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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Early production of raw fish-- breeding of parent fish in hot spring water
The profit of selling seedlings early is not high, mainly to win over customers. Raw fish in hot springs? That's right. Recently, a reporter from Southern Rural Daily visited Triangle Town in Zhongshan City and learned that in order to produce early seedlings at the end of the first month of the lunar calendar, a raw fish seedling farm did not hesitate to spend money on breeding parent fish with hot spring water to meet customer requirements and seize the market opportunity. The purpose of this is to promote the gonads of parent fish to mature under natural conditions for seedling production. Liang Guihong, Yurong Aquatic breeding Farm, Triangle Town, Zhongshan City, told reporters that on January 10, 2009,
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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) Extrusion method: ① uses thumb and
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