Yi Chen, XueGuang Ge and Yunbin Lin were crabbing in Falcon in January.
Fisheries officers watched the three accused put crabs into their bucket.
When the men became aware they were being watched, Fisheries officers saw them throw the buckets in the bush.
More than 155 crabs were discovered by Fisheries officers, 152 of them undersized. During a recorded interview, Ge gave Fisheries officers a false name.
Lin and Chen were fined $500, and Ge was fined $1200. All were ordered to pay a mandatory penalty of $1467.90.
Suliasi Mocevakaca was found guilty of using a net in closed waters
He was fined $500, ordered to pay a mandatory penalty of $2170, costs of $169.10 and his net was forfeited.
Xiyou Wang, Xiangliang Song and Yajuan Want were found guilty of possessing a totally protected fish.
Fisheries officers found them with 68 crabs; 63 of them were undersized.
Wang was fined $1000 and ordered to pay a mandatory penalty of $3150.
Song was fined $1000 all up and ordered to pay a mandatory penalty of $3150.
Wang was fined $500 and ordered to pay a mandatory penalty of $3150.
Ming Wu, Sun Wang, Mingyin Ng, Dunan Sun appeared on charges of having possession of 148 undersize crabs.
Their case was adjourned until April 5 pending legal advice.