Yuhang, Zhejiang: big fish farmers seek to transform hybrid blackfish

Zhejiang online, April 14, "Hybrid black fish fry, I would like to order 1 million." A few days ago, Li Guoxu, a big farmer in Xinyu Village, Yuhang Canal Street, Hangzhou, called the district fishery administration station to raise hybrid black fish in his 100 mu fish pond.

Li Guoxu has kept black fish for more than a decade. Since last year, he has gradually changed the original local black fish into hybrid black fish.

Why change the fish species? Lao Li told reporters that in addition to hybrid black fish can resist high temperature, more importantly, it can also reduce the discharge of wastewater from farms.

Li Guoxu calculated an account for the reporter: local black fish eat frozen small fish, and the cost of raising one jin of black fish is about 9 yuan. when it is hot, they have to change water for the fish ponds every other week or two; hybrid black fish eat expanded feed, which costs only 7 yuan per catty, and only needs to change the water once or twice a year.

"if frozen small fish are used as feed, the water in the fish pond will gradually become turbid and there will be the problem of eutrophication. In contrast, the effect of expanded feed on water quality is much smaller. " The reporter followed him to check several fish ponds, and some fish ponds with hybrid black fish can even see the soil at the bottom.

The area where Li Guoxu's fish pond is located is the Blackfish Industrial Park planned for Canal Street in 2011, with a total of more than 800 mu, where aquaculture wastewater passes through ditches into the tail water treatment pond. Since changing the species of black fish, Li Guoxu has found that much less waste water is discharged.

Dai Yanping, a cadre of the agricultural department in Canal Street, who is investigating the farm, said that in the past two or three years, with the vigorous promotion of the local government, many farmers, like Li Guoxu, have begun to switch to hybrid black fish. "Agricultural non-point source pollution will have to be rectified sooner or later, and the aquaculture industry will face more and more pressure on environmental protection. instead of waiting for rectification before thinking about change, it is better to start planning transformation and upgrading as soon as possible." Li Guoxu said.