The problem of predation

Once set free in a new environment, non-native piscivores, or animals that eat fish, can wreak havoc on native fish populations. In the Colorado River Basin, such Read More…

Fishy food chain

We’ve frequently observed that juvenile Chinook salmon are a popular menu item for a number of introduced predatory fish, such as striped bass and largemouth bass. However, Read More…

Arrested development

Pacific lampreys (Lampetra tridentata) are a species with a prolonged infancy. They begin their life cycle in freshwater as blind, worm-like larvae called ammocoetes, and remain in Read More…

Frogs, toads, and hungry trout

In the late 1800s, most high Sierra Nevada lakes were teeming with frogs and toads, but contained virtually no fish. Over the past century, however, the number Read More…

State of the science on fish predation

The role of predation in aquatic ecosystems can be a complex matter, and when it concerns Central Valley salmon and steelhead populations, a contentious one as well. Read More…

Gopher (rockfish) guts

We know the importance of studying what fish eat when it comes to the feeding habits of salmon predators (see What’s for dinner, Last meal, Survival of Read More…

Fat little trout

Our pudgy buddy here illustrates the benefits of being an opportunistic feeder. As wise fishermen know, trout often aggressively pursue whatever prey is readily available at the Read More…

Opportunistic meal

If you have been following our Field Notes posts, then you will recall from Last Meal that we are currently identifying the stomach contents of hundreds of Read More…

Northern pikeminnow bounty fishing

Predation is a natural part of maintaining a healthy ecosystem. But when predation by one species on another increases because of human changes to the environment, it Read More…