Bullacta exarata, commonly known as "spinel", "spinel", "yellow snail", "iron spit," etc., belong to the mollusks, gastropods, metacercariae, and genus snails, which are the western Pacific coast The brackish aquatic products of traditional shellfish are widely distributed in the intertidal zone between the north and south of China. Muddy meat is delicious and nutritious. It is a kind of shellfish that consumers like to eat. The coastal people in Zhejiang Province have the tradition of mudflat snail breeding. By the end of 2000, the province's breeding area had reached 170,000 mu. Due to the implementation of ecological farming, this is a light and profitable one, and the economic benefits are good. Therefore, the mud snail breeding industry is on the rise year by year. In recent years, we have observed the habitat habits and feeding habits of marine snails cultured along beaches in Zhejiang Province, and have summarized the cultivation techniques of the farming beach food organisms.
1 Inhabitation habits The mud snails in the coastal areas of Zhejiang Province are generally distributed in the middle and low tide belts, with the mid-tide zone and the factory zone being the most low-elevation zone. The mud snails have also been found in subtidal areas several meters deep, but they are rare. With the changes of seasons and environmental conditions, mud snails migrate up and down. In general, winter tide areas are low, mostly near and below the low tide line. In spring and summer, the tide area is high, and they can move up to the bottom of the high tide. . The bottom of the life of mud snails is the bottom of mud and the bottom of soft mud. It can also survive in sand mud and sandy bottom. The mud snails living in harder sediments have a harder flesh and often contain sand grains in the crop, which is commonly referred to as "nail" and the quality of the food is not good. The mud snails produced in soft mudflats are soft, tender and of good quality. Muddy camp crawls on the bottom of the mud turtle and crawls on the surface of the mudflat after ebb tide to feed. In the spring and autumn rainy days or when the weather is cold, the head plate is used to excavate the sand and submerge in the surface of the sediment. It is not easy to be discovered. When the sun is shining on the sunny day and the temperature rises, the mud is crawled on the painted surface. During the summer, it is out in the evening and rarely climbs out of the beach surface during the day during the sun.
2 diet
2.1 Types of food organisms The foods of the snails are mainly benthic diatoms and organic debris. They also feed on the eggs of some small crustaceans and invertebrates. The benthic diatoms are mainly Nitzschia, AmphFora, Pleurosigma, Gurosigma, CoscinodiscuJ, Navicula. , Pinnularia, Fragilaria, Achnanthes, Diploneis, Cyclotolla, Cocconeis, etc. species. The dominant species and number of benthic diatoms vary by season and region. In the most rapid growth of mud snail from March to June, the benthic diatoms in the beach of Cixi, Ningbo, Zhejiang Province are dominated by the genus of Rhomboid, Navicula, and Ovoid.
2.2 Ingestion Habitat The bullacta exarata is a foraging snail that uses tooth teeth to scrape mud from the surface of the beach to feed on it. When there are few algae in the mud, the mud snail uses the organic debris contained in the mud as food. Bullacta exarata is not selective for food, and the benthic diatoms ingested are basically the same in species and quantity as in the diet. The changes in the main food ingredients of snails depend on the changes in the food in their environment. For example, in the first half of the year, the nudibranch mainly feed on benthic diatoms, with many species and large numbers. The vigorous growth period coincides with the prolific growth of diatoms in natural sea areas. In the second half of the year (especially after October), the number of algae gradually increases. Decreased, the soil of snails is dominated by organic debris and grows slowly.
3 Tidal flat bait technology Beach mud mud snail farming methods mainly include flat-coating culture and aquaculture. With the rapid growth of mud snails, when observation shows that the painted surface has no sludge, it indicates that the benthic diatom is lacking and the coated surface food organisms can no longer meet the needs. At this time, the food organisms should be fertilized and cultivated until the beach surface reappears yellow-brown. Sludge. The types of fertilizers are:
3.1 Inorganic Fertilizer: Use urea as a nitrogen source and superphosphate as a phosphorus source for fertilization. Fertilizer can also be used as a compound fertilizer. After ebb tide, according to the amount of water deposited area (usual depth of 2 ~ 3cm), application of urea 10-5kg/m2, superphosphate 10-5kg/m2, usually 5 to 7 days fertilization time. 3.2 Farmyard manure: Normally, the chicken manure after fermentation is applied once every two weeks or so. The dosage is 0.06-0.08 kg/m2. The method of fertilization is to dig a 5 to 10 cm deep ditch on both sides and in the middle of the cultured mudflat to bury the chicken dung. With the fluctuation of the tide, the components in the chicken manure gradually permeate out. It can be used as a direct bait for mud snails, but also can be applied to fertilizers to promote large-scale breeding of benthic diatoms. It is a rare fertilizer in the breeding of snails.
1 Inhabitation habits The mud snails in the coastal areas of Zhejiang Province are generally distributed in the middle and low tide belts, with the mid-tide zone and the factory zone being the most low-elevation zone. The mud snails have also been found in subtidal areas several meters deep, but they are rare. With the changes of seasons and environmental conditions, mud snails migrate up and down. In general, winter tide areas are low, mostly near and below the low tide line. In spring and summer, the tide area is high, and they can move up to the bottom of the high tide. . The bottom of the life of mud snails is the bottom of mud and the bottom of soft mud. It can also survive in sand mud and sandy bottom. The mud snails living in harder sediments have a harder flesh and often contain sand grains in the crop, which is commonly referred to as "nail" and the quality of the food is not good. The mud snails produced in soft mudflats are soft, tender and of good quality. Muddy camp crawls on the bottom of the mud turtle and crawls on the surface of the mudflat after ebb tide to feed. In the spring and autumn rainy days or when the weather is cold, the head plate is used to excavate the sand and submerge in the surface of the sediment. It is not easy to be discovered. When the sun is shining on the sunny day and the temperature rises, the mud is crawled on the painted surface. During the summer, it is out in the evening and rarely climbs out of the beach surface during the day during the sun.
2 diet
2.1 Types of food organisms The foods of the snails are mainly benthic diatoms and organic debris. They also feed on the eggs of some small crustaceans and invertebrates. The benthic diatoms are mainly Nitzschia, AmphFora, Pleurosigma, Gurosigma, CoscinodiscuJ, Navicula. , Pinnularia, Fragilaria, Achnanthes, Diploneis, Cyclotolla, Cocconeis, etc. species. The dominant species and number of benthic diatoms vary by season and region. In the most rapid growth of mud snail from March to June, the benthic diatoms in the beach of Cixi, Ningbo, Zhejiang Province are dominated by the genus of Rhomboid, Navicula, and Ovoid.
2.2 Ingestion Habitat The bullacta exarata is a foraging snail that uses tooth teeth to scrape mud from the surface of the beach to feed on it. When there are few algae in the mud, the mud snail uses the organic debris contained in the mud as food. Bullacta exarata is not selective for food, and the benthic diatoms ingested are basically the same in species and quantity as in the diet. The changes in the main food ingredients of snails depend on the changes in the food in their environment. For example, in the first half of the year, the nudibranch mainly feed on benthic diatoms, with many species and large numbers. The vigorous growth period coincides with the prolific growth of diatoms in natural sea areas. In the second half of the year (especially after October), the number of algae gradually increases. Decreased, the soil of snails is dominated by organic debris and grows slowly.
3 Tidal flat bait technology Beach mud mud snail farming methods mainly include flat-coating culture and aquaculture. With the rapid growth of mud snails, when observation shows that the painted surface has no sludge, it indicates that the benthic diatom is lacking and the coated surface food organisms can no longer meet the needs. At this time, the food organisms should be fertilized and cultivated until the beach surface reappears yellow-brown. Sludge. The types of fertilizers are:
3.1 Inorganic Fertilizer: Use urea as a nitrogen source and superphosphate as a phosphorus source for fertilization. Fertilizer can also be used as a compound fertilizer. After ebb tide, according to the amount of water deposited area (usual depth of 2 ~ 3cm), application of urea 10-5kg/m2, superphosphate 10-5kg/m2, usually 5 to 7 days fertilization time. 3.2 Farmyard manure: Normally, the chicken manure after fermentation is applied once every two weeks or so. The dosage is 0.06-0.08 kg/m2. The method of fertilization is to dig a 5 to 10 cm deep ditch on both sides and in the middle of the cultured mudflat to bury the chicken dung. With the fluctuation of the tide, the components in the chicken manure gradually permeate out. It can be used as a direct bait for mud snails, but also can be applied to fertilizers to promote large-scale breeding of benthic diatoms. It is a rare fertilizer in the breeding of snails.
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