The Potential Ecological and Genetic Impacts of Aquaculture Biotechnologies: Eco‐Evolutionary Considerations for Managing the Blue Revolution

Moreau, Darek T. R.; Fleming, Ian A.

doi:10.1002/9780470963159.ch21

Cited by 1 publication

(2 citation statements)

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“…In this study, the decreased growth of transgenic relative to wild-type juveniles was probably owing to their higher metabolic demands [44] in combination with limited food availability and warm water temperatures (mean 16.9 + 2.58C during the experiment). Regardless of the mechanism, our observations of reduced growth of transgenic salmon in stream mesocosms but increased growth in hatchery-like conditions contribute to evidence suggesting a complex, dynamic interplay between transgenic growth potential and the environment [25,26].…”

Section: Discussionmentioning

confidence: 64%

“…The gene construct used was a chimeric GH construct (opAFP-GHc2; EO-1a line) that has been shown to greatly enhance growth [21], reduce reproductive performance among precocious mature males [22] and increase risk-taking foraging behaviours [23,24] in transgenic individuals. However, such phenotypic changes are known to be heavily influenced by gene-environment interactions [25,26]. The wild populations used in our experimental crosses were numerically large with no indications of inbreeding depression or low heterozygosity, and unaffected by the potentially confounding influences of domestication selection for growth [27].…”

Section: Materials and Methods (A) Experimental Fishesmentioning

confidence: 99%

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Hybridization between genetically modified Atlantic salmon and wild brown trout reveals novel ecological interactions

et al. 2013

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Interspecific hybridization is a route for transgenes from genetically modified (GM) animals to invade wild populations, yet the ecological effects and potential risks that may emerge from such hybridization are unknown. Through experimental crosses, we demonstrate transmission of a growth hormone transgene via hybridization between a candidate for commercial aquaculture production, GM Atlantic salmon (Salmo salar) and closely related wild brown trout (Salmo trutta). Transgenic hybrids were viable and grew more rapidly than transgenic salmon and other non-transgenic crosses in hatchery-like conditions. In stream mesocosms designed to more closely emulate natural conditions, transgenic hybrids appeared to express competitive dominance and suppressed the growth of transgenic and non-transgenic (wildtype) salmon by 82 and 54 per cent, respectively. To the best of our knowledge, this is the first demonstration of environmental impacts of hybridization between a GM animal and a closely related species. These results provide empirical evidence of the first steps towards introgression of foreign transgenes into the genomes of new species and contribute to the growing evidence that transgenic animals have complex and context-specific interactions with wild populations. We suggest that interspecific hybridization be explicitly considered when assessing the environmental consequences should transgenic animals escape to nature.

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Section: Discussionmentioning

confidence: 64%