Oncorhynchus mykiss

Small fry

It is difficult to imagine that steelhead (Oncorhynchus mykiss) begin life in such a delicate state. The early life-stage of most fish species, like many other animals, Read More…

Caudal fin pink

This rainbow trout (Oncorhynchus mykiss) is donning a pink mark on its caudal fin not because it is the "in" color for spring fashion aficionados, but because Read More…

Winter trout spawning

We captured this "ripe" female rainbow trout (Oncorhynchus mykiss) while electrofishing in a California reservoir. You can tell if a female is ready to spawn by how Read More…

Catch and release, again

As explained in our recent post Fisheries Outpatient Center, we are currently conducting a study of trout (Oncorhynchus mykiss) movements in a central valley watershed. We expected Read More…

Rosy cheeks

This fish exhibits conspicuous rosy cheeks characteristic of adult rainbow trout (Oncorhynchus mykiss); but color like beauty, is in the eye of the beholder. Rainbow trout have Read More…

Fisheries outpatient center

Surgically implanting acoustic transmitters into fish requires considerable equipment, planning, and preparation. The task is difficult to accomplish in a laboratory environment, and even more complicated in Read More…

Measure me

After species identification, length is the first and most important biological factor evaluated, and for steelhead trout (Oncorhynchus mykiss) typically recorded as fork and total length (65 Read More…

Young-of-year rainbow trout

This juvenile rainbow trout (Oncorhynchus mykiss) was recently captured in a Central Valley tributary. At 3 inches, it is similar in size to many young trout typically Read More…

Rainbow trout or steelhead?

This may seem like a simple question, but there is more than meets the eye. At first glance the fish in the photo above appears to be Read More…