METHOD FOR INCUBATING FERTILIZED CAVIAR AND RAISING YOUNG FISH AT PISCICULTURAL FARMS WITH RECIRCULATION WATER SUPPLY Russian patent published in 2004 - IPC

FIELD: pisciculture, fish-raising. SUBSTANCE: incubation of fertilized caviar and further keeping free embryos till the stage of larvae one should perform in recirculation water treated with magnetic field and red light; fertilized caviar and free embryos should be irradiated with blue light, and fodder for larvae and young fish should be prewetted in magnetized water. Treatment of recirculation water with magnetic field should be conducted at magnetic induction of 80- 100 mTl and the rate of recirculation water flow of 0.5-1.5 m/sec during day time twice or thrice weekly. Irradiation of recirculation water with red light is carried out within 650- 680 nm wave length at irradiation power being 0.05-0.15 W/sq. cm. During evening period daily during the whole period of fertilized caviar incubation and young fish raising. Irradiation of fertilized caviar and free embryos with blue light should be conducted within 430-460 nm wave length at irradiation power being 0.10-0.20 W/sq. cm. for 15-20 min during morning hours daily till the stage of larvae. Prewetting in magnetized water is carried out for 30-40 min immediately after treating the water with magnetic field at magnetic induction being 80-100 mTl and the rate of water flow being 0.5-1.5 m/sec. The present innovation enables to decrease the wastes of fertilized caviar during incubation period, increase survival rate in larvae during metamorphosis and increase fish viability. EFFECT: higher efficiency of incubation. 1 ex