California is stocking lakes by dumping non-native fish from planes without permits, an environmental group is claiming. Wilderness Watch says the California Department of Fish and Game is illegally jettisoning “fish by airplanes and canisters borne by packstock into waters of the United States, including those in federally designated areas”. It says the state does not have Clean Water Act permits to dump fish into lakes by air, or to release fish fry “transported in oxygenated plastic bags” by horses and mules. It alleges that stocked fish “alter the physical integrity of the lakes” by changing nutrient cycles, spreading diseases to amphibians, eating tadpoles and competing with native fish for food. The case (details here) will be heard in a San Francisco court.