Microbiological quality of Litopenaeus vannamei culture using conventional and biofloc systems |
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| Authors: | Camila Brito Bruna do Valle Juliana Interaminense Silvio Peixoto José Vitor Lima‐Filho Roberta Soares |
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| Affiliation: | 1. Laboratório de Tecnologia em Aquicultura (LTA), Universidade Federal Rural de Pernambuco (UFRPE), Recife, Brazil;2. Laboratório de Enzimologia (LABENZ), Universidade Federal de Pernambuco (UFPE), Recife, Brazil;3. Laboratório de Microbiologia e Imunologia (LAMIM), Universidade Federal Rural de Pernambuco (UFRPE), Recife, Brazil |
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| Abstract: | Shrimp farming is a fast‐expanding activity that has supported the growth in the supply of these crustaceans to consumers around the world. However, the end product is vulnerable to contamination at all stages of the process, including the rearing tanks, where current practices prioritize to raise stocking densities and the minimization of water renewal. It is thus important to evaluate the potential of these systems for the proliferation of undesirable microorganisms, which may render the product unfit for human consumption. In the present study, the presence of coagulase‐positive Staphylococcus, Salmonella spp., Vibrio spp., and total and thermotolerant coliforms was verified in biofloc tank and conventional pond systems used for the rearing of Litopenaeus vannamei in Pernambuco, Brazil, and the results were compared with the legislation regulating the marketing of fresh shrimp. Samples were collected from two biofloc tanks with a density of 375 shrimp m?2, and two conventional ponds with 12 shrimp m?2. None of the samples tested positive for either Salmonella spp. or coagulase‐positive Staphylococcus, which is consistent with the legislation. While no standards are defined legally for Vibrio spp. or coliforms, very low concentrations were recorded in both systems, in comparison with other studies. While some variation in bacterial contamination was observed over the rearing process, the end product of both systems was fit for human consumption. The results of the study indicate that, while the water is not renewed in the biofloc system, the development of undesirable microorganisms can be controlled, with no adverse effects for the end product. |
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| Keywords: | coliforms coagulase‐positive Staphylococcus
Salmonella
Vibrio
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