Spiritual Koi Varieties and Fry-Rearing Techniques
1. Specifications of the fry-rearing pond The cement pond area is 1620 m, with a pond depth of 6580 cm; the pond area is 6001500 m, with a pond depth of 150200 cm and an initial water depth of 60 cm. As the fry grow, new water is gradually added until the depth reaches 120 cm. 2. Stocking density During fry rearing, according to fish growth,...
2. Stocking density
During fry rearing, according to fish growth, appropriate adjustments and thinning are carried out at each selection. The specific relationship between stocking size and density is shown in Table 1.
⟧ 3. Feeding
Feed suitable palatable artificial compound feed.
4. Graded rearing of fry
They are reared in grades to reduce the load on the production water surface.
5. Daily management
During fry rearing, persist in patrolling the pond 5 times day and night every day: early morning, morning, late morning, afternoon, and night.
6. Fry selection
The fry-rearing process is also a process of selecting the superior and eliminating the inferior. In addition to routine management such as regular water changes, feeding, and patrolling, fry selection is usually carried out.
(1) First selection of fry
The first selection is carried out when the fry grow to 3—5 cm.
(2) Second selection
The second selection is carried out when the fry grow to 8—10 cm.