|Taking one step back
from what impacts introductions have, what about the hatchery itself? Hatchery effluents can have a big impacts
on water quality. Depletion of water supplies would also impact the native
fauna. Many trout hatcheries use a
tremendous amount of water for their flow through systems. Hatcheries tend to
attract thousands of birds and mammals. In a recent 4 year period, over
50,000 birds alone were legally killed at aquaculture operations of which
20,000 were herons and egrets. I can
only imagine how many others came to an untimely end and were not reported.
And there is chemical pollution with herbicides and antibiotics.