Method for comprehensively regulating and controlling verasper moseri gonad maturity and ovulation by using temperature, illumination and nutrition

Abstract

The invention discloses a method for comprehensively regulating and controlling verasper moseri gonad maturity and ovulation by using temperature, illumination and nutrition. The method comprises the following steps: regulating and controlling synchronous development of parent fish gonads by using temperature and illumination in 2 to 3 mouths before a breeding season begins; adding additives such as lecithin and the like into baits to promote nutrition absorption of parent fish when the parent fish gonad development is started; and increasing fed clam worms every day to promote final maturity and quality promotion of oocytes after the parent fish gonads are developed to a III period. The ovulating parent fish rate under the regulation and control of the method is up to 85 percent, and the spawning effect is good. The method can be used for scale production of offspring seeds; and by using the method, mass good-quality germ cells can be obtained, and smooth operation of offspring seed breeding can be ensured.

Description

Technical field: [0001] The invention belongs to the reproduction control and oviposition technology of spotted star flounder, and relates to a method for artificially controlling light and water temperature, and utilizing nutritional strengthening measures to promote maturation and ovulation of gonads of the spotted star flounder broodstock. Background technique: [0002] Striped star flounder (Verasper moseri) is a large cold-water benthic flounder, mainly distributed in the Pacific coast north of Ibaraki Prefecture and the Sea of ​​Japan coast north of Wakasa Bay, Japan. my country's Yellow Sea and Bohai Sea were also distributed in the past, and now there has been no catch for many years. Under suitable breeding conditions, after one year of cultivation, the body weight of spotted flounder can reach more than 900 grams per tail, with fast growth, low temperature resistance, strong stress resistance, high survival rate, high feed conversion rate, and low breeding cost It ...

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Problems solved by technology

Natural spawning of star flounder can be obtained by water temperature stimulation method (Institute of Oceanology, Chinese Academy of Sciences, Xiao Zhizhong, etc., 2007), but there are few broodstocks that naturally spawn, short spawning period, and complicated spawning conditions to obtain fertilized eggs Problems such as the small number of fertilized eggs and the difficulty in collecting fertilized eggs have not yet been popularized and applied in the process of large-scale seed production; fertilized eggs can also be obtained by using hormone induction methods, but the technology of obtaining high-quality fertilized eggs purely using hormone induction is unstable. There is a problem that broodstock gonads have different response times to hormones, and the fertilization rate and hatching rate of eggs vary greatly among batches, which cannot meet the production needs of batch seedlings

Usually under the condition of artificial temperature and light regulation, broodstock gonads mature and ovulate, but oocytes often fail to reach final maturity due to lack of nutrients, or the quality is low, which affects the acquisition of high-quality fertilized eggs

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