of antibiotics, fungicides, algaecides, pesticides, fertilizers, etc.
If my shrimp ain't local Gulf 'wild' shrimp, I ain't eatin' 'em.
"Ecological impacts
Shrimp farms of all types, from extensive to super-intensive, can cause severe ecological problems wherever they are located. For extensive farms, huge areas of mangroves were cleared, reducing biodiversity. During the 1980s and 1990s, about 35% of the world's mangrove forests have vanished. Shrimp farming was a major cause of this, accounting for over a third of it according to one study.
Intensive farms, while reducing the direct impact on the mangroves, have other problems. Their nutrient-rich effluents (industrial shrimp feeds disintegrate quickly, as little as 30% are actually eaten by the shrimp with a corresponding economic loss to the farmer, the rest is wasted<3>) are typically discharged into the environment, seriously upsetting the ecological balance. These waste waters contain significant amounts of chemical fertilizers, pesticides, and antibiotics that cause pollution of the environment. Furthermore, releasing antibiotics in such ways injects them into the food chain and increases the risks of bacteria becoming resistant against them."
http://en.wikipedia.org/wiki/Shrimp_farm