Four foreign fishing boats have been intercepted by the Australian Border Force in waters off the Tiwi Islands.
Police intercepted the vessels in August, all from Indonesia.
Authorities say they also found more than 100 kilos of sea cucumber aboard one of the vessels, and 280kg of sea life on another.
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The crews of the vessels will now be transported to Darwin while further investigation is carried out by the Australian Fisheries Management Authority.
The boats have been disposed of, in accordance with Australian law.