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It is also important for migratory fish and a nursery for juvenile fish.
BBC: Welsh estuaries are granted special conservation status
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Removing the dam restored 17 miles of prime spawning and rearing habitat for migratory fish, and re-established numerous rapids for more recreation.
CNN: Study opens floodgates on dam removal
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The agency says the area, near the Slimbridge Wetland Centre, is of "international importance" for migrating wildfowl, breeding waders, migratory fish and Atlantic eels.
BBC: Work carried out to protect Severn Estuary salt marshes
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Both estuaries are important areas for migratory fish.
BBC: Welsh estuaries are granted special conservation status
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While it was still early in the season to be jumping to conclusions, the Gulf coast native fears the migratory paths of fish went haywire after the oil spill.
WSJ: Gulf's Fishing-for-Fun Culture Also Takes Hit
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As approximately 66% of the Mekong fish species are migratory their passage will be blocked by the dam in its current design which will seriously reduce the reproduction rate and overall fish populations downstream will be reduced.
CNN: STORY HIGHLIGHTS
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Sea turtles, elephant seals and many other fish, including eels, tuna and sturgeon, have a similar migratory strategy, he added.
BBC: Sockeye salmon 'sense magnetic field of home'