Method of screening and separating Chinese mitten juvenile crabs in batch mode

Abstract

The invention provides a method of screening and separating Chinese mitten juvenile crabs in a batch mode. A net cage and a daylight lamp are arranged. The method is characterized in that the net cage is composed of a net cage frame and a polyethylene net, the polyethylene net wraps the periphery and the bottom face of the net cage frame, mesh specification is 28-32 meshes per square centimeter, the middle of the net cage is separated by a partition net, the height of the partition net is three fifths of that of the net cage, the partition net is made of a polyethylene net with 28-32 meshes per square centimeter, the daylight lamp is arranged at one end of the net cage frame, and the net cage is bound and supported by a fixing rod. When offspring seed is screened and separated, the net cage is arranged in a river in an erecting mode, one side, provided with the daylight lamp, of the net cage is arranged on the upper stream, the upper edge of the net cage is 15 centimeters higher than a water body, the partition net is arranged on a position more than 35 centimeters under a water level, a water layer of more than 35 centimeters is arranged above the partition net, the juvenile crabs are poured into one side, without the daylight lamp, of the net cage, the juvenile crabs with good vigor enter one side, with the daylight lamp, of the net cage from the water body above the net cage, the juvenile crabs with poor vigor stay in the other side of the net cage, and therefore the Chinese mitten juvenile crabs can be screened and separated fast.

Description

technical field [0001] The invention relates to a method for rapid screening and separation of Chinese mitten crab seedlings. Background technique [0002] Chinese mitten crab, also known as river crab and hairy crab, is one of the leading species of aquaculture in my country. The Yangtze River Estuary is the largest natural spawning ground for Chinese mitten crabs in my country. At the end of the 20th century, natural crab seedlings were sold for 80,000 yuan / catties, known as "soft gold in water". Because of its excellent germplasm, the crab seedlings produced in the spawning ground of the Yangtze River Estuary play an irreplaceable and important role in my country's Chinese mitten crab industry, supporting the rapid development of my country's Chinese mitten crab aquaculture industry. The flood season for crab seedlings in the waters of the Yangtze River Estuary is generally at the end of May of the lunar calendar every year. When the tide is high, the crab seedlings go u...

AI Technical Summary

Problems solved by technology

This conventional method for identifying the quality of Chinese mitten crab seedlings is mainly to distinguish high-quality seedlings from inferior seedlings through continuous observation and judgment of the seedlings. It is difficult to quickly screen and separate each batch of crab seedlings in batches.

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