The 95-metre trawler was forced to dock in Victoria last month after it killed eight dolphins and four fur seals in less than two weeks while fishing in the Small Pelagic Fishery.

On Sunday, Small Pelagic Fishery Industry Association chairman Grahame Turk said the trawler had returned to the fishery for daylight fishing only, after it satisfied stakeholders that all future dolphin deaths could be avoided.

"The operators have made considerable investment in new technology aimed at reducing risk of dolphin interactions," he said.

"AFMA's (the Australian Fisheries Management Authority) conditions make this the most tightly regulated mid-trawl fishery in Australia. The association and the operators of The Geelong Star share the community's concern about harm to dolphins as an iconic species."

A new type of barrier net has been mounted inside the mouth of the Geelong Star's net to specifically keep dolphins out.

The barriers are made from 200 millimetres of mesh grid.

This device sits closer to the mouth of the net than the existing marine mammal excluder device.

Regulations now require the Geelong Star to have camera coverage across its deck so the regulator can have 24/7 coverage of the vessel's operations.

SPFIA said an AFMA observer would also remain on board for at least a year from its first fishing trip, while one of the Geelong Star's crew has a wildlife observer's qualification and will be the designated dolphin spotter on board.

TARFish chief executive Mark Nikolai does not expect the vessel to kill any more marine mammals.

"Following previous advice by AFMA and the operators of the Geelong Star that world's best marine mammal excluder devices were fitted to the vessel, I am hopeful that the additional mandatory management measures required by AFMA will not result in a repeat of the eight dolphin and four seal deaths caused by the Geelong Star in its first two fishing trips, as it recommences fishing operations in the small pelagic fishery."