人工养蟹捕捞方法

每到秋季便是一年一度的河蟹收获季节。为此,要抓紧捕蟹季节,不失时机把蟹捕上来。捕蟹应掌握在“霜降”前后15天内,错过生殖洄游季节再捕就很困难了,因此,有“蟹立冬,影无踪”的农谚。河蟹在立冬前,能逃的设法逃走,逃不了的则在池内打洞隐居。

盘锦人工养蟹效益显著

盘锦人工养蟹效益显著近年来，盘锦人在市场经济的感召下，开发出农民致富的新路子－－人工养蟹。人工养殖河蟹由开始的每亩收入几千元到１９９３年每亩收入几万元，创造了显著的经济效益，有力地促进了这项新技术的普及与推广。盘锦市地处辽河三角洲，过去十年九涝，盐碱...

鳖病的系统预防措施

我国的人工养鳖发展迅速。但鳖在人工养殖条件下,由于生态环境的改变和高密度集约化养殖,病害日趋严重,值得高度重视,防患于未然。日本的人工养鳖业曾因腮腺炎病的流行蒙受巨大损失,致使鳖养殖业一度衰落。湖南省水产所采用温棚养殖试验,每平方米放养稚鳖6只,在正常饲养条件下,养殖一年,鳖死亡率高达28%。许多事实证明,鳖病预防的好坏成为人工养鳖成败的关键之一。

蟹池水草常见病害的防治

蟹池水草生长的好坏直接关系到河蟹养殖的成败，正如渔言所说“蟹大小，看水草”。人工养蟹由于放养密度较高、大量投饵及管理不善等多种因素常导致水草生长不良，影响河蟹健康生长。水草疾病发生机制与鱼类疾病的发生机制一样，大多由环境不良、营养供需不平衡及生物性破坏引起，

A Comparative Study of Genetic Variation between Chinese Mitten Crab Eriocheir Sinensis and Hepu Mitten Crab E.Hepuensis

Horizontal starch gel electrophoresis was used to investigate the biochemical genetic structure of Chinese mitten crab Eriocheir sinensis and Hepu mitten crab E.hepuensis. Sixteen putative enzyme-coding loci were examined for forty-nine Chinese mitten crabs and thirty-eight Hepu mitten crabs. Nine loci, AAT-1 *, AAT-2 *, G3PDH *, GPI *, IDHP-1 *, IDHP-2 *, MDH-1 *, MDH-2 * and PGM *, are polymorphic in Chinese mitten crab, and seven, AAT-1 *, AAT-2 *, GPI *, IDHP-1 *, MDH-1 *, MDH-2 * and PGM *, are polymorphic in Hepu mitten crab. The proportion of polymorphic loci and the expected heterozygosity are 0.562 5 and 0.080 3 for Chinese mitten crab, and 0.437 5 and 0.075 4 for Hepu mitten crab. The Nei’s genetic distance between two species is 0.002 4.