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Fish study shows genetic changes result in weaker stocks

Overfishing is changing the genetic makeup of fish stocks, according to scientists at Bangor University.

They have found that because larger fish are being caught, they are unable to pass on their genes to a new generation and only smaller, less fertile, fish are surviving.

Professor Gary Carvalho, of Bangor University's School of Biological Sciences, told Peter Johnson on BBC Radio Wales, more about the research.

Big fish catches 'mean smaller fish'

  • 18 Mar 2013