Some fish can make electricity. They surround themselves with an electrical field. If anything moves in the field, the fish can feel it. Their electrical fields are able to detect food and their enemies.
Freshwater fisheries may disappear
Freshwater fisheries may disappear A researcher at the University of Alberta predicts
that factors such as climate warming, pollution and overfishing
could destroy Canada's freshwater fisheries within 50 years unless
measures are taken. Speaking at a conference on freshwater issues,
David Schindler said that increasing temperatures will cause
wetlands to disappear, disrupt fish migrations and promote the
invasion of non- native species to Canada's waterways. 17 MAY 2000
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