SOME genetically modified fish are like ferocious tigers in a bare tank but appear to be pussy cats under more natural conditions. This finding suggests it will not be easy for biologists to predict the ecological consequences of escaped transgenic animals.
Salmon genetically engineered to overproduce growth hormone can put on up to 25 times the weight of wild salmon and could provide aquaculturists with a faster way to raise fish to market size. However, lab tests showed that these transgenic fish are more aggressive predators than wild salmon, raising concerns that they could harm wild ecosystems if they escape.…
