Stone crab
English name: Charybdis (Charybdis) natator
Common name: good swimmer
Outline: Portunidae
Place of origin and date of delivery:
Distributed in China (Guangxi, Guangdong, Fujian, Taiwan), Japan, Indonesia, Philippines, Malay Islands, Thailand, India, Madagascar and the east coast of Africa. Inhabit the sandy or sandy bottom.
Introduction:
The head and chest nail is raised, the surface is densely covered with villi, the surface mask of the head and chest nail near the base of the anterior teeth; the posterior part of the head and chest nail has granule ridges of different length; the forehead has 6 teeth, the central 4 teeth are similar in size, and the leading edge is obtuse; the anterior edge has 6 teeth, the end of the first tooth is flat and obtuse, the second to fourth teeth are similar in size, the end is sharp, and the end teeth are thorn-shaped; there are granular ridges on the posterior and posterior edges. Chelate feet stout, unequal, wrist and metacarpal surface mask flattened granules; palmar segment abaxially with 5 spines, granules on the inner and outer sides arranged in a row.
Body color:
The brown cloth of the head and chest nail is red mottled and the chelate feet are roughly bright red.
Body length of the specimen:
The male head and chest nail is 69.0mm long and 103.0 mm wide.
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The overfishing of deep sea fish is more endangered than the panda.
A variety of deepwater fish in the Atlantic Ocean have been overhunted by humans, and the situation is so serious that even the giant panda and the Bengal tiger are more endangered, according to a new study by Canadian scientists. Canadian biologists studied five species of deep-sea fish in Canadian waters from 1978 to 1994 to understand the serious impact of coastal fishermen's shift to deep-sea fishing on marine ecology. Scientists have found that in 17 years, the five fish species have plummeted by at least 87%, to as much as 98%. they
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fish skin congestion
This disease is mainly due to insufficient light, poor water quality or excessive new water stimulation. Symptoms The skin of the diseased fish has dark red patches of different sizes, covering both sides, and the appetite is obviously reduced. The light affects the viewing, and the serious one leads to death. Diagnosis and countermeasures: a, 0.2 grams of furacilin powder and 250 grams of salt dissolved in 10 kg of water, soaked in sick fish for 10~20 minutes. b. Extend the light duration of the aquarium. c. Dip the diseased fish in low concentration potassium permanganate solution for 10 hours. d. Sprinkle with saline
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