The method of testing the quality of eel seedlings when purchasing eel seedlings
The main results are as follows: (1) Water inspection method: put the purchased eel seedlings into a container, add appropriate amount of open-air water and let them sit for 3 to 5 minutes.
(2) Seismic test: remove the eel seedlings floating on the surface after water inspection, then rest quietly for another 3-5 minutes, and hit the container with hands or feet. The eel seedlings of good quality react strongly, and head down, tail up or try to escape; poor quality eel seedlings, slow response, head up, tail down, curling, twitching or belly, etc.
(3) squeeze method: ① squeezes the thumb and index finger into a hoop, and pulls the eel body from top to bottom to see if it has a stalk feel; ② uses his thumb to press @ # @ 236 feet @ abdomen, from the middle to the anus to see if there is yellow purulent mucus. If so, it means that the eel seedlings are sick.
(4) the method of lifting "fish": lift the eel to see if its tail is ticked upward. It is good to tick strongly, and it is inferior eel that does not tick or is not strong.
- Prev
Fish visceral mycosis
Pathogenic water mold. The diseased fish generally have a bloated abdomen with erythema on the surface of the abdomen. dissecting the abdomen can be seen that the surface of the visceral mass is covered with fine hyphae, and there are erythema in the stomach, swim bladder and liver. Initially infect the stomach, fully develop in the stomach, the hyphae pass through the gastric wall, develop in the abdominal cavity, cause ascites, and invade nearby organs as well as peritoneum and muscles. After the sick fish died, the hyphae protruded from the abdominal wall. Prevention of 100ppm methylene blue can prevent its development, and using it to disinfect fish ponds can reduce infection.
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How to improve the utilization rate of idle fish ponds in winter
After merging ponds in winter to releasing summer flowers in the following year, most fish ponds have a free period of about half a year. If they are comprehensively utilized, the utilization rate and economic benefits of fish ponds can be greatly improved. Here are four ways to make use of winter fry ponds. The cultivation of adult fish in winter fallow ponds can not only increase production, but also adjust the "summer shortage" of the aquatic product market. Due to the short culture period and low temperature, the following techniques should be adopted: ① should be released in advance, that is, after the fish species are merged into the pond.
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