The meat can be eaten fresh, or it can be processed into dried razor clams, clam oil, etc. Pen Fun Pavilion www.biquge.info has a long history of breeding in China, with Fujian and Zhejiang producing the largest, and there are artificial breeding.

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Clams are a common name for the molluscs of the family Solenidae. It is also known as the razor emperor, the holy son, the bamboo locust, and the dragon. The shells are long, nearly columnar or ovate, and the two shells are equal. The front and rear ends are open, the front end is a foot hole, and the rear end has a water pipe sticking out. The top of the shell does not protrude, and its position varies from species to species, some at the very front of the shell, and some slightly in the center of the shell. The foot is extremely developed, long columnar, and has no filaments. China's coastal areas are produced, Jiangsu, Fujian, Shandong, Zhejiang is a famous production area, people also often in the sea salinity is low (adaptation range in the range of 4-28‰) near the estuary and the inner bay soft mud mud mudflats to build "clam fields", artificial breeding. Among them, razor clams and long bamboo clams have great economic significance and are the main breeding objects. The razor clams grow up within a year, and the body length is mostly about 4 cm, which is a one-year clam or a new clam, and is harvested in July and August; If you continue to stocking until the next year, it is generally about 7 cm, called two-year clams or old clams, and they are harvested in March and April. At present, only one-year and two-year-old clams are raised.

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Each razor clams have a clear, nematode-like thing in their body, which is an organ in the clam's digestive system, called a "crystal rod", which is edible. When the razor clams eat, the crystal rod is used as a blender to drive the peristalsis of the stomach and intestines and promote the digestion of food; When razor clams are hungry, the crystal rod will automatically dissolve and be used to satisfy hunger. Generally, razor clams that have been placed for a long time will not have crystal rods in their bodies, and razor clams will cause the crystal rod to dissolve in the order of dissolution time due to the speed of their own enzyme decomposition, so even if they are fresh clams caught at the same time, some have crystal rods and some do not.

Crystal rods.

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It is a normal and essential organ in the digestive tract of mollusks such as valvular gill (i.e., bivalve shellfish) and gastropods (i.e., snails, snails, etc.), and it is a translucent gelatin-like rod full of digestive enzymes. You could think of it as a stick-shaped "ink ingot" in the stomach of these two types of mollusks, which rotates and collides with a hard structure in the middle of the stomach as it is digested, releasing digestive enzymes.

Of course, the parasite on the body of razor clams is generally a creature called "clam-eating intestinal fluke", which is yellow-white, milky-white, and about 2 centimeters long, which is completely different from the crystal rod. The parasitic razor clams are emaciated and unable to reproduce, and more than one living cram crawls out if its abdomen is squeezed. If people eat cooked razor clams containing parasites, they are generally fine, but those with poor gastrointestinal function may have indigestion and other reactions.

Habitat and distribution editing

distribution

It is widely distributed along the north and south coasts of China, and is also distributed in Japan. It is an important breeding species in the coastal areas of Fujian and Zhejiang. Razor clams are all seafood, and there are more than 20 common species. Most of them are temperate and tropical, and live in shallow sea beaches or mud beaches in the middle and lower intertidal zones or subtidal zones; A few species live at deep seafloors, while others live in estuaries or inner bays in soft mud substrates with a little freshwater injection and low salinity.

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I like to live in the inner bay where the wind and waves are calm, the tide is smooth, the bottom is soft, and there is fresh water injected. With the rise and fall of the tide, it moves up and down in the cave. When the sea water is submerged, it rises to the along**, stretches out the inlet and outlet pipes, and carries out activities such as breathing, feeding, and excretion. When the beach is dry and dewy, it descends to the middle of the cave or the bottom of the hole. The depth of the clam varies with the size of the clam, the strength of the body, and the change of substrate and season. Usually the clams are large, strong, soft in the bottom, and when the water temperature is low, they live deeper; On the contrary, when the clams are small, weak, hard, and warm, they are shallow in lurking. Generally, the depth of incubation is 5~6 times the length of the body. According to the size of the inlet and outlet holes and the spacing between the two holes on the tidal flat, the size and fat of the clams can be judged. If the inlet and outlet holes on the beach are obvious, and there is a soil bulge around the outlet hole, it means that the clam body is strong.

Live upside down in a handstand along the hole, with the front end facing down and the back end up. 1 hole**, no two razor clams appear at the same time. In general, juveniles have a strong ability to move. Under normal circumstances, adult clams do not leave their burrows and move to live elsewhere.

Broad-temperature shellfish, razor clams living in the north, can tolerate low temperatures of 0~-3 °C in winter; The razor clams, which live in the south, can still live for a period of time at a temperature of 39°C. The suitable water temperature for the growth of razor clams is 15~30 °C. In the right temperature range, the higher the temperature, the faster life will be. The adaptation range of the specific gravity of the razor clams to seawater is 1.005~1.020, and the low proportion in this range is beneficial to the growth of the clams.

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Dioecious, 1-year sexual maturity, gonads distributed in visceral sacs. The male gonads are milky white, and the female gonads are pale yellow. The breeding season varies from place to place. The North is earlier than the South. The breeding season of Liaoning razor clams is in late June; Shandong August ~ September; Zhejiang and Fujian continue from late September to January of the following year, and the peak breeding season occurs from mid-October to mid-November, which is equivalent to the three solar terms of cold dew, frost and beginning of winter. During the whole breeding period, there are 4 concentrated discharge of sperm eggs, and the interval between each breeding is half a month. The discharge was the highest in the first and second times, and the sperm and eggs were of good quality. The time of reproduction is generally during high tides. Mature broodstock are stimulated by changes in the external environment, especially the sudden drop in water temperature, which will cause sperm and egg discharge. The sperm and eggs of razor clams are excreted from the body and fertilized and developed in seawater. The fertilized eggs hatch through cleavage, develop into "D" shaped larvae, and after a period of floating life, mature and metamorphosis, and then after a short period of creeping life, they dive into the mud and begin to burrow life. In the whole life cycle, when the water temperature is 20~24°C, the whole time from the start of the fertilized egg to the transfer to the benthic burrowing life is about 7~10 days.

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The silky clam (Sinonovacula constricta Lamarck) is commonly known as the clam (Fujian), the dragon (Zhejiang) or the clam (Shandong, Hebei, Liaoning). The shell is long ovate or cylindrical, with rounded corners at the corners. The shell surface is yellow or yellow-green, and there is a concave oblique groove from the top of the shell to the ventral margin, which resembles a scar. The top of the shell is low, the chitin is brittle and thin, like two pieces of broken bamboo, which are vertically inserted into the shallow sea sediment when living; The mantle is milky white and translucent, and the left and right mantles are hugged to form a mantle cavity. The outlet and inlet pipes are well developed and extend to the outside of the shell. The foot is strong, somewhat cylindrical, surrounded by a mantle with tentacles. The male glands are white, and the female glands are pale yellow.