Odontobutis obscura fry grading cultivation method

Abstract

The invention relates to an odontobutis obscura fry grading cultivation method, which is characterized by comprising the following steps of: firstly, carrying out first-time screening on seedlings after emergence in an indoor nursery pond in late April every year, secondly, carrying out second-time screening between 10 to 15 days of first-time fry putting in early May every year, and thirdly, carrying out second-time screening between about 15 days of second-time screening in mid-late May every year, fourthly, the odontobutis obscura is screened for the fourth time 18-20 days after the third time of screening, the odontobutis obscura is screened through a 4-mesh screen, the specification of the upper portion of the screen is 1.55 / g, and the overall length of the upper portion of the screen is about 3.5 cm; the specification of the lower surface of the screen is 3.3 / g, and the overall length of the odontobutis obscura is about 2.5 cm. By means of regular screening, the odontobutis obscura of different specifications is cultivated in a grading mode, the odontobutis obscura of different specifications is prevented from killing one another, and the survival rate is remarkably improved.

Description

technical field [0001] The invention relates to a seedling raising technology, in particular to a method for increasing the seedling emergence rate of the sandfish seedling, and a hierarchical cultivation method. Background technique [0002] As we all know, Channa is a small bottom-dwelling carnivorous fish. In the process of large-scale cultivation, the number of seedlings per square meter is as high as 2000-3000, and live biological bait such as silk earthworms and red worms are used as food. In the case of insufficient bait, snakeheads will eat big and small. With the extension of breeding time, the size will gradually increase, and it is more likely to eat big and small. Especially in the case of breeding ponds, small sand Channa is more likely to be attacked because there is no place to hide, and the number of ponds will gradually decrease. There is no good solution to this. Contents of the invention [0003] The purpose of the present invention is to invent a kind ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to invent a kind of method for cultivating the seedlings of Snakena argentina by dividing the same cement in time for the problem that large and small ones will affect the harvest rate of seedlings when the irregular specifications are separated when they are cultivated in outdoor cement ponds. The different sizes and specifications of the sand pond carp in the pond are cultivated separately to reduce the occurrence of mutual cannibalism and improve the survival rate