A method for directly cultivating large-scale fish fingerlings in ordinary ponds with open-mouthed peltridge fish

Abstract

The invention relates to a method for directly breeding first fed yellow-head catfish into large size fish in an ordinary pond. The method comprises preparing the infrastructure, preparing a water source, performing preparation before breeding and performing fingerling seeding. The method of the fingerling seeding comprises step 1, breeding time control which includes that yellow-head catfish fingerlings are thrown when the plant height of plants planted in the pond is 40 to 50 cm; step 2, breeding amount control which includes that the breeding amount of every mu is determined according to the breeding specification and the expected yield; step 3, water level control which includes that the early water level is 20 cm, the water level is increased by 5 to 10 cm every day along with the gradual increase of the growth of the fish, and the water depth reaches about 100 cm when the fingerlings grow to be about 5 cm; step 4, feed feeding; step 5, disease control which includes that the fingerlings are soaked in 10 ppm of formalin liquid for 3 to 5 min in the later period of the breeding. According to the method for directly breeding the first fed yellow-head catfish into the large size fish in the ordinary pond, pathogenic organisms spread due to fed food organisms are blocked; the first fed fingerlings are thrown into the pond directly and accordingly the adaptation to the environment of the fish is improved; excess nutrients in the pond are absorbed by the planted plants in quantity and accordingly the shelter and habitat is provided for the fingerlings; the probability of the injury and death caused by fishing and transportation is reduced.

Description

Technical field [0001] The invention relates to a method for directly cultivating large-size fingerlings of yellow catfish open fry in ordinary ponds, and belongs to the technical field of fish fry and fingerling cultivation. Background technique [0002] Existing techniques for breeding Pelteobagrus fulvidraco fry are usually called "two-step breeding method": [0003] The first step: Cultivate the hatched fry to about 1.5 ~ 2.5 cm. [0004] During this period, the early stage of Pelteobagrus fulvidraco fry is the endogenous trophic stage, relying on its own egg yolk to provide nutrition. When the yolk is almost absorbed, the mouth will eat algae and small animals on the cement pool wall, and enter the mixed nutrition stage. After the yolk is completely absorbed, only Rely on the intake of external food to provide nutrition and enter the exogenous nutrition period. The biological sources of bait at this stage are mainly plankton fished from ponds. [0005] The second step: transfer...

AI Technical Summary

Problems solved by technology

[0008] 1. During the first step of cultivation, it is necessary to equip a pond to cultivate bait organisms and occupy the pond;

[0009] 2. The bait organisms fished from the bait organism cultivation pond contain a large amount of debris that is not easy to separate and remove, and may also carry pathogenic organisms, resulting in disease occurrence;

[0010] 3. When fish fry cultivated in cement ponds are transferred to ponds for cultivation, they have poor adaptability to the environment, and injuries caused by fishing and transportation during transfer can easily cause fish fingerlings to die;

[0011] 4. The fish fry gather at one (several) places on the edge of the pond because they do not have a good habitat, and are vulnerable to predators;

[0012] Because of the above reasons, the mortality rate of seedlings is high, and the survival rate of cultivation is extremely unstable. The survival rate varies between 10% and 80%, and the average survival rate is about 30%.