日本牙鲆人工苗种体色异常的研究现状

PRESENT STATUS OP RESEARCHES ON THE ABNORMAL SKIN COLOR OF ARTIFICIALLY REARED LEFT-EYED FLOUNDER(PARALICHTHY OLIVACEUS)FRY IN JAPAN

摘要: 近年来,日本的牙鮃苗种生产技木不断提高,生产量逐年增多。1984年全国生产牙鮃苗种总计约1375万尾,其中放流用苗种848万尾,养殖用苗种527万尾。牙鮃放流增殖在全国的三十三个县展开,牙鲜养殖继鰤鱼、真鲷而成为第三大鱼类养殖业。但是,在人工苗种生产过程中,有眼侧体色异常(呈白色,以下简称白化)个体的发生率很高。

Abstract: Few empirical formulas have been proposed by means of mathematical inductionmethod, in accordance with the data from the weight and the center of gravity of about30 small fishing boats. These formulas can be used as ready reference for calculating displacement in apreliminary design.