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While commercial fishing remains canceled for a third consecutive year, fishery regulators recently decided to allow a limited season for recreational fishing on certain dates and with strict quotas.

"As the vessel remains subject to an ongoing investigation by French fisheries authorities, we are unable to comment further at this time," a government spokesperson added.

Barry Young, of Brixham Trawler Agents, described the influx as "an invasion" and said the octopus were "decimating the crab fishery at the minute".

In some parts of the world - including Australia, the US and the Pacific - marine heatwaves can destroy coral reefs or local fisheries, as well as vital seagrass meadows.

Morgan argued that the Welsh shellfish industry, "which is actually much greater than our fisheries industry sector, are very happy".