渔业

Here, we took demonstration study of the ecological impacts of disconnection from the river on fish recources in Zhangdu Lake. Our results showed that:(1) Fishery mode changed and the rate of wild fishery production changed from 95% in 1949 to less than 5% in 2002.(2) Fish species have decreased from 80 in 1950s to 52 at present, and the rate of migrant and potamic species decreased from 50% in 1950s to 30% at present.(3) Comparing with the linking lake, Zhangdu Lake had higher fishing production, larger individual size, fewer species number and lower diversity index of "mihunzheng" fishery, a universal fishing tool in Yangtze.

我们以涨渡湖为例开展江湖阻隔后对单个湖泊鱼类资源所产生的生态影响进行研究，结果表明：江湖阻隔导致湖泊生产经营方式改变，使得野生渔业产量的比例由1949年的95%，降低到2002年的不足5%；江湖阻隔后湖泊鱼类种类由50年代约80种下降到现在的52种，其中，洄游性和流水型鱼类比重由50%下降至不足30%；迷魂阵渔获物在单位产量、个体大小上极显著(p 0.01)地高于通江湖泊，但在物种数和多样性指数上则要低得多(p 0.01)。

However, the selenium can relieve the damage to a certain limitation. During the cultivation of Potamogeton maackianus of rich selenium, the situation of heavy metal pollution should be checked in time so as to avoid the damage on fish caused by the heavy metals enriched in the bait.

然而，Se缓解Cd对黄丝草的毒害是有一定限度的，在富Se黄丝草的繁殖过程中，需及时检查重金属污染情况，防止重金属在饵料中的富集，以免造成对渔业的危害。

Based on thedata,this article assessed the stocks of 23 species of 5 commercial taxonomical groups—Trichiuridae were assessed,Decapterus maruadsi,Trachurus japonicus,Nemipterusand Priacanthidae.

1997年12月至1999年6月，利用&北斗&号调查船配置的Simrad EK500回声探测-积分系统在南海北部海域进行了渔业资源声学调查，调查分春(4～6月)、夏(7～9月)、秋(10～12月)、冬(12～2月)4个季节进行。

This report is required under the 2006 Magnuson-Stevens Reauthorization Act provisions dealing with IUU fishing and with protected living marine resources.

该报告是根据2006年《麦格纳森—史蒂文森渔业保育管理法》有关条款要求撰写的。

Rine capture fisheries in China,the conclusionof economic model analysis were discussedinrealistic level .The basic thought forfurther improvement and

陷， 对经济模型分析的结论进行了现实层面的探讨，并提出了进一步完善和创新海洋捕捞渔业经营机制的基本思路。

If the EU continues on this path, orange roughy and many other species may suffer a commercial extinction over the next two years,'' said Carol Phua from the World Wildlife Fund.

普雅说︰「由於深海物种成长率缓慢，面临渔业压力时相当脆弱……假如欧盟执意这样做，纽西兰红鱼与其他物种两年后可能会在市面上绝迹。

This thesis explores the feasibility of using synthetic jet actuators for the propulsion of small underwater vehicles. This work was inspired by the widespread use of pusatile jet propulsion by sea creatures such as squid, salp, and jellyfish. The jets created by these animals utilize vortex rings for thrust production.

由於养殖渔业具有短期供给缺乏弹性、易腐败、不易储存等特性，更因为养殖业的交易性质，大多是在货到当天立即透过价格的调整，将到货量全部结清，所以数量与价格的关系，应该是数量影响价格，故本研究透过逆需求系统求算所有参数。

Considering the importance of Bristol Bay as both a subsistence and commercial fisheries resource, it makes little economic sense to jeopardize the long-term stability of the region by lifting the current ban on leasing, continued Sheard.

对于布里斯托尔海湾而言，以其在生态和渔业资源的重要地位，取消当前的租赁禁令对经济的影响很小，不会危害这个地区的长期稳定，Sheard继续说到。

The value as food and medicine are found in Sipunculus nudus. A lot of actives and the function of anti-tiring, anti-old and increasing immunology are testified in Sipunculus nudus via modern medical researching.

裸体方格星虫具有良好的食用和药用价值，现代医学研究表明其含有多种活性物质，具有抗疲劳、延缓衰老和提高机体免疫力等功能，是具有重要经济价值的海洋渔业资源。

Sooke BC Fishing Sooke BC on Vancouver Island is known for its year-round fishery.

公元前搜救渔民搜救卑诗省温哥华岛是已知其全年渔业。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。