The fishing industry has expressed concern that a no-deal Brexit could see a significant amount of EU vessels arriving into Irish waters.
Patrick Murphy, CEO of the Irish South and West Fish Producers Organisation, told the Oireachtas Committee on Agriculture and the Marine that ultimately the Common Fisheries Policy would have to be "re-examined" if this were to happen.
"We're wondering if there will be a new quota share for Irish boats, or if we'll have to stick with the same agreement", he said.
Mr Murphy, along with Seán O 'Donoghue of the Killybegs Fishermen's Organisation, told politicians today that the fishing industry should be not be seen as a sector to be traded, during Brexit negotiations.
Mr O'Donoghue said that it was a "myth" that the UK did not benefit from the Common Fisheries Policy.
Now that the UK is leaving the EU, he said, it cannot expect to take those gains with them.
Earlier, speaking on RTÉ's Morning Ireland, Mr O’Donoghue said the Killybegs Fishermen's Organisation has received assurances "all round" that fisheries will not be isolated from the overall Brexit trade agreement.
Mr O'Donoghue said that if preferential access is given to the UK for a range of other internal market services, there has to be a reciprocal arrangement for fishing access.
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Mr O'Donoghue said it has been made "crystal clear" that postponing a deal on fisheries 'is akin to a no deal scenario for us" and it would result in the fishing industry having none of the leverage of other sectors in negotiating its position.
He said such a decision would lead to the demise of the seafood sector in Ireland and that employment in the industry would drop by 5,000 out of a total of 16,000, which is huge in coastal areas.
Meanwhile, Minister for Agriculture and the Marine Charlie McConalogue has said that a status-quo deal has been agreed for fishermen for the first three months on 2021 so they can continue to fish post-Brexit.
Speaking on RTÉ's Today with Claire Byrne, he said that the quota levels have been set temporarily for Irish fishermen based on what way they fished at the start of this year.