Big silverfish
(silverfish) Protosalanxhyalocranius [local name] noodle fish, noodle fish, mud fish. [morphological characteristics] the individual is small, and the body length of the often mailed individual is about 15 cm. He has a slender body. The head is flat up and down. The tip of the kiss is triangular. The lower jaw is longer than the maxilla. The distance from the origin of the dorsal fin to the base of the caudal fin is greater than that to the base of the pectoral fin. Transparent body. There is a row of black pigments on each side of the ventral side. When the male is sexually mature, the anal fin is fan-shaped, with a row of scales at the base, and the pectoral fin is large and pointed. It is found in both sea water and fresh water, and is distributed from Shandong to Zhejiang coastal areas, middle and lower reaches of rivers and middle and lower reaches of rivers and affiliated lakes. [economic value] Big silverfish is a carnivorous fish, and it is also the largest individual among silverfish, so it is popular in domestic and foreign markets. The big silverfish is called Silverfish in English. Export to country: Japan. Export ports: Shandong, Liaoning, Jiangsu, Zhejiang.
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Tortoise ectoparasite
Etiology: aquatic turtles and terrestrial turtles are infected by parasites in the wild. The species of parasites are ticks, mites, fleas, leeches and so on. Symptoms: there are worm bodies on the surface of the tortoise and the tortoise is thin. Control method: remove the worm on the surface of the tortoise as soon as it is found. The newly purchased turtles were washed with 1% trichlorfon solution for 2 days. The incidence of artificially raised turtles is lower. The aquatic turtles were washed with 0.7 mg / L copper sulfate solution for 20-30 minutes, and the leeches fell off and died.
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Nuogan method to improve the efficacy of fish medicine
1. Improve the adhesive. The adhesion of the adhesive should be strong, otherwise the drug is easy to be lost in the water. Standard wheat flour is a better binder raw material. It is best to make pellet bait or ball bait for swallowing fish. 2. Adding food attractant. Fish have a sensitive sense of smell and can still be identified even if 1 gram of alanine is dissolved in 1000 tons of water. For example, the strongly scented Chinese herbal medicine star anise and Angelica dahurica are grinded into fine powder as food attractant, mixed into fish medicine at the proportion of 10%, 20%, or fried.
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