National Seafood Month: Grand Isle Oyster Hatchery to Produce Year-Round National Seafood Month: Grand Isle Oyster Hatchery to Produce Year-Round Supporting shellfish aquaculture in Louisiana Laura Wilson / Thursday, September 24, 2015 0 3150 Article rating: No rating On average, 400 million oyster larvae were produced at the Grand Isle Oyster Hatchery annually. With the recent grand opening of the new hatchery facility, 1 billion Crassostrea virginica oyster larvae can be produced annually. Read more