南海黄鲷性腺发育的初步研究   总被引：1，自引：0，他引：1  

施兆鸿  王建钢  高露姣  谢营梁  夏连军 《台湾海峡》2006,25(3):353-359

本文采用常规的生物学调查方法并取黄鲷性腺做石蜡切片，用显微镜观察黄鲷的性腺发育，进行组织学研究．其结果表明，南海黄鲷精巢可分成6期，精巢5期的成熟度指数为1．62％～2．71％，平均值为1．99％．雌性生殖细胞可见5个时相，卵巢发育也相应分成6期，卵巢5期时的成熟度指数为8．90％～13．90％，平均值为9．45％．南海黄鲷的繁殖期在11月至翌年的4月，繁殖高峰在12月至3月，黄鲷的产卵类型属于在同一繁殖季节中多次产卵类型．本文还对黄鲷的雌雄同体现象、繁殖力、繁殖时间进行了讨论．  相似文献   

青岛旅游商品开发的回顾与前瞻     

方百寿 《海岸工程》2002,21(4):66-72

青岛旅游商品开发拥有辉煌历史，曾经领导全国消费潮流。但从旅游经济产业结构来看，青岛旅游商品开发存在如下问题：缺乏品牌和特色商品，小规模开发与经营，品种和质量有待加强，流通渠道不畅，购物环境不理想和商品的旅游后影响力不强等。提出相应开发对策；政府宏观指导，名企参与开发，丰富品种和特色，完善购物环境，使物流渠道畅通，将市场分类分层，利用节庆造势，周边联合连动和形成购物胜地。  相似文献   

薛家岛湾沉积动力学特征及海港开发研究   总被引：3，自引：0，他引：3  

李凡  林宝荣  吴永成  王从敏 《海洋与湖沼》1994,25(4):452-457

于１９９０年秋对胶州湾内的薛家岛湾进行海洋水动力条件及积动力学特征,泥沙运动规律研究,为开发建设港口提供科学依据。结果表明,湾内深大于１ｍ的海底泥沙发生“全面移动”的时间,一年内仅有１－２ｄ,其余处于稳定状态或“表面移动”状态。湾内泥沙来源很少,预计建港后,港池和航道年平均回淤量分别小于１６ｃｍ,１０ｃｍ对于开发中小型港口十分有利。  相似文献   

Life cycle strategies of Northern krill (Meganyctiphanes norvegica) for regulating growth, moult, and reproductive activity in various environments: the case of fjordic populations     

Cuzin-Roudy  J; Tarling  G.A; Stromberg  J.-O 《ICES Journal of Marine Science》2004,61(4):721-737

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围垦的社会经济价值及其对海洋环境影响的评估   总被引：2，自引：0，他引：2  

张健  施青松  黄宝兴 《海洋学研究》2006,24(Z1):20-25

从围垦滩涂与保护湿地的关系着手,针对浙江省的滩涂围垦现状,讨论了沿海滩涂实施围垦工程所创造的社会经济价值,分析了湿地生态的环境特征及其对自然界的贡献,指出并探讨了海岸带资源开发与海岸工程建设所带来的问题,从湿地保护和经济可持续发展的角度提出了相关的建议。  相似文献   

Embryonic and larval development of Babylonia formosae habei (Altena and Gittenberger, 1981) (Gastropoda:Buccinidae) on China''''s coast     

CHEN Yan  KE Caihuan  ZHOU Shiqiang  LI FuxueDepartment of Oceanography  Key Laboratory for Marine Environmental Science of the Ministry of Education  Xiamen University  Xiamen  China 《海洋学报(英文版)》2004,(3)

The development of embryos and larvae of Babylonia formosae habei living along the southeast coast of China is observed under laboratory conditions. The egg masses are laid by females on hard substrate at night and each capsule contains 100-500 eggs. Each egg is 250-280 mm in diameter. The first two cleavages of the embryo are meridional and equal, and a polar lobe is produced. Larval kidney, which only consists of a single cell, appears during the gastrula stage on each side of the embryo. The right tentacle develops prior to the left one. At 25-27℃, an intracapsulate veliger stage is reached about 4.5 d after deposition. The larvae hatch on the fifth day as swimming veligers with a shell length of 360 -500 mm. The newly hatched larva can ingest suspended algal cells from the water column and remains in the pelagic stage for 8-10 d. The newly settled juveniles are 900-1 200 mm in shell length.  相似文献   

真鲷早期发育阶段行为生态学研究     

刘晓春  何大仁  李大勇 《热带海洋学报》1993,(3)

真鲷Pagrosomus major Temminck et Schlegel早期发育阶段游泳行为的发育可以分为:(1)旋转式运动;(2)阶梯型运动;(3)间断式水平运动和滑翔;(4)巡游以及(5)疾游五种类型。前期仔鱼的摄食方式主要是伴有甩头动作的前冲摄食;后期仔鱼的摄食主要有两种类型:一种是身体弯成S形的“S攻击型”;另一种为不作摄食姿势的“咬食攻击型”。摄食方式随着发育水平和饵料种类的不同而异。文中对发育过程中出现的攻击行为、护食行为、互食行为、猝死现象亦进行了描述。并对游泳、摄食以及各种行为的生态意义和实际意义进行了讨论。  相似文献   

National ocean policy—new opportunities for Malaysian ocean development     

Abdul Hamid Saharuddin   《Marine Policy》2001,25(6)

Being a littoral state, Malaysian maritime sectors provide the basis for the growth and development of marine-related activities. As the country enters the new millennium along with the ‘2020 Vision’ which serves as the basic template against which the economic performance of these sectors should be judged, it poses a new challenge for Malaysia in developing these sectors. This paper attempts to address three basic issues: Firstly, is there any national ocean policy in place? Secondly, are the maritime sectors adequately organized to play an important role in achieving the objectives? Thirdly, what are the opportunities available in developing the ocean?It can be seen that existing policies to develop comprehensive ocean governance have not received the full attention they deserve. Organizational structures governing the ocean for implementing national policies are well in place but in a fragmented and uncoordinated fashion. As a result, sectoral and intersectoral management problems were created such as multiple-use conflicts, overlapping of jurisdiction and duplication of efforts. Environmental problems have also not been properly addressed. A few sectors have been identified as offering opportunities to further develop the Malaysian maritime areas. Among these are marine education and human resources development, marine tourism and the seafood industry.  相似文献   

Embryonic and larval development of Babylonia formosae habei(Altena and Gittenberger, 1981)(Gastropoda: Buccinidae) on China''s coast     

CHEN Yan  KE Caihuan  ZHOU Shiqiang  LI Fuxue 《海洋学报(英文版)》2004,23(3):521-531

The development of embryos and larvae of Babyloniaformosae habei living along the southeast coast of China is observed under laboratory conditions. The egg masses are laid by females on hard substrate at night and each capsule contains 100-500 eggs. Each egg is 250-280 mm in diameter. The fast two cleavages of the embryo are meridional and equal, and a polar lobe is produced. Larval kidney, which only consists of a single cell, appears during the gastrula stage on each side of the embryo. The right tentacle develops prior to the left one. At 25-27 ℃, an intracapsulate veliger stage is reached about 4.5 d after deposition. The larvae hatch on the fifth day as swimming veligers with a shell length of 360 -500 mm. The newly hatched larva can ingest suspended algal cells from the water column and remains in the pelagic stage for 8-10 d. The newly settled juveniles are 900-1 200 mm in shell length.  相似文献   

地震勘探在不同地质条件下的新应用     

卢占武  张宏远 《海洋地质前沿》2005,21(4):28-32,i002

20世纪末，地震勘探技术在油气勘探、煤田勘探、工程勘探等多方面的应用都有了突飞猛进的发展。总结了近年来地震勘探在岩性、沉积相、构造体系等不同地质条件下的应用实例，用以说明地震勘探的多用性及其强大的生命力。  相似文献