FIELD: fishing and fish farming.
SUBSTANCE: method involves placing fish producers in a pool with river water, in which the salinity is gradually increased by adding table salt with a concentration gradient of 1–2 ‰ a day to concentration of 5–8 ‰. Producers are maintained in this medium until puberty, then salinity is smoothly increased to 9–12 ‰ with the same salinity concentration gradient. Manufacturers are held in this medium for 1–2 days, after which they are transferred to spawning conditions by desalination of the medium with concentration gradient of 2.5–3 ‰ per hour and produce offspring.
EFFECT: method provides higher survival rate and fish growth rate.
1 cl, 2 dwg
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