Fisheries Minister Gordon Hill has issued a strong warning to commercial rock lobster fishermen who try to dodge home porting restrictions by transporting their catch on other boats.
Mr Hill said boat operators attempting to bypass the restrictions could face serious penalties.
"It has been brought to my attention that some fishermen operating south of Leeman are considering the use of other fishing boats to transport their catch south to Fremantle, rather than landing it at their nominated home port," he said.
"The conservation controls for this season, including home porting, are crucial for the long-term future of the fishery.
"Any action by fishers which might jeopardise plans to boost breeding stock this year, is grossly irresponsible, and will be severely dealt with.
"It is illegal for any vessel to carry the catch of another, unless it is licensed as a carrier boat under the Fisheries Act.
"Fishing boats which accept another boat's catch, face a $700 fine and the prospect of a conviction being recorded against their own boat.
"I would urge fishermen not to abuse the rules because if a boat accumulates more than three convictions in a 10-year period, the fishing licence is cancelled.
"This would be a severe blow, as the licence for an average rock lobster vessel is worth more than $1 million to the boat owner - the risk of having the licence cancelled is just not worth it."