Photo Friday: Flashy Fish Tails

Fluorescent fish tails are all the fashion for Chinook salmon this season. This batch of salmon parr are freshly marked with a temporary fluorescent dye and ready Read More…

Tagging Training

With a new mark-recapture project getting underway in the San Joaquin River, we recently held a training at our Oakdale office to make sure all of our Read More…

Film Friday: Marking Salmon

https://www.youtube.com/watch?v=rlOLpBA0UU8 Juvenile salmon outmigration season is underway! As the young fish make their way through the rivers and out towards the ocean, we monitor their population with Read More…

Temporary tattoo

Marking fish with dye to test the efficiency of our rotary screw traps is like giving fish a temporary tattoo. The bright, injectable photonic dyes (IPDs) that Read More…

Makeshift lab

Sometimes, conducting research in challenging environments like the Mekong calls for improvising with the resources at hand. In this case, we performed a fish marking training on Read More…

Spray on tan

Sporting a fresh coat of tan, these juvenile Chinook salmon look like they are ready for summer. Actually, these fish were just removed from a color bath Read More…

Efficiency at its best

Rotary screw traps only catch a small proportion of the salmon migrating past the traps, so in order to estimate the total fish production on a given 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…

Splat!

Fish biologists mark fish with a variety of techniques, but always with the same goal of being able to identify previously captured fish, usually for the purpose Read More…

Surgically Implanting PIT Tags

The recent winter storms have increased salmon and steelhead movement throughout the Central Valley,┬áresulting┬áin increased catches of downstream migrating fish in rotary screw-traps. A few captured rainbow Read More…