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This study was carried out to compare the effects of two egg de-adhesion methods including use of tannic acid and clay suspension on reproductive parameters of beluga. For this purpose, one treatment with eggs treated with tannic acid and one control group with eggs treated with clay with 4 replications was performed. According to results, the duration of adhesion removal procedure was 45 min for eggs treated with clay while this dura- tion was 1:30 min for eggs treated with tannic acid. Also, the fertilization percent, hatching percent and survival percent of alevins were higher for eggs treated with tannic acid compared to eggs treated with clay suspen- sion. Furthermore, the fungal pollution rate was higher for eggs treated with clay suspension than tannic acid treatment. Results of the research indicate egg de-adhesion by tannic acid as more efficient than clay suspen- sion in terms of time saving and reproductive success of beluga. [ABSTRACT FROM AUTHOR]