Triploid and diploid rainbow trout do not differ in their stress response to transportation

Leggatt, Rosalind A., Scheer, Ken W., Afonso, Luis O. B. and Iwama, George K. 2006, Triploid and diploid rainbow trout do not differ in their stress response to transportation, North American journal of aquaculture, vol. 68, no. 1, pp. 1-8, doi: 10.1577/A05-035.1.

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Title Triploid and diploid rainbow trout do not differ in their stress response to transportation
Author(s) Leggatt, Rosalind A.
Scheer, Ken W.
Afonso, Luis O. B.ORCID iD for Afonso, Luis O. B.
Iwama, George K.
Journal name North American journal of aquaculture
Volume number 68
Issue number 1
Start page 1
End page 8
Total pages 8
Publisher American Fisheries Society
Place of publication Bethesda, Md.
Publication date 2006-01
ISSN 1522-2055
Keyword(s) oncorhynchus mykiss
Summary We examined the neuroendocrine and cellular stress responses of diploid and triploid rainbow trout Oncorhynchus mykiss to transportation. Juvenile diploid and triploid rainbow trout (28 and 26 g/fish average weight, respectively) were stocked at 100 g/L in replicate 70-L tanks and subjected to transportation for an 8-h period. Subsequent levels of plasma cortisol and glucose and of cellular hepatic glutathione (GSH) and heat shock protein 70 (Hsp70) were similar between ploidy groups, indicating that triploid fish respond to transportation in much the same way as diploid fish. A stationary treatment was also included that involved confinement of experimental fish in similar tanks without transport to determine to what extent high-density containment contributed to the stress response in the absence of the noise and vibration of transport. Unexpectedly, fish in the stationary treatment had significantly higher plasma cortisol and glucose levels than the transported fish; however, this might be attributable to a confounding effect of hyperoxia, as oxygen levels fluctuated between 150% and 460% saturation in the stationary tank, while those in the transported tank remained within 100–200% saturation. We suggest that when long stops are necessary while transporting fish, water agitators be used to preclude the additional stress of excessive gas saturation. This may be particularly important for triploid fish, which had lower hepatic GSH levels than diploid fish as well as a low level of mortality in the stationary treatment, unlike the diploid fish.
Language eng
DOI 10.1577/A05-035.1
Field of Research 070401 Aquaculture
Socio Economic Objective 830102 Aquaculture Fin Fish (excl. Tuna)
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2006, American Fisheries Society
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