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ADULT TRIPLOIDS IN A RAINBOW TROUT FAMILY
Gary H. Thorgaard 1 and Graham A. E. Gall 1
1 Department of Animal Science, University of California, Davis, California 95616
Six triploid individuals were found in a full-sib family of 11 adult rainbow trout (Salmo gairdneri) from a domesticated hatchery stock. The triploid individuals were normal in size and external appearance, had underdeveloped gonads, and showed no evidence of 3n/2n chimerism or mosaicism. XXY triploids were males, suggesting that the Y chromosome is male determining in trout. Because they may avoid production losses associated with sexual maturation in normal fish, triploid trout and salmon could potentially be useful in fish culture.
Submitted on April 23, 1979Revised on August 8, 1979
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