Global warming also warms the earth’s waters and many fish along with their environments are sensitive to dramatic temperature changes. Coral reef’s have become bleached and died due to global warming and thousands of fish species rely on coral reefs for survival. Also the simple increase in temperature can be harmful to a fishes body if too high or low.
Perhaps the largest threat is from the destruction of natural ecosystem formations like coral reefs. This is happening two main ways; first, ocean acidification is, as bburg pointed out, killing the coral that make up the reefs. If the coral die, the whole ecosystem and all the fish and other marine animals that depend on it will die as well. Secondly, increased storms and current changes are threatening to destroy many coral reefs and natural ecosystems for many fish species.
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