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Predators Decimate Young Salmon
Water managers have been saying for years that California’s salmon population is under attack by non-native predatory fish. Now there is science to prove it.

Striped bass and largemouth bass, as well as channel catfish and white catfish, were identified as the predators doing the most damage to young salmon. It is estimated the current bass population needs about 27,500 tons of food in a year to sustain itself. Of that, about 264 tons is salmon.

That means this predator has the capability of decimating the entire salmon population in any given year.

Bass were introduced to the Delta from the East Coast 130 years ago to populate a new western commercial fishery. These non-native fish, as well as critical habitat loss, Asian clams that compete for food, and water hyacinth all contribute to poor conditions for native fish like salmon.


 
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Common Aquatic Bacteria Responsible for Fish Kill - Test results from fish sampling suggest the recent Spofford Lake fish kill resulted from the presence of a common aquatic bacteria combined with a time of year when fish were stressed from spawning activity and war water temperatures. Test results showed that no virus was present in the fish tested and that the bacteria found was Aeromonas Hydrophila. According to Fish Health Center Staff, this bacteria only becomes lethal to fish when there is another stressor to the fish. In some cases, the bacteria can infect a single fish and then multiply rapidly, causing a substantial fish kill.


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