User:CtopherL/Southern California Steelhead DPS
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Overview
Southern Steelhead have been observed as early as the late 19th century with many accounts recalling large schools of young salmon travelling up the mouths of the California rivers and streams.[1] Sightings of this fish began to dwindle as the popularity of the fishery increased along with a volume of residents moving into Southern California seeking to develop the landscapes. Oncorhyncus mykiss runs would begin in the winter as California's wet season would bring strong storms pushing mud and varying sediments downstream to estuaries. As the water level of the freshwater systems rose, this mud would meet and mix in the ocean giving the cue for the trout to begin their journey upstream to their spawning grounds.[1] As residency of Southern California increased, the landscape would have to be altered in order to accommodate for the homes that would have to be built and prevent damages. This included the construction of many concrete dams, gutters, ditches and systems of storm channels that would block and confuse O. mykiss as runoff was redirected. In addition, pumping of groundwater reduced the stream levels giving these fish a smaller window for estuaries to meet the ocean as well as a lesser chance to reach their natal waters upstream.[1]
References
"Net Loss: A History of the Vanishing Steelhead Trout in Southern California". PBS SoCal. 2011-02-16. Retrieved 2024-04-18.[1]
- ^ a b c d Bell, Ethan; Dagit, Rosi; Ligon, Frank (2011-04). "Colonization and Persistence of a Southern California Steelhead (Oncorhynchus mykiss) Population". Bulletin, Southern California Academy of Sciences. 110 (1): 1–16. doi:10.3160/0038-3872-110.1.1. ISSN 0038-3872.
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- ^ Dagit, Rosi (January 2020). "Occurences of Steelhead Trout(Oncorhynchus mykiss) in Southern California, 1994-2018". California Fish and Wildlife.