Honorary president Poj Aramwattananont said the halt to NV will see 1.3 million illegal immigrants deported.
The Labour Ministry earlier rejected calls to extend NV, which is intended to prevent accusations of using child labour, labour abuse and the hiring of illegal immigrants, after it ended last Friday.
There are 2.5 million Myanmar workers in Thailand, of whom 1.2 million are registered.
The fisheries industry uses a large amount of immigrant labour and is more prone to suspicion than others.
"NV's expiration will result in human trafficking, putting us more in danger of being downgraded to Tier 3 status by the US next year," said Mr Poj.
You cannot go onto a sugar cane plantation to inspect it without risking being shot, and all the garment labour work behind closed doors. But it's easy to see it in the fisheries industry.