Drum fish are given their unique name not because they have drums in their bodies but because they let out croaker sounds ...

Parasites in California freshwater fish can cause gastrointestinal problems, weight loss and lethargy. News. ... H. pumilio is found at the base of the fins and C. formosanus is found on the gills.

The larvae of freshwater mussels on the gills of a small fish. Courtesy of Chris Barnhart. Remarkably, some mussels depend on a specific host fish, and they’ll tailor their lures to them.

Fish absorb water through gills through the process of osmosis, ... Unlike saltwater fish, freshwater fish do not need to consume water through their mouth to survive.

Freshwater fish take up chemicals from the surrounding water through their gills Biologists have cast doubt on the long-held theory that fish gills evolved primarily for the purpose of breathing. The ...

Freshwater gill net surveys are generally performed every four years but may be more frequent on high-profile lakes. Gill nets are about 125 feet long and 8 feet deep.