May 15, 2013 — University of British Columbia scientist William Cheung has documented a gradual shifting of some fish species further north than their typical ranges. Some tropical commercial species are being found by fishing boats in waters near New England. Ocean water in the tropics is becoming too warm due to climate change, so they are seeking cooler places.
If tropical waters continue to increase in temperature, habitat for local fish will shrink and they may not be able to inhabit their customary ranges. If more tropical commercial fish move away, local economies could be damaged because there will be reduced catches. (In addition, damage from rising seas will undoubtedly have some negative impacts in coastal areas and island communities.)
Northern areas actually may benefit somewhat, at least in terms of an influx of fish, but what will happen to their native fish populations? If ocean water is increasing in temperature by almost two degrees per decade, many fish species may be unable to live in their normal habitats.
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