遮浪湾浮游幼虫的季节分布     

蔡国雄 《热带海洋学报》1992,(1)

本文分析遮浪湾浮游幼虫的季节分布及其与环境因子的关系,并讨论其它有关生态问题。湾内浮游幼虫总数量和主要类群数量的季节变化呈现典型的亚热带海区的双周期型,数量的平面分布随离岸距离增加而增多,水温过低或过高和低盐度均对幼虫的生长活动不利。湾中甲壳动物的无节幼虫最丰富,多毛类和棘皮动物的浮游幼虫次之。  相似文献   

Relationships between sea surface temperature, salinity, and pelagic fish distribution off northern Chile   总被引：2，自引：0，他引：2  

Castillo  J.; Barbieri  M. A.; Gonzalez  A. 《ICES Journal of Marine Science》1996,53(2):139-146

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盐度及饵料对马粪海胆幼体生长发育及变态的影响   总被引：3，自引：0，他引：3  

张鹏  曾晓起  尤凯 《海洋湖沼通报》2004,23(4):75-80

本文以马粪海胆为研究对象 ,对其成熟卵的受精率与受精卵的孵化过程以及其浮游幼体在不同实验条件下的生长发育进行研究。研究结果表明 :盐度在 2 7～ 35间的受精率可达95 %左右 ,最适盐度为 31,受精率可达 10 0 % ,盐度高于 35或低于 2 7受精率都将明显下降 ;以角毛藻作为马粪海胆浮游幼体的饵料效果最好 ,成活率可达 6 0 % ,体长可达 76 9μm ;早期投饵密度为 10 4 cell/mL ,后期投饵密度为 8× 10 4 cell/mL ;三角褐指藻饵料效果略差于角毛藻 ,扁藻适宜作为马粪海胆浮游幼体后期饵料。  相似文献   

福建三沙湾浮性鱼卵和仔、稚鱼的分布   总被引：6，自引：1，他引：6  

戴燕玉 《台湾海峡》2006,25(2):256-261

本文根据1990年2～11月在三沙湾海域分别进行4个季节调查的资料,对三沙湾鱼卵和仔、稚鱼的种类组成、丰度和主要种类的分布进行研究和探讨.结果表明,本海区共出现鱼卵和仔、稚鱼26种,分别隶属于17科22属.在数量上,鱼卵最高值出现在春季（5月）,其中鱼卵丰度较高的种类是真鲷、带鱼、鲾和康氏小公鱼等种类.仔稚鱼以夏季丰度最高,并以鰕虎鱼丰度（71.8%）最高.在分布上,鱼卵的丰度以三都岛东北部和东吾洋海域最高,仔稚鱼以三都岛东部最为密集.这表明本海区的鱼类的主要产卵季节是春季和夏季.其数量、分布与水温及桡足类的分布关系密切.  相似文献   

天然海水河蟹工厂化育苗研究——大水体生产性育苗试验     

李才根 《海洋学研究》1996,14(3):27-32

本文报导了利用对虾育苗设施，进行天然海水河蟹工厂化育苗生产性试验。试验结果令人满意，６９６只亲蟹产出蟹苗１７６４万只。文中讨论了亲蟹的暂养与促产、幼体孵化、幼体培育等主要技术环节。  相似文献   

真鲷仔,稚,幼鱼期消化酶活性的变化   总被引：17，自引：4，他引：17  

陈品健  王重刚 《台湾海峡》1997,16(3):245-248

本文研究了真鲷仔，稚，幼鱼不同发育期三种消化酶活性的变化，结果表明，蛋白酶活性两个极低点分别出现在受精后５日龄和２５日龄，２５－４４日龄蛋白酶活性上升明显，之后活性上升稍缓；淀粉酶从受精后到５日龄活性急剧下降，５－４４日龄变化很小，４５日龄后活性略有提高；脂肪酶活性从受精后至５日有所提高，４０日龄活性到最低点，之后上升较快。  相似文献   

Phosphorus and nitrogen cyclings in the pelagic system of hiroshima bay: Results of numerical model simulation     

Jutarat Kittiwanich  Tamiji Yamamoto  Toshiya Hashimoto  Keiko Tsuji  Osamu Kawaguchi 《Journal of Oceanography》2006,62(4):493-509

A numerical ecosystem model expressing both phosphorus and nitrogen cyclings in the pelagic system of Hiroshima Bay, Japan, was developed in order to investigate the seasonal variations of these elements and their annual budgets. Based on the geophysical and chemical structures of the bay, Hiroshima Bay was divided into northern and southern boxes, themselves divided into two layers of an upper 5 m and a lower layer according to the stratification of the water column. The model consists of equations representing all relevant physical and biological processes. The results revealed that the internal regeneration of materials was an important source of bioavailable nutrients for phytoplankton growth in the water column. The incorporation of phytoplankton aggregation improved the accuracy of the outputs in comparison to the observed data, especially during the stratified summer season. The results also indicated that phosphorus limitation of phytoplankton growth occurs in the upper layer during summer while light limitation occurs in the lower layer. In addition, physical processes such as diffusion and advection were also important as they ensured that most of regenerated nutrients in the lower layer were transported to the upper layer. Thus, these processes might support the high primary production and the production of oysters that are extensively cultured in this bay. Considering the informative results obtained, the model used in this study provides a sound basis and tool to describe the dynamics of phosphorus and nitrogen cyclings in Hiroshima Bay.  相似文献   

The State of the Adriatic Sea Centered on the Small Pelagic Fish Populations   总被引：1，自引：0，他引：1  

Massimo Azzali  rea De  Felice  Manlio Luna  Giulio Cosimi  Flavio Parmiggiani 《Marine Ecology》2002,23(S1):78-91

Abstract. The paper provides an overview of the state of the small pelagic fish in the Adriatic Sea. The North Adriatic is reviewed for the 1976–1998 period and the South Adriatic for the 1987–1998 period. First the fluctuations in time and in space of the pelagic biomass, as a whole and per species, are presented. Then the dramatic collapse of anchovy stock and its apparent association with the decrease of surface temperature is discussed. Finally the changes of the anchovy and sardine catches are compared and analysed with respect to their abundances in the sea. The conclusion is that acoustic and satellite methods are able to provide a large amount of information on the variability in the pelagic populations; this is essential for an appropriate management of these resources. There is still a need, however, to refine the methods and to integrate this kind of information with further environmental data (including natural predators).  相似文献   

Study on halotolerance of phyllosoma larva of Chinese spiny lobster (Panulirus stimpsoni Holthuis)     

Chen Changsheng  Chen Zhengqiang  Hu Jiacai  Ye Zhaohong  Ji Dehu  Lan Liangchun 《海洋学报(英文版)》2001,20(3):409-415

INTRODUcrIONAs a quality seaha, lobster has a greater market demand or higher demand than supply. Inrecent years the natural resource of lobster is decreasing day by day due to overfishing oPera-tions. Conequently, an attention has been increasingly drawn to the development of artificialbreeding in lObster and seedstock preduction. From the l970s to the l980s the culture of lobsterlarva started but with very slow pngress. Inoue et al. (l978), Yamakawa et al. (1989), Kitta-ka and Kimura(l…  相似文献   

闽东北外海渔场捕捞中上层鱼类的渔具,渔法研究     

王芳灿 《台湾海峡》1995,14(4):413-417

本文分析了闽东北外海渔场资源特点，并就不同类型的拖网、围网渔具的适渔性对比试验进行了研究，认为以主机功率330.75kw及以上的拖网渔船，使用四片式疏目拖网和以主机功率183．75kw及以上的围网渔船，使用250m×150m的无囊灯光围网，于春、夏汛时在该渔场100m等深线附近海域能较有效地捕捞鲐鲹等中上层鱼类。  相似文献