MySheen

Breeding techniques of parent fish in silverfish culture

Published: 2024-11-06 Author: mysheen
Last Updated: 2024/11/06, 1. The source of parent fish. Sexually mature individuals caught in the breeding season can be used for artificial reproduction; sexually mature individuals can be used for artificial reproduction; individuals that are not sexually mature shall not be used for artificial reproduction. two。 The fishing of parent fish. The fishing of large silverfish should be carried out during the peak spawning period. fishing can be started in the north of the Yellow River in early December and in the south of the Yellow River from mid-December. Fishing gear can be Gill net (mesh 2a is 1.5-2.4 cm) or ice

1. The source of parent fish.

Sexually mature individuals caught in the breeding season can be used for artificial reproduction; sexually mature individuals can be used for artificial reproduction; individuals that are not sexually mature shall not be used for artificial reproduction.

two。 The fishing of parent fish.

The fishing of large silverfish should be carried out during the peak spawning period. fishing can be started in the north of the Yellow River in early December and in the south of the Yellow River from mid-December. Fishing gear can be used Gill net (mesh 2a is 1.5-2.4 cm) or under-ice pull net. Parent fish should be caught in the spawning ground where spawning and reproduction are concentrated, and when taking fish on the Gill net, they should be picked gently from the head.

3. The cultivation of parent fish.

Individuals caught during the period of intensive fishing of large silverfish with strong physique and immature gonads may carry out parent fish storage, and shall comply with the following provisions:

(1) parent fish can be stored in cages or ponds.

(2) the specifications of parent fish storage cages can be 5 m × 5 m x 2 m, or 4 m x 4 m x 1.5 m, mesh 2a is 0.5 cm, and the area of parent fish culture pond can be 0.2-0.4 ha with a water depth of 1.5 m.

(3) the storage density of cages should not exceed 4000 m / m3 and that of ponds should not exceed 0.5kg / m3.

(4) during the storage time, a sufficient amount of small fish and shrimp should be put in for the consumption of parent fish, and the management of storage should be strengthened.

4. The choice of parent fish.

The sign of female maturity: a general healthy, large abdomen, small anal fin, triangular shape, egg flow in the abdomen after lifting the fish body, soft hand touch abdomen, egg outflow from the abdomen under light pressure, oval, bright and scattered. The sign of maturity of the male parent fish: the individual is smaller than the female parent fish, the abdomen is not dilated, the mature male chest is rose-red, the anal fin is wavy, the scales above the anal fin are large and adsorptive, and there is a crescent-shaped and milky testis on the left side of the body cavity above the cloaca.

 
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