Methods of treating aquatic or marine animal water bodies including contacting the water body with one or more sulfur oxidizing bacteria such as those selected from the genus Paracoccus in an amount sufficient to control, reduce, or eliminate the H2S in the water body is disclosed. One or more sulfur oxidizing bacteria selected from the genus Paracoccus are applied to H2S contaminated environments in a predetermined amount effective in improving the yield and quality of aquatic or marine animals therein. Compositions useful for treating aquatic or marine animal water bodies are also described.
