春季水产购种指南(2015版)

来源 :黑龙江水产 | 被引量 : 0次 | 上传用户:yizaiyouzhe
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
经过两年的养殖调整,2014年海淡水主要养殖品种行情在上市高峰期时仍不乐观,多数品种徘徊在盈亏点。同时,中央推行"八项规定"和"六项禁令",除少数人的收入发生变化外,更重要的是影响了养殖户的口袋:苏北地区养殖户仍未摆脱鲫鱼病害的劫难,大丰地区发病率可达六成,整体市场以亏本的居多;安徽地区大草鱼自年中开始一路走低,全年来看养殖户挣扎在保本的边缘线,
其他文献
Based on the Navier-Stokes equation, an average wave energy equation and a generalized wave action conservation equation are presented in this paper. The turbul
A numerical model for shallow water flow has been developed based on the unsteady Reynolds-averaged NavierStokes equations with the hydrodynamic pressure instea
<正> 国务院决定中国人民银行专门行使中央银行的职能,并且成立中国工商银行,承担原来由人民银行办理的工商信贷和储蓄业务。这个决定是正确的。建国三十多年来的经验证明,当
The history and current status of research and development of wave energy in the world is briefly introduced. The main problems existing in these studies are po
In this paper, the neural network technology is combined with the fuzzy set theory to model the wave-induced ship motions in irregular seas. This combination ma
<正> 党的十一届三中全会以来,我市新办集体所有制商业企业取得了建国以来最大一次发展,在活跃市场、方便群众、扩大就业等方面发挥了重要作用,也成为了我市货币回笼中一个重
长岭湖位于哈尔滨市西郊,是自然形成于上世纪五十年代的中型湖泊,历史上水丰鱼肥、风光秀丽,曾经是哈尔滨市重要的食用鱼生产基地与旅游度假区。2004年因地表水补给断流、地
In this paper the range of validity and comparison of accuracy of three Boussinesq-type models (Madsen and Sφrensen, 1992; Nwogu, 1993; Wei et al., 1995; refer
The deformation of sea coast or sandy deposits caused by earthquakes can lead to catastrophic damages to various port structures. The volumetric deformation is
细鳞斜颌鲴(Xenocypris microlepis Bleeker),地方名板黄,属鲤科、鯝亚科、鲴属,其肉质细腻白嫩,风味鲜美独特,历史上就是深受消费者喜爱的名优品种。由于自然资源锐减,市场上