Document Type : Original research
Authors
1
Universidade Federal de Santa Catarina – UFSC, Departamento de Aquicultura, Laboratório de Camarões Marinhos – LCM. Rua dos Coroas, 503, Barra da Lagoa, CEP: 88061-600, Florianópolis, SC, Brazil
2
Universidade Federal de Santa Catarina – UFSC, Departamento de Bioquímica, Laboratório de Biomarcadores de Contaminação Aquática e Imunoquímica – LABCAI. Servidão Caminho do Pôrto, 1, Itacorubi, CEP: 88034257, Florianópolis, SC, Brazil
Abstract
This study aimed to evaluate the in vivo effect of the macroalgae Ulva ohnoi, alone and combined with the probiotic Lactobacillus plantarum, on zootechnical, immunological, and microbiological performance, thermal resistance and survival of Litopenaeus vannamei challenged with Vibrio parahaemolyticus. The shrimp were fed four diets: control, seaweed, probiotic, and a combination of seaweed + probiotic. After six weeks, a significant difference between the control and probiotic, and the control and seaweed treatments was demonstrated in shrimp challenged with Vibrio, with the highest percentage of mortality being observed in the group fed only with seaweed, followed by probiotic, seaweed + probiotic, and control. The control and seaweed treatment groups also showed a significant difference in resistance to thermal shock. The animals treated with the control diet had the highest mortality rate, followed by seaweed + probiotic, probiotic, and seaweed. The zootechnical, immunological, and microbiological parameters did not differ significantly among treatments. In conclusion, the use of U. ohnoi alone demonstrated a positive effect on thermal shock resistance but did not demonstrate protection against infection caused by V. parahaemolyticus. On the other hand, its combined use with L. plantarum in the diets did not have a positive effect on the parameters evaluated.
Keywords
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