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There are currently 15 DPS for steelhead (Oncorhynchus mykiss) and 31 evolutionarily significant units (ESU) for five species of Pacific salmon Oncorhynchus. The boundaries of these areas are used to determine whether specific populations of a species should be designated threatened or endangered species under the Endangered Species Act .
There are many threats to the survival of the Southern California Steelhead DPS. Principal threats include, but are not limited to, alteration of stream flow patterns and habitat degradation, barriers to fish passages, channel alterations, water quality problems, non-native exotic fish and plants and climate change. [5]
The creek hosts endangered species act listed threatened South-Central coastal distinct population segment (DPS) of anadromous steelhead trout (Oncorhynchus mykiss).Little Arthur Creek is one of the last remaining "inland" central coast steelhead streams with viable fish runs and is one of only a few Pajaro River tributaries with cool, perennial summer rearing habitat. [7]
In February, 1999, steelhead (Oncorhyncus mykiss irideus) were discovered in the creek by Toby Shackelford, making San Mateo Creek the only watercourse south of Malibu Creek in Los Angeles County with steelhead in the endangered Southern California Steelhead DPS. [19] Steelhead have historically spawned in the creek, whose upper reaches also ...
The steelhead found in the Ventura River are part of the Southern California Steelhead Distinct Population Segment (DPS) were listed as federally endangered. [6] Genetic analysis of the steelhead trout (Oncorhynchus mykiss) in the Ventura river watershed (both above and below Matilija Dam) has shown them to be of native and not hatchery stocks ...
Malibu Creek Steelhead (c.1943) It is estimated that Steelhead (Oncorhyncus mykiss irideus) populations within the Southern California Coast Steelhead Distinct population segment (DPS) have declined dramatically from annual runs totaling 32,000-46,000 adults to less than 500 returning adult fish. [10]
The Central California Coast Steelhead DPS is federally listed as threatened as a result of habitat loss and degradation, as well as the widespread installation of migration barriers. [8] Rainbow trout migrate from Upper San Leandro Reservoir to Buckhorn Creek to spawn during periods of high water. They have been observed in the lower and upper ...
The Klamath River is the third-largest salmon and steelhead producing river on the west coast of the contiguous United States. The river's watershed – the Klamath Basin – encompasses more than 15,000 square miles (39,000 km 2 ), and is known for its biodiverse forests, large areas of designated wilderness , and freshwater marshes that ...