Masters Thesis

Variation, behavior and ecology of the prickly sculpin (Cottus asper Richardson): from the San Joaquin River, California.

Sculpins of the genus Cottus are commonly found in brackish water and streams of the Pacific drainage of North America (Morris, 1961). Though common, they are infrequently encountered being small, bottom dwelling fish, rarely exceeding 1 50 mm S. The prickly sculpin (Cottus asper Richardson) is found in both freshwater and the intertidal zone from Seward, Alaska., to the Ventura River in southern California. Inland in California, Casper is found in the Sacramento River below Shasta Lake and in the San Joaquin River drainage system; coastal populations are found in fresh and brackish water from the Ventura. River northward (Krejsa,

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