Poaching could pose a serious threat to a valuable resource in Manx waters.
It is the time of year when newly reared trout and salmon are released to replenish stocks.
There is only a slim chance of survival for the salmon anyway, and in the past poachers have assisted in their demise.
John Ballard from the Fish Hatchery at Ballaglass is urging people not to buy salmon offered to them, and instead report anyone trying to sell their illegal catch.
He explains why salmon stocks are so precious:
Hopes DOI and striking bus drivers could meet
Unite the Union members are about to enter a third round of industrial action
Blocked gullies found to be cause of Castle Street flood
Problems 'not linked to the sewerage system'
'Only a very small number' needing support cashing benefits cheques
Minister confident those yet to cash cheques can access payments
Samantha Barks throws support behind wind turbine petition
'Many of us believe this would permanently change the character of our Island'