Many of the oysters are farmed on leased areas nowadays, so some carefully tended shellfish sources could be destroyed.
The costs to fishermen and shellfish harvesters could run into many millions as well as putting a lot of people out of work. There are 3500 oyster harvesters in Louisiana.
In 2006, Texas oysters generated $17 million in sales.

Now they are considering trying to plug the hole with trash. I dunno, the formation has a lot of pressure.