Upper thermal tolerance of wild-type, domesticated and growth hormone-transgenic coho salmon Oncorhynchus kisutch

2015 ◽  
Vol 87 (3) ◽  
pp. 763-773 ◽  
Author(s):  
Z. Chen ◽  
R. H. Devlin ◽  
A. P. Farrell
Keyword(s):  
Growth Hormone ◽  
Thermal Tolerance ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Wild Type ◽  
Upper Thermal Tolerance

Salinity acclimation and advanced parr–smolt transformation in growth-hormone transgenic coho salmon (Oncorhynchus kisutch)

2017 ◽  
Vol 95 (9) ◽  
pp. 633-643 ◽  
Author(s):  
J.S. Bystriansky ◽  
W.C. Clarke ◽  
M.M. Alonge ◽  
S.M. Judd ◽  
P.M. Schulte ◽  
...  
Keyword(s):  
Growth Hormone ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Transgenic Fish ◽  
Salmonid Fishes ◽  
Wild Type ◽  
Salinity Acclimation ◽  
Seawater Tolerance ◽  
Group A ◽  
Seawater Acclimation

Growth hormone (GH) is involved in the parr–smolt transformation of salmonid fishes and is known to improve salinity tolerance. This study compared the capacity for seawater acclimation of GH transgenic coho salmon (Oncorhynchus kisutch (Walbaum, 1792)) to that of wild-type fish, allowing examination of responses to sustained (chronic) exposure to elevated GH. GH transgenic fish (GH TG) smolted 1 year in advance of wild-type salmon and showed a greater capacity to hypo-osmoregulate in seawater. As GH TG fish were much larger than the wild-type fish, a second experiment was conducted with three size-matched groups of coho salmon (a 1+-year-old wild-type group, a 1+-year-old ration-restricted GH TG group, and a 0+-year-old fully fed GH TG group). When size-matched, the effect of GH transgenesis was not as dramatic, but the feed-rationed TG1+ group exhibited smaller deviations in plasma ion and osmolality levels following seawater exposure than did the other groups, suggesting a somewhat improved hypo-osmoregulatory ability. These results support a role for GH in the development of seawater tolerance by salmonid fishes independent of fish size.

scholarly journals Growth hormone transgenesis disrupts immune function in muscle of coho salmon (Oncorhynchus kisutch) impacting cross-talk with growth systems

2017 ◽  
Author(s):  
Abdullah Alzaid ◽  
Jin-Hyoung Kim ◽  
Robert H. Devlin ◽  
Samuel A.M. Martin ◽  
Daniel J. Macqueen
Keyword(s):  
Growth Hormone ◽  
Immune Function ◽  
Cross Talk ◽  
Coho Salmon ◽  
Mrna Level ◽  
Muscle Growth ◽  
Oncorhynchus Kisutch ◽  
Marker Genes ◽  
Wild Type ◽  
Igf System

ABSTRACTThe suppression of growth during infection should facilitate resource allocation towards effective immune function. Work supporting this hypothesis has been recently reported in teleosts, demonstrating immune-responsive regulation of the insulin-like growth factor (IGF) system - a key endocrine growth pathway that acts downstream of growth hormone (GH). Skeletal muscle is the main target for growth and energetic storage in fish, yet little is known about how growth is regulated in this tissue during an immune response. We addressed this knowledge gap by characterizing muscle immune responses in size-matched coho salmon (Oncorhynchus kisutch) achieving different growth rates. We compared a wild-type strain with two GH transgenic groups achieving either maximal or highly-suppressed growth – an experimental design that separates GH’s direct effects from its influence on growth rate. Fish were sampled 30h post-injection with PBS (control) or mimics of bacterial (peptidoglycan) or viral (Poly:IC) infection. We quantified the mRNA level expression of genes from the GH, GH receptor (GHR), IGF hormone, IGF1 receptor (IGF-1R) and IGF binding protein (IGFBP) families, along with marker genes for muscle growth and host defence genes involved in inflammatory or antiviral responses. We provide strong evidence for dampened immunity in the GH transgenics compared to wild-type animals. Strikingly, the muscle of GH transgenics achieving rapid growth showed no detectable antiviral response, coupled with evidence of a constitutive inflammatory state. GH and IGF system gene expression was also strongly altered by GH transgenesis and fast growth, both for baseline expression levels and responses to immune stimulation. Overall, our findings demonstrate that GH transgenesis disrupts normal immune function and growth-immune cross-talk in muscle, with implications for the health and welfare of farmed salmon.

scholarly journals Rearing in Seawater Mesocosms Improves the Spawning Performance of Growth Hormone Transgenic and Wild-Type Coho Salmon

PLoS ONE ◽  
2014 ◽  
Vol 9 (8) ◽  
pp. e105377 ◽  
Author(s):  
Rosalind A. Leggatt ◽  
Tanya Hollo ◽  
Wendy E. Vandersteen ◽  
Kassandra McFarlane ◽  
Benjamin Goh ◽  
...  
Keyword(s):  
Growth Hormone ◽  
Coho Salmon ◽  
Wild Type

Influence of Bovine Growth Hormone and L-Thyroxine on Growth, Muscle Composition, and Histological Structure of the Gonads, Thyroid, Pancreas, and Pituitary of Coho Salmon (Oncorhynchus kisutch)

1976 ◽  
Vol 33 (7) ◽  
pp. 1585-1603 ◽  
Author(s):  
David A. Higgs ◽  
Edward M. Donaldson ◽  
Helen M. Dye ◽  
J. R. McBride
Keyword(s):  
Growth Hormone ◽  
Phase I ◽  
Phase Ii ◽  
Growth Rates ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Control Fish ◽  
Histological Structure ◽  
Bovine Growth Hormone ◽  
Poor Growth

Groups of underyearling coho salmon (Oncorhynchus kisutch) were acclimated to 10 C well water and a photoperiod of 12 h L:12 h D. Excess ration (Oregon Moist Pellet) was presented daily. Doses of bovine growth hormone (5, 10, 20, 30, or 90 μg bGH/g body wt) and L-thyroxine (0.5, 5, or 30 μg T4/g) were administered over a period of 84 days (phase I) either by injection (via dorsal musculature or peritoneal cavity) or by hormone cholesterol implants into the muscle. Administration frequency of bGH and T4 was such (range 2 times/wk-1 time/3 wk) that fish theoretically received either 10 or 30 μg bGH/g per wk or 1 or 10 μg T4/g per wk. Control fish received either alkaline saline (pH 9.5) or a cholesterol pellet. After cessation of treatment the fish were observed for an additional 84 days (phase II). During phase I, growth rates (weight) for bGH fish (2.0–2.4% per day) and for T4 fish (0.97–1.1% per day) were significantly higher than those of control fish (0.42–0.59% per day). Among bGH fish, dorsal musculature injection (2 times/wk) was significantly more effective than intraperitoneal injection (1 time/2 wk).Increases in weight above control for bGH fish at 84 days ranged from 220 to 369%. Those for T4 fish extended from 47 to 78%. In phase II, control fish growth rates were higher (0.61–0.67% per day) than those for bGH fish (0.47–0.57% per day) and T4 fish (0.32–0.44% per day). Administration of bGH and T4 (high dose) caused a progressive decline in condition factor of fish from the control range. This trend was stopped and reversed in phase II.At 84 days, generally no significant differences were detected among groups for percentages of muscle water. However, some groups had significantly higher (bGH) and others lower (T4) percentages of muscle protein relative to those of control fish. Also, significant increases (T4) and decreases (bGH) in muscle lipid percentages were found. Hormone treatment altered the histological structure of the ovary, thyroid, exocrine (T4) and endocrine (bGH) pancreas, and somatotrop cells (T4) of the pituitary. A poor growth response was noted for two groups of coho administered bGH after acclimation to sea water.

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