Method for increasing ovulation rate of sinonovacula constricta (Lamarck) parent oysters and guaranteeing ovulation synchronism

Abstract

The invention provides a method for increasing the ovulation rate of sinonovacula constricta (Lamarck) parent oysters and guaranteeing ovulation synchronism. An inonovacula constricta (Lamarck) parent oyster ovulation device employed comprises a rectangular bottom frame, supporting rods, a shielding film and a light-dimming window, wherein small holes are drilled in the four corners of the bottom frame, the four supporting rods are inserted into the small holes to form a cuboid-shaped frame, the shading film as high as the supporting rods is put to surround the cuboid-shaped frame, and the light-dimming window is paved at the top of the cuboid-shaped frame; the bottom of the bottom frame is covered with a nylon net; an air inlet pipe is laid in the longitudinal direction of the bottom frame; three air stones are connected under the air inlet pipe. When the inonovacula constricta (Lamarck) parent oyster ovulation device is applied for ovulation, the light intensity in the light-dimming window is controlled at 200Lx, and therefore, the ovulation synchronism of the inonovacula constricta (Lamarck) is guaranteed, and meanwhile, the ovulation rate of the sinonovacula constricta (Lamarck) parent oysters is greatly increased and the shortcomings of the prior art are solved; meanwhile, the whole device is very convenient to assemble and disassemble, easy to clean and low in cost, and cannot be corroded by seawater; the method can be popularized in actual production very easily.

Description

technical field [0001] The invention belongs to the technical field of mariculture, and relates to a method for raising seedlings of razor clam, in particular to an ovulation device and method for brooding of clam clam; in the process of raising seedlings of razor clam, by controlling the light intensity in the ovulation device, it is possible to control the brooding of clam clam Ovulation rate and the purpose of ensuring ovulation synchronization. Background technique [0002] Sinonovacula constrzcta (Lamarck) is a mollusk belonging to Bivalvia, Lamarckes, Lamarckidae, and the genus Construcled. It is widely distributed in the tidal flats where rivers and seas meet in East Asia. Hanged clams are one of the four largest artificially cultured shellfish in China, with an annual output of 700,000 tons, second only to oysters, clams and scallops. Now the artificial seedling raising technology of razor clams is basically mature, and more than 90% of the seedlings needed for arti...

AI Technical Summary

Problems solved by technology

[0004] Since the seedlings of razor clams are raised in autumn, and the seedlings of shrimps and crabs are raised in spring, most of the breeding farms of razor clam seedlings are workshops that use shrimp and crab seedlings. These workshops are often covered with glass steel tile roofs or plastic film roofs, so the light transmittance is very high. It is often difficult to obtain the ideal ovulation rate by using these workshops for induction of razor clams

However, it is necessary to carry out shading reconstruction on the ceiling, and to restore the original ceiling when raising shrimp and crab seedlings in the coming year, which will inevitably double the production cost of the enterprise.

However, if the razor clam is placed in a completely dark environment for temporary breeding, it is found in actual production that many times the razor clam will ovulate during the day. Due to insufficient holding time, the ovulation rate is not ideal. the difficulty of production management

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