Two years ago, streptococcus disease caused a great loss to Guangdong and Hainan's tilapia farmers last year, farmers in Guangxi were also not spared North Sea along the tilapia streptococcal disease cause mortality rate as high as Liu Qicheng southern China this year and does not appear large area streptococcosis.

The fundamental reason for causing the disease decreased disease resistance of farmed fish, specific to this species of tilapia, the mainly farming environmental degradation, decline in the quality of feed, farmers unscientific feeding and the abuse that led to the indiscriminate use of the drug last year streptococcal disease in the outbreak of the entire South China area. Tilapia as the South one of the most important farmed species, farming scale is very large, the pollution problems of large-scale breeding has led to the overall deterioration of the culture environment. Feed quality is also an indisputable fact, tilapia competitive materials, some manufacturers cut corners to reduce production costs led to the decline in feed quality. Farmers unscientific and unreasonable feeding also great risk, in general daily feed ration should not exceed 3% of the body weight of fish, it is recommended that fed in accordance with 2.5%, at feeding more than 2 times; temperature higher than 30 ° C when the feeding of 1.5%. Random drug drugs of abuse is also very common phenomenon, many farmers still no awareness of disease prevention, until the onset of the fierce the drugging chaos medication. Fact streptococcal disease yet there is no good ways to prevent lead farmers panic, it is precisely because no good way to prevent the indiscriminate use of the drug abuse, disease prevention and treatment lead to pathogen resistance formation gave the disease prevention and treatment to further increase difficult.

As of the end of June this year, the South China only sporadic streptococcal disease, no streptococcal disease report of a large area, the industry believes that with this year tilapia farmers feeding the few great relationship, "feeding less, Luo The growth rate of non-fish unlike past so fast, the constitution will not decline too fast, certainly will greatly reduce the incidence of Streptococcus. The aquaculture learned after the spring of this year, the South China tilapia purchase price falling remains in the doldrums, still no significant improvement in the major manufacturers, plus May tilapia extruded material price increases, farmers feeding amount reduced a lot. Recently, the rapidly soaring raw material prices, feed manufacturers have increased the extruded feed prices, the the Guangdong region's aquatic feed generally up 2-4 yuan / package. Tilapia farmers to resist the excessive growth of the extruded material price, directly taken to reduce feeding amount, or "outdated" full fed hard pellets rearing methods.