Cultivation method for thin-shell fragile juvenile molluscs in benthic mussels

Abstract

The invention discloses a cultivation method for thin-shell fragile juvenile molluscs in benthic mussels. The cultivation method comprises the following steps of: making a frame which is 4.0-9.0m long, 2.0-4.0m wide and 0.2-0.3m high by polyethylene plastic, specifically, designing the specifications of the frame according to the size and shape of a nursery pond, surrounding the bottom and periphery of the frame by a polyethylene sieve screen with hole diameters of 0.3-10mm to form a mesh box, the hole diameters of the polyethylene sieve screen being less than the sizes of the juvenile molluscs, and 30-32 polyethylene ropes being used at the four corners of the upper portion of the frame respectively and capable of lifting the mesh box; then placing the mesh box at the bottom of the nursery pond, paving fine sand or mud with a particle size of 5-10mm according to the different requirements of different benthic mussels on a substrate, placing the settled and metamorphosed juvenile molluscs in the mesh box, and carrying out juvenile mollusc cultivation. During pond transfer, the benthic juvenile molluscs are lifted by the polyethylene ropes and capable of floating with the mesh box, and the fine sand or mud is reserved at the bottom of the pond to be removed; the thin-shell fragile juvenile molluscs in the benthic mussels are the juvenile molluscs of atrina pectinata, sinonovacula constricta, solen grandis and atlantic jackknife clam. The cultivation method disclosed by the invention overcomes lots of damages and breakages on the juvenile molluscs due to pond washing and transfer.

Description

technical field [0001] The invention relates to an indoor intermediate cultivation method for buried shellfish spat, in particular to a cultivation method for buried shellfish with thin and fragile shells. Background technique [0002] The intermediate breeding technology of buried shellfish spat is the key and foundation for the success of buried shellfish nursery. Only when large-scale seedlings are cultivated in the middle, can the spat be used for breeding and multiplication by breeding units. In the past, the intermediate cultivation of buried shellfish spat was carried out by spreading sand and mud on the bottom of the pond. Because the buried shellfish spat and intermediate cultivation tended to secrete mucus, the feces and dead individuals with residual bait would stick together, resulting in the bottom of the pond. Pollution of juvenile shellfish, especially burial shellfish with thin and fragile shells, such as clams, razor clams, and razor clams, is easy to be dam...

AI Technical Summary

Problems solved by technology

In the past, the intermediate cultivation of buried shellfish spat was carried out by spreading sand and mud on the bottom of the pond. Because the buried shellfish spat and intermediate cultivation tended to secrete mucus, the feces and dead individuals with residual bait would stick together, resulting in the bottom of the pond. Pollution of juvenile shellfish, especially burial shellfish with thin and fragile shells, such as clams, razor clams, and razor clams, is easy to be damaged and the shells are broken when moving to the pond, causing a large number of deaths. The technical bottleneck of shellfish cultivation; coupled with the inconvenience of management during the intermediate cultivation of spat, the survival rate of spat intermediate cultivation is low, the growth is slow, the emergence of seedlings per unit of water is low, and the benefit is poor

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