Ngưỡng mật độ Streptococcus agalactiae gây bệnh Streptococcosis ở cá rô phi (Oreochromis sp.) nuôi ao nước ngọt

Abstract

Tilapia (Oreochromis sp.) is one of the key aquaculture species in Vietnam. In freshwater environments, tilapia is most affected by S. agalactiae, but information on S. agalactiae density threshold causes disease in tilapia has been limited. The purpose of this study was to determine the S. agalactiae density threshold causing disease Streptococcosis on tilapia and some related environmental factors such as DO, temperature, pH, NH3, NO2-N. The results showed that S. agalactiae causes tilapia had typical pathological manifestations when the density of S. agalactiae in fish liver and pond water fluctuated in the range of 1.1x107-2.9x108 cfu/g and 1.0x103-1.2x104 cfu/ml, respectively. Fish infected with S. agalactia showed no pathological symptoms when the S. agalactiae density in fish liver and water ranged from 1.3x103-9.6x105 cfu/g and 2.3x101-8.3x101 cfu/ml, respectively. The density of S. agalactiae in water, temperature, NH3, and pH affected the density of S. agalactiae in fish. The highest probability of disease occurrence was 98.3% when the density of S. agalactiae in water was ≥103 cfu/ml, followed by 71.4% when the temperature was ≥31oC, 25.9% when NH3>0.1 mg/l, 14.01% in case NO2-N>0.05 mg/l, and the lowest was 0.07% when DO<4 mg/l.