Warming ocean temperatures off the North Atlantic are causing fish to move up the coast to cooler waters — raising concerns among scientists and regulators about the ocean’s ecosystem, and potentially changing the experience Delaware anglers have enjoyed for generations.
Many fish species, especially their young and larvae, have highly specific temperature and salinity ranges and must move to cooler waters to survive. That’s why summer flounder are less abundant along the Delmarva Peninsula and are more common farther north.
http://theterramarproject.org/thedailycatch/climate-change-forcing-fish-migration/
Canadian scientists have devised a new scale for measuring ocean change – the fish. They have used the changing make-up of the global fisheries catch to detect the signature of global warming.
In a warming world, fish that find the sea temperatures too hot for comfort could move north or south, away from the tropics, or to deeper and therefore cooler waters.
Although oceans are warming, and the chemistry of the seas gradually changing, William Cheung and colleagues at the University of British Columbia report in Nature that it has not been easy so far to detect any evidence of change for these reasons: because over-exploitation of the traditional fishing grounds, and greater pressure on more distant and deeper waters, made it difficult to identify any climatic effect.
http://www.climatechangenews.com/2013/05/21/fish-migration-charts-climate-change-in-the-oceans/
The migratory fishes are diadromous (anadromous and catadromous), amphidromous, oceanodromous, and potamodromous. The climate change will not affect the amphidromous fishes that migrate for the purpose of obtaining food but it will affect rest of the types of fishes because of the change in maturity and reproductive cycle of the fish due to fluctuation in temperature.
Climatic changes in precipitation will affect stream temperature both through effects of surface water runoff and groundwater recharge. Precipitation events are predicted to become more intense and may lead to large, short-term inputs of water into streams. Such runoff in more urbanized areas may lead to short-term increases in water temperature.
Source - https://www.google.co.in/url?sa=t&source=web&rct=j&url=http://www.wicci.wisc.edu/report/coldwater-fish-and-fisheries.pdf&ved=0ahUKEwjTztqQwaLYAhWJu48KHQ3PCqA4HhAWCCgwAQ&usg=AOvVaw1Bof-gY_WwdWR8LkybXaB3
Interesting project to consult :
http://www.irstea.fr/lespace-jeunesse/approfondir/les-poissons-migrateurs-amphihalins/poissons-migrateurs-et-changement
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