Signaling

Fish use body posture and movement to send signals to each other. Some of these postures exaggerate secondary sexual characteristics such as jaw size and body height in the case of salmon males. Males signal to females to stimulate them to spawn. Males and females use signals to assert dominance.

Pink Salmon (Oncorhynchus gorbuscha)
Pink Salmon (Oncorhynchus gorbuscha). Aspect ratio = 4:5.
Actinopterygii Alaska Alaska wild salmon Animal Biology Chordata Class Actinopterygii Cordova Ecology Hartney Bay Hartney Creek Humpback Salmon Infraclass Teleostei Neopterygii Oncorhynchus gorbuscha Pacific salmon Phylum Chordata Pink Salmon Prince William Sound Salmonidae Salmoniformes Salmoninae Seacam underwater housing South Central Alaska Subclass Neopterygii Summer Teleost Teleostei United States Vertebrate anadromous anadromy biological biosphere chordate diadromous diadromy fresh water freshwater in situ living lotic migratory naturalworld nature near Cordova organism semelparity semelparous stream under fresh water underwater underwaterphoto wild wild salmon
Sockeye Salmon male gaping threat display
Gaping, a threat display by a male Sockeye Salmon (Oncorhynchus nerka). Aspect Ratio = 1:2.5.
Actinopterygii Alaska Alaska wild salmon Animal Biology Chordata Class Actinopterygii Ecology Infraclass Teleostei Neopterygii Oncorhynchus nerka Pacific salmon Phylum Chordata Red Salmon Salmonidae Salmoniformes Salmoninae Seacam underwater housing Sockeye Salmon South Central Alaska Subclass Neopterygii Summer Teleost Teleostei United States Vertebrate aggression anadromous anadromy biological biosphere chordate diadromous diadromy fresh water freshwater gaping in situ living lotic migratory naturalworld nature organism portfolio salmonography.com semelparity semelparous stream under fresh water underwater underwaterphoto wild wild salmon

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