Re 40 years of swimming upstream to save fish (Viewpoints, Dec. 29): Peter Moyle has been one of the stalwart researchers of our California freshwater fish species for many decades, helping protect endangered fish species and researching the declines of many species. I'm happy to see he is still active. He could have added that the California Department of Water Resources continues to be a major impediment to protecting endangered river and stream habitats. The new proposal by Gov. Jerry Brown for Delta tunnels to convey more water south will certainly exacerbate the dangers for already endangered Delta fish. We need to find more ways to preserve freshwater habitats because about two-thirds of the states endangered species depend on such habitats. Extinction is forever.
-- Mark J Palmer, Davis, director, Wildlife Alive