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Toxicity tests to assess the effect of a synthetic tank liner on shrimp survival and nitrification in a recirculating superintensive production system

Toxicity tests to assess the effect of a synthetic tank liner on shrimp survival and nitrification in a recirculating superintensive production system

Aquacultural engineering 24(2): 91-105

Episodes of shrimp mortality occurred during the growth of Litopenaeus setiferus in a recirculating, superintensive production system. An EPDM liner that was used to line the shrimp tanks was suspected of being toxic to the shrimp. This hypothesis was tested with shrimp grown in small tanks in the presence or absence of the liner. In the presence of the liner, all the animals died within two weeks. Control animals, not exposed to the liner, had 100% survival during the same period. Additionally, ammonia accumulation was noted in the shrimp production tanks which contained liner. A second test was conducted where nitrifying bacteria, in the absence of shrimp, were exposed to the liner. In the presence of the liner, ammonia and nitrite removal ceased completely within a few hours, whereas the controls demonstrated fast and efficient ammonia and nitrite removal. The EPDM liner apparently released chemicals that were toxic to both shrimp and nitrifying bacteria. This resulted in shrimp mortality and elevated ammonia levels in the recirculating shrimp production system. This paper describes toxicity tests that identified the liner's potential danger. These tests can be applied to select nontoxic materials for use in aquaculture facilities. The work has general application to material selection and demonstrates the need to consider both direct and indirect effects of toxicity in recirculating systems.

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Accession: 003600254

Download citation: RISBibTeXText

DOI: 10.1016/s0144-8609(00)00066-2

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