赤潮对海水养殖业的危害与防治对策

赤潮对海水养殖业的危害与防治对策王方国（国家海洋局第二海洋研究所，杭州，３１００１２）１前言近几年来，一些海域富营养化加重，引起赤潮灾害不断增多。１９９０年中国沿岸海域从南到北，相继发生较大面积的赤潮３４起，为１９６１～１９８０年这２０年平均值的３Ｏ...     

湛江港浮游植物与赤潮植物的初步研究

于1987年8月在湛江港设13个点采样。鉴定表明，共有浮游植物37属94种和变种；优势种类有中肋骨条藻、日本星杆藻、佛氏海毛藻等。湛江港浮游植物密度较高，港内外平均达1．3×104cell／L和7．3×105cell／L。经单项营养指数和营养状态结合指数分析表明，除两个点无机氮浓度略超标外，所有站位均未达到富营养化水平。调查期间，共发现赤潮生物31种，其中主要有中肋骨条藻、日本星杯藻、佛氏海毛藻、尖刺菱形藻和夜光藻等，中肋骨条漠和日本星杆藻曾形成水华。     

Structure of a pair of anticyclonic vortices in northern part of the South China Sea in autumn of 1994

A pair of remarkable meso-scale anticyclonic vortices, one formed closely to another, inthe northern part of the South China Sea during the period from the later August to early September of 1994 were documented by the in situ observation data. Their spatial structures were examined in detail from the horizontal and two nearly perpendicular/vertical angles of view. It was shown that the horizontal scales of these two vortices were around 100, 50 km, and their vertical scales were about 500, 1000 m, respectively. Two "warm core" structures associated with these two vortices were found in their horizontal and vertical analyses. The closer spacing of these two vortices (namely, 60 km), which was smaller than the Rossby radius of deformation, suggested that they might merge with each other during their next evolution stages and form into a larger vortex eventually.     

长江口中肋骨条藻赤潮的分布与特点

对1990年6月9～25日在东海赤潮多发区海域调查期间所观察到的5次中肋骨条藻赤潮的特点以及与环境要素变化的关系作了初步分析。结果表明:(1)中肋骨条藻是多发区海域夏季的敏感赤潮生物,风速减小、气压下降以及良好的海况条件有利于赤潮的发生;(2)赤潮发生时发生区边界存在明显的界面变化特征,这种空间界面的环境要素变化与赤潮发生的时间变化特点是一致的。     

浅海、内湾受虾池排污影响出现的某些生态现象分析

在养虾规模比较大的浅海、内湾,受虾池排污影响,出现了一些生态现象。例如,初级生产力提高,渔业资源量(特别是一些滤食性贝类)明显增长,养殖扇贝生长快,肥满度高,产量增加。由此人们有理由联想,鱼、虾、贝混养有可能很好地生长,而受虾池排污影响的浅海、内湾似乎更不应有问题。同时,     

虾池长竹蛏肥满度的研究

本文作者于1997年4月至1998年3月期间，对幸福洋垦区虾池生长的长竹蛏进行了周年肥满度测定研究.结果表明长竹蛏5～9月份较肥，肥满度在60％～80％之间，11月至翌年4月份较瘦，肥满度在55％～47％之间；根据肥满度的测定，长竹蛏的繁殖期为6～8月份.