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Notes on the Introduction of Salmo Nelsoni Evermann into California from Mexico
Author(s) -
Needham Paul R.
Publication year - 1938
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1937)67[139:notios]2.0.co;2
Subject(s) - salmo , fishery , brood , broodstock , trout , habitat , biology , geography , rainbow trout , ecology , fish <actinopterygii> , aquaculture
Through the courtesy of the Mexican Government, fifty yearling Salmo nelsoni were introduced into California from the Santo Domingo River in Lower California, Mexico, in May, 1937. The chief reasons for the selection of this species of trout for experimental brood stock purposes are (1) the need of developing a non‐migratory type of trout for planting, (2) the advisability of starting with a brood stock selected from a pure, wild strain which has been prevented by barriers from migrating to the sea over a long period of years, and (3) the high temperature tolerance shown by this trout in its natural habitat. A brief history of the species is given. A distinct hump on the back, directly above the preopercle at the base of the head, hitherto not described, is suggested as a character by which S. nelsoni may be distinguished from other members of the rainbow series found in the coastal waters of California.