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The Systematics of the Prickly Sculpin, Cottus asper Richardson, a Polytypic Species Part II. Studies on the Life History, with Especial Reference to Migration

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Title: The Systematics of the Prickly Sculpin, Cottus asper Richardson, a Polytypic Species Part II. Studies on the Life History, with Especial Reference to Migration
Authors: Krejsa, Richard J.
Issue Date: Jul 1967
Publisher: University of Hawai'i Press
Citation: Krejsa RJ. 1967. The systematics of the prickly sculpin, Cottus asper Richardson, a polytypic species: part II. Studies on the life history, with especial reference to migration. Pac Sci 21(3): 414-422.
Abstract: The occurrence of a downstream spring migration of weakly-prickled
Cottus asper in coastal streams is confirmed and documented. Successful intertidal
spawning and incubation is followed by a pelagic larval stage of about one month.
Metamorphosis occurs and the prejuveniles settle to the bottom to feed in the
estuarine portion of the river. An upstream migration of adults precedes that of
the young-of-the-year in late summer . During the non-migratory phase, prickly
sculpins are located in the low gradient, low velocity portions of coastal streams.
Densely-prickled Cottus asper living in distant inland waters , where access to the
sea is almost impossible, undertake only local migratory movements. Densely prickled
forms living in some inland lakes and streams relatively close to the sea,
where access to the sea is open and relatively easy, do not migrate seaward but
undertake only local movements to spawn in fresh water. The present study discusses
differences in migratory behavior between "coastal" and "inland" prickly
sculpins
URI/DOI: http://hdl.handle.net/10125/7413
ISSN: 0030-8870
Appears in Collections:Pacific Science Volume 21, Number 3, 1967



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