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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 .
A 2012 federal recovery plan reported that fewer than 500 adult Southern California steelhead return annually to natal waters located between southern San Luis Obispo County and the U.S.-Mexico ...
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 ...
That night, 271 Southern California steelhead trout were transported to a hatchery in Fillmore for safe keeping. With 530 of the rare fish counted in the creek in November, it represented a large ...
The federally endangered southern California steelhead (listed in 1997) is of particular importance, given the watershed's often dry and always variable climate. [4] The steelhead found in the Ventura River are part of the Southern California Steelhead Distinct Population Segment (DPS) were listed as federally endangered. [6]
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]
Southern California steelhead trout have been pushed to the brink of extinction as their river habitats have been altered by development and fragmented by barriers and dams.