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首页> 外文期刊>Transactions of the American Fisheries Society >Competitive ability and mortality of growth-enhanced transgenic coho salmon fry and parr when foraging for food.
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Competitive ability and mortality of growth-enhanced transgenic coho salmon fry and parr when foraging for food.

机译：觅食时生长增强的转基因银大麻哈鱼鱼苗和幼鱼的竞争能力和死亡率。

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摘要

Coho salmon Oncorhynchus kisutch were genetically altered to produce growth hormone without regulation, causing them grow 11 times larger (on average) than control fish after 14 months. This technology has potential benefits for the aquaculture industry, but the environmental risk associated with the escape of transgenic fish into the wild is not known. To partially address this issue, we experimentally investigated how well transgenic salmon survive when given a choice to consume food in a predator's presence. If transgenic salmon are to retain their growth advantage, we predict that they must also be more effective at competing for food than wild salmon and be willing to suffer higher mortality rates when foraging. The relative competitive abilities of transgenic and control salmon at two different ages were tested with an unequal competitors ideal free distribution. A larger proportion of transgenic salmon fed within the system, although they were not overrepresented at a higher-quantity food source. When feeding in the presence of a predator, there was no measurable difference in mortality rates between transgenic and control salmon at both the fry and parr stages. These data indicate that, under the limited environmental conditions we tested transgenic coho salmon are at least competitively equal to control fish and do not suffer higher rates of mortality to acquire food resources and maintain their enhanced growth.
机译：对银大麻哈鱼Oncorhynchus kisutch进行了基因改造，以产生不受调节的生长激素，导致它们在14个月后生长（平均）比对照鱼大11倍。这项技术对水产养殖业具有潜在的好处，但是与转基因鱼类逃逸到野外相关的环境风险尚不清楚。为了部分解决这个问题，我们通过实验研究了当选择在捕食者面前食用食物时，转基因鲑鱼如何生存。如果转基因鲑鱼要保持其生长优势，我们预测它们还必须比野生鲑鱼更有效地争夺食物，并且愿意在觅食时遭受更高的死亡率。用不平等的竞争者理想的自由分布测试了两个不同年龄的转基因鲑鱼和对照鲑鱼的相对竞争能力。尽管在较高数量的食物来源中并没有过分代表，但系统中饲喂的转基因鲑鱼比例较高。在有捕食者的情况下进食时，在苗期和幼鱼期，转基因鲑和对照鲑的死亡率没有可测量的差异。这些数据表明，在有限的环境条件下，我们测试的转基因银大麻哈鱼至少在竞争上等同于对照鱼，并且在获取粮食资源和维持其增长方面没有更高的死亡率。

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