Shrimping Question

[Duck Butter]

Was on Grand Isle last week and there were TONS of trash on the beach. I understand that with a south wind everything is coming onto the beach. Well, we saw several actual bags of trash along the beach. At first thought maybe someone is picking up trash and leaving it for someone in a truck to come and pick up the bags. Talked to some locals and they say that more than likely it is the trawlers that are just bagging up their trash and throwing it into the GULF There are no laws regulating this?

I hope there is a better explanation, but surely this can not be the case. As many regs as there are for oil and gas exploration, surely trawlers can offload their trash along with the shrimp?