Or maybe they're carp? Each fish was about 1 ft long, in shallow water, Moraga Creek, maybe 1 mile before it mets San Leandro Reservoir. Maybe they were spawning.
Pesca de capas en Las Fuentes de Cadereyta.
Invasive carp - see article from last year: http://www.kionrightnow.com/news/local-news/neary-lagoon-looks-like-a-graveyard-for-carp/25714190
Introduced by Dongjiang raw water, the drinking water which the Hong Kong Government buy from Mainland China.
Captive specimen kept at the Aguda Littoral Station, a fisheries museum, aquarium and marine research centre in northern Portugal. Locally caught in the Douro basin for educational purposes.
錦鯉 Koi (Cyprinus carpio ssp. haematopterus)
A freshwater fish that is part of the Cyprinidae family. They tend to live in freshwater bodies and streams and some creeks. Red shiners can live up to three years. They are omnivorous, meaning they eat both aquatic and terrestrial invertebrates. They can grow up to 3 inches in length and tend to live away from bodies of water that are too acidic.
The Cypriniformes are an order of ray-finned fish, including the carps, minnows, loaches and relatives. This order contains five to six families, over 320 genera, and more than 3,250 species, with new species being described every few months or so, and new genera being recognized frequently. They are most diverse in southeastern Asia, but are entirely absent from Australia and South America.