论文部分内容阅读
我国发展淡水珍珠养殖产业的历史虽仅20余年,但珍珠的产量和出口量均已跃居世界首位。由于产品质量长期停滞不前,珍珠出口换汇率在逐年下降。面对今日国际珠宝市场以质竞争的严峻形势,本讲座以提高养殖珍珠品位为导向,从幼蚌繁殖、手术作业、培育技术和珠蚌病害防治等方面,提出一些新技术和新方法供参考。第一讲三角帆蚌人繁技术及其幼蚌的促长培育一、三角帆蚌人工繁殖技术 (一)三角帆蚌人繁生物学知识 1、性别特征双壳类软体动物在生殖季节,可见内脏团二侧周围具有丰满发达的生殖腺。生殖腺呈黄色者,多为雌性个体;呈乳白色者则多为雄性个体。然而三角帆蚌的生殖腺外表
Although the history of the development of freshwater pearl farming industry in our country is only over 20 years, the output and export volume of pearl all rank the first place in the world. As the long-term product quality stagnated, pearl export exchange rate declined year by year. Faced with the grim situation of competition in the quality of the international jewelery market today, this seminar aims at improving the quality of cultured pearls. Some new techniques and new methods are proposed for the breeding of young mussels, surgical operations, cultivation techniques and prevention and cure of mussel disease. . Lecture on Artificial propagation of Hyriopsis cumingii and the growth and development of its young mussel I. Artificial propagation of Hyriopsis cumingii (I) Artificial knowledge of Hyriopsis cumingii A. Sexual characteristics Bivalve molluscs in the reproductive season can be seen Visceral groups around the two sides with a well-developed gonads. Gonads are yellow, mostly female individuals; milky white are mostly male individuals. However, the angle of the gonads of Hyriopsis cumingii