting behavior of a fluvial sculpin Cottus nozawae population was investigated in a stream–reservoir system on the Sainai River, northern Honshu Island, Japan in 2003, 2004 and 2006. Except for the usual rock nest-spawning type (RSN), two new types of spawning nest were found: hole nest spawni...

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