3 results about "Larvacea" patented technology

The present application belongs to the technical field of aquaculture, and particularly relates to a method for improving survival rate of Dendostrea folium shell top larvae by dry exposure treatment. In the present application, the Dendostrea folium larvae in the late shell top stage are subjected to dry exposure stress treatment, and then rehydrated, fed and cultivated. Compared with the control group of oyster larvae without dry exposure stress treatment, the survival rate of the larvae cultivated by the shell top larvae subjected to dry exposure stress treatment is significantly improved under high temperature, low temperature and low oxygen stress. The present application can significantly improve the environmental stress resistance of Dendostrea folium larvae, and has a good application prospect in shellfish seed production.

The present application relates to a breeding method of hybrid seed of Babylonia formosae and Babylonia areolata. The breeding method comprises the following steps: breeding Babylonia formosae parent snails and Babylonia areolata parent snails in the dark, feeding 3-5% of the body weight of Babylonia formosae with vegetables, and feeding 10-15% of the body weight of Babylonia formosae with mixed biological bait, continuously feeding until the gonad matures, and feeding at least once a day; obtaining egg sac clusters by hybridizing Babylonia formosae parent snails and Babylonia areolata parent snails; hatching the egg sac clusters to form planktonic larvae, cultivating the planktonic larvae for 15-20 days, and metamorphosing the planktonic larvae into juvenile snails to obtain hybrid seed. The hybrid seed obtained by the breeding method has excellent metamorphosis rate, fertilization rate and hatching rate, and the average body weight, average shell length and survival rate are also significantly improved.

This invention discloses a seawater treatment system for aquatic organism seedling and larval cultivation based on a natural ecological cycle. The system includes a natural sedimentation tank, a secondary sedimentation algae cultivation tank, a multi-stage dark sedimentation tank, a primary sand filter, a secondary sand filter, and a water storage tank connected to the end of the secondary sand filter. A pump is installed to connect to a water storage tower. A seawater concentration device and an ultrafiltration device are also included between the water storage tower and the aquatic organism seedling tank. The secondary sedimentation algae cultivation tank can be directly connected to a juvenile shellfish rearing tank for direct use in juvenile shellfish cultivation. The sand filter also features a backwashing design for easy recycling. The seawater processed through the primary and secondary sand filters, concentration device, and ultrafiltration device can be used for larval cultivation of aquatic organisms. This water treatment system, through its multi-stage structural design and combined with natural environmental control of light and shading, avoids the drawbacks of chemical and biological purification and the shortcomings of simple physical sand filtration in a natural and ecological way. This ensures a large-scale supply of water for aquatic organism seedling and shellfish cultivation, meeting the diverse needs of large industrial areas.