The trio, aged 26, 29 and 52, also allegedly misreported catch sizes, kept undersized lobsters and unlawfully sold lobsters.

Police seized a 15-metre fishing boat earlier this year after a "complex and lengthy" investigation and say the unlawful fishing came at a significant cost to the fishery.

The men received bail and will appear in court in January and February on fish trafficking charges.

The two younger men are commercial fishermen.

"With the rock lobster season about to commence, legally seafood can only be purchased from approved fishermen, wholesalers and retailers," Tasmania Police said on Thursday.

"Receipts must be obtained and in the case of purchased rock lobster, tags must he attached to the fish."

There are seven marine reserves in Tasmanian waters where rock lobster fishing is banned or subject to very strict conditions.

Australian Associated Press