Van Tan Nguyen faced Joondalup Magistrates Court on August 1 on accusations he kicked a bag of fish off a rock wall at Hillarys Boat Harbour in March after a Fisheries officer approached him.
The officer saw four fish fall from the bag, but an undersized tarwhine (silver bream) was recovered.
The fish measured 170mm. The minimum legal length is 250mm. Nguyen was fined $1776.90.
North Metropolitan compliance manager Todd A’Vard said fishers who obstructed Fisheries officers could be fined up to $10,000 and be jailed for a year.
‘Fisheries officers need the protection of the law, as they carry out the important task of protecting the State’s fish resources from exploitation,’ he said.
It was the third time Nguyen had been convicted of illegal fishing.
In 2010 and 2011, he was found guilty of possessing undersized fish and exceeding his daily bag limit.