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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]
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 .
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]
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 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 ...
Three adult steelhead were sighted five years ago in the Santa Clara River that flows between Santa Clarita and Oxnard, Marlow adds. Only 177 Southern California steelhead have been seen in the ...
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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 ...