6 August 2014 Last updated at 08:56
By Nicola WeirBBC News
Restrictions on cod and salmon fishing aimed to rejuvenate declining stocks in the Irish Sea and inland waterways.
However, after years of tight fishing quotas from Brussels and strict angling controls, there has been no population boost in the two species.
The Agri-Food and Biosciences Institute (AFBI), which monitors numbers for the government, said global warming may hold the key to their decline.
It said this might also be affecting the eel population.
AFBI's research vessel, The Corystes, sets sail on the Irish Sea more than 200 days a year and uses the latest technology and research skills to monitor all types of marine life and its environment.
Its statistics are used by the European Commission to set fish quotas.
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