High-density abundant-capacity cultivation method for large-size odontobutis obscura fry

Abstract

The invention relates to a high-density abundant-capacity cultivation method for large-size odontobutis obscura fry. The method comprises the following steps: (1) preparing capacity-abundance measures before odontobutis obscura fry cultivation, including facility capacity abundance, water body capacity abundance, bait capacity abundance and the like; (2) putting a proper amount of odontobutis obscura newly hatched larvae according to the volume of a culture water body in a culture facility, the total area for the inhabiting of odontobutis obscura larvae after capacity enlargement and the like; (3) according to different growth periods of odontobutis obscura fry, feeding different types and proportions of bait biological varieties, and performing scientific cultivation management; (4) after the odontobutis obscura fry come out of the membrane, keeping the breeding quantity of the fry per cubic meter of water body to be more than 9000 after 30 + / -5 days of breeding; carrying out odontobutis obscura classification screening with the head width as the standard, wherein the head width of 70% or above of the fry is larger than 3 mm, the overall length is larger than 15 mm, the large-specification fry standard of odontobutis obscura is achieved, and high-density breeding of the large-specification fry of odontobutis obscura is achieved.

Description

technical field [0001] The invention relates to a high-density enrichment cultivation method for large-scale seedlings of sandfish, which belongs to a method for cultivating aquatic animal seedlings. Background technique [0002] Sand pond snakehead (Odontobutis potamophila) belongs to Perciformes and Potamophilaidae, also known as Pu fish, Tubu fish, tiger head shark, etc. It is widely distributed in the middle and lower reaches of the Yangtze River, Qiantang River, Minjiang River and other water systems in my country. It is a small freshwater fish. bottom fish. Its meat is delicious, tender and delicious, sweet and warm, can nourish the stomach, nourish qi, strengthen the spleen, nourish blood, etc. It is a high-quality edible fish and belongs to the top grade of fish. With the improvement of people's living standards in our country, the market demand for sand snakeheads is increasing year by year, and South Korea and other Southeast Asian countries have an increasing dema...

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Problems solved by technology

[0003] With the continuous expansion of the breeding area of ​​sandfish, the Tangkou experiment of Jiangsu Freshwater Fisheries Research Institute found that large-scale seedlings of sandfish (full length of the seed ≥ 15mm) can be directly put into the pond, and the survival rate can reach more than 90%, which can effectively Solve the large difference in the survival rate of sand snakehead seedlings caused by the different breeding levels of farmers, and the unstable output. However, the shortage of large-scale sand snakehead seed supply is becoming more and more serious, which seriously affects the stability of sand snakehead breeding industry. develop

[0004] Breeding experience shows that in the process of cultivating Channa mongolia seedlings, the growth rate of the seedlings is quite different, and under high-density cultivation conditions, the phenomenon of big fish eating small fish occurs frequently, resulting in a low survival rate of Channa mongolia seedlings; Density > 3500 tails / m 3 At that time, after about 30 days of cultivation, the large-scale seedlings of sand pond snakehead only accounted for about 30% of the total number of seedlings bred, and the cultivation effect was not significant

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