挪威渔业技术研究所的专家研制成功一种能鉴别青鱼雌雄的仪器。该仪器的主要结构为电子器件部分和分类机械部分。使用时,只要用仪器向鱼体照射不同光谱的 X 线,根据其透射度差值就可分辨出青鱼的雌雄,并将它们分类。由于雌性青鱼要比雌雄混合青鱼的售价高得多,所以这种仪器对渔业生产和销售部门很有用。 Norwegian Fisheries Institute of Technology experts developed a successful identification of herds male and female instruments. The main structure of the instrument for the electronic part and the classification of mechanical parts. Use, as long as the instrument to the fish irradiated with different spectral X-ray, according to the difference between its transmission can distinguish the heron male and female, and they are classified. Since female black herds are sold at much higher prices than mixed herds, this instrument is useful for fisheries production and marketing.