Oreochromis niloticus shows a higher prevalence of Beta-haemolytic streptococci when are maintained in cages than in ponds
Keywords:
pond culture, cage culture, prevalence, beta-haemolytic streptococci, Oreochromis niloticusAbstract
Positive cases of Streptococcus in tilapia cause serious economic losses, however, there are no reports on the prevalence of Streptococcus in tilapia farmed within ponds and cages in the tropics, this is the first report about it. The goal was to compare the prevalence of beta-haemolytic streptococci in tilapia (Oreochromis niloticus) from pond and cage culture farming, in Chiapas, Mexico, also, evaluate the susceptibility to antibiotics. 155 fish between 250-300 gr were collected in 31 farms (12 ponds and 19 cages). The highest prevalence (45.16%, P<0.05) of beta-haemolytic streptococci was in fish with clinical manifestations from cages, compared to fish from ponds. S. agalactiae and S. alactolyticus were identified. Signs in fish infected with Streptococcus agalactiae included exophthalmia, ascites, cerebral congestion, hemorrhages, and melanization. 100% of the S. agalactiae strains were susceptible to beta-lactams, clindamycins, among others. There is a higher prevalence of beta-haemolytic streptococci in fish farming in cages compared to pond culture. The information generated in this study favors the implementation of sanitary strategies to optimize tilapia farming in tropical regions.
http://dx.doi.org/10.21929/abavet2023.19
e2022-32
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