Fish Physiology and Biochemistry

, Volume 6, Issue 2, pp 113–120 | Cite as

The growth and reproductive endocrinology of adult triploid Pacific salmonids

  • Tillmann J. Benfey
  • Helen M. Dye
  • Igor I. Solar
  • Edward M. Donaldson


This paper describes the effect of triploidy on growth and reproductive endocrinology in the months leading up to and including spawning in rainbow trout,Salmo gairdneri, and pink salmon,Oncorhynchus gorbuscha. Growth rates were the same for diploid and triploid rainbow trout, but triploid female pink salmon were smaller than maturing diploid females and diploid and triploid males of the same age. Triploid males of both species developed typical secondary sexual characteristics and had normal endocrine profiles, although their cycle appeared to be delayed by about one month. Triploid females remained silvery in appearance and showed no endocrine signs of maturation, even at the level of the pituitary. Thus, although triploids of both sexes are genetically sterile, only the females do not undergo physiological maturation.


growth endocrinology reproduction triploid salmonid sterilization aquaculture 


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Copyright information

© Kugler Publication 1989

Authors and Affiliations

  • Tillmann J. Benfey
    • 1
  • Helen M. Dye
    • 1
  • Igor I. Solar
    • 1
  • Edward M. Donaldson
    • 1
  1. 1.Department of Fisheries and Oceans, Biological Sciences BranchWest Vancouver LaboratoryWest VancouverCanada

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