A kind of breeding method of low-salt-tolerant Apostichopus japonicus seed

Abstract

The invention provides a method for breeding seedlings of low-salt tolerance sea cucumber, which is characterized in that: before the seawater temperature is 12°C in late March, select sea cucumbers that have been cultured for more than 1.5 years and have an individual weight of more than 250 g / head from the estuary-type low-salt sea area. The local sea cucumbers were isolated and temporarily raised in ponds as the basic population for breeding. When the salinity was 20±1.5 and the temperature was 16°C during the flood season in May, those still eating and growing normally were selected as seed ginseng and artificially grown in a salinity environment of 20±1.5. Breeding to obtain F1 progeny seedlings, and the mature F1 progeny individuals after 2 years of cultivation are then selfed and hybridized with the selected basic population to obtain F2 progeny. Under high temperature conditions, with this cycle, after 3 to 4 generations of selective breeding, low-salt-tolerant sea cucumbers with stable genetic traits and low salinity can be obtained, which can expand the range of suitable cultivation, increase yield and product quality, reduce production risks and Improve the economic benefits of fishermen.

Description

technical field [0001] The invention relates to seawater culture technology, in particular to a breeding method for low-salt-tolerant sea cucumber seedlings. Background technique [0002] Apostichopus japonicus is a kind of narrow-saline animal, and the suitable growth salinity range is 26-35. In my country, it is mainly distributed in the yellow sea and Bohai sea with suitable salinity in Liaoning, Shandong and Hebei. In order to further expand the sea cucumber breeding space, expand the breeding scale, and increase production to meet the growing consumer demand, Shandong Province has taken the lead in conducting breeding experiments in the low-salt sea area of ​​the Yellow River Delta where there is no natural distribution of sea cucumbers since 2003. In 2005, it was successful and proposed The development strategy of "East ginseng and West cultivation" has been adopted. At present, the area of ​​pond culture has been developed to about 337,000 mu, accounting for 69.5% of ...

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Problems solved by technology

In addition, the current risk of sea cucumber farming in low-salt sea areas is much higher than that in suitable sea areas. For example, in the summer of 2013, my country experienced abnormal climate with concentrated heavy rainfall and continuous high temperature, which caused damage to sea cucumber farming in low-salt sea areas such as the Yellow River Delta. The rate of damage is over 80%, while the rate of damage in suitable sea areas is about 20%.

In recent years, Chinese scientific and technological personnel have successively carried out the cultivation of low-salt-tolerant Apostichopus japonicus seedlings, and initially obtained seedlings that can grow at a salinity of 19-20°C. Due to the disadvantages of decreasing domestication and breeding, the low-salt tolerance of seedlings is extremely unstable, and it has not yet been popularized and applied in actual production.

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