transgenic farm animals would be particularly valuable and therefore would be kept in carefully controlled environments aquacultured fish by contrast are naturally mobile and breed easily with wild species the aebc report recommends that transgenic fish should not be raised in offshore pens owing to the high probability of escape the pew initiative study points out that the impact of escaped aquaculture fish scientists agree that the possible impacts on nontarget species should be monitored and compared with the effects of other current agricultural practices such as chemical pesticide use gm science review panel