Based on average landings of red snapper from 2012-2014 and using 2016 Seafood Watch ratings, the sustainability breakdown of red snapper is as follows:

Within the landings for the U.S. that meet  a "Good Alternative" recommendation, the breakdown by states are: Texas* ~35-40%, Florida and Louisiana ~30% each, and Alabama and Mississippi ~1-3% each. The majority of unrated U.S. red snapper comes out of Florida. 
*Information on Texas was inconclusive, so all landings from Texas were assigned a "Good Alternative" recommendation. 
FishChoice's red snapper sustainable seafood guide

Located amongst the pristine glacial waters of Mount Cook’s Aoraki peak, Aoraki Salmon has been providing discerning customers with fresh Chinook salmon since 1999. Aoraki Salmon controls every stage of the farming process to ensure quality and traceability from egg to maturity. The company's salmon are raised to maturity in an environment free of antibiotics, hormones, or steroids. To ensure the freshest product available for their customers, salmon are transported from the the water to export within 24 hours without exception. The resulting products of Aoraki Salmon’s long and thoughtful farming process includes a variety of fresh, value-added, and specialty products that are naturally low in fat and a healthy source of omega-3 vitamins.. Read more...