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东海是我国赤潮的多发海区。近十余年来有关的海洋、水产研究单位先后开始了对东海的赤潮进行研究工作。初步研究表明,引起东海赤潮频度最高的生物为夜光藻和束毛藻,此外,也出现多种类的混合型赤潮。东海赤潮通常形成于营养物质丰富的河川径流影响明显的河口锋区(长江口和杭州湾)及上升流海区(浙江中部沿海)。在短期内(约一周)海水C迅速增温大于2℃者及连续天数较长的潮湿闷热天气持续一周以上者,均可视为赤潮暴发的预警性征兆。赤潮对渔业的危害表现为,破坏渔场饵料基础导致渔获量下降;影响贝藻类生长,导致贝藻死亡.
The East China Sea is the frequent area of red tide in our country. In the past ten years, relevant marine and aquatic research units have started to research the red tide in the East China Sea. Preliminary studies have shown that the organisms that cause the highest frequency of red tide in the East China Sea are the noctiluca and the algae. In addition, there are also many types of mixed red tides. The red tides in the East China Sea are usually formed in Hekoufeng (Changjiang Estuary and Hangzhou Bay) and upwelling areas (the central Zhejiang coast) where nutrient-rich river runoff is significantly affected. In the short term (about one week), the rapid warming of seawater C by more than 2 ℃ and the continuous hot and humid weather lasting more than one week may be regarded as an early warning sign of red tide outbreak. The harmful effects of red tide on the fishery are as follows: the fish bait foundation is destroyed due to destruction of fishing grounds; the growth of shellfish is affected and the death of shellfish is caused.