摘要
于1985—1988年对前额间银鱼生物学特性、资源变动状况及其原因进行了现场和社会调查。调查表明,前颌间银鱼资源变动的原因是南、西区和吴淞口三大污染源对其生态环境严重污染;同时还有多年持续过捕超过其再增殖能力。为此,提出治理污染,恢复前颌间银鱼的生活环境及保护繁殖亲体的对策和建议。
The datum (1959-1987) on the production output of Hemisalanx prognathus Regan, fishing boats, net numbers, hydrological data, meteorological phenomena and drainage waste water were collected from some Chongming, Baoshan counties of Shanghai and Shazhou, Changshu and Taicang counties of Jiangsu Province during the investigation of 1985-1988. The biological character, migratory distribution, eggs and larvae of Hemisalanx prognathus Regan were investigated. Samples were collected with picking net and plankton nets at 77 locations in Hangzhou Bay and Changjiang River Estuary from Hengsha to Jiangyin. Unpolluted water was compared with the polluted water from the western of the estuary.The investigation showed Hemisalanx progiathus Regan has a life span of only one year. The main spawning ground is the area from the Qigan River to the Xijie Harbour. Hemisalanx prognathus spawns abundantly fecundity about 4148-9445 sticky ova from March to early April. The highest yield was 944.6t (1960), the lowest was only 24.3t (1987).The main cases for the stock variation of Hemisalanx prognathus was pollution of the water. There were three main pollution outlets i.e. the south and west districts and Wusong estuary. Daily input of drainage waste water re ched 619.4×104t, and dissolved oxygen (DO) was only 0.7mg/L. These destroyed the ecological environment of Hemisalanx prognathus, and the broodfish, and juveniles died. The fishing intensity of the stabilized phase (1964-1973) continued during the 'debilitated phase (1974-1987), so overfishing was the other reason for the decreased stock of Hemisalanx prognathus.Countermeasures against the pollution are suggested in order to restore the ecological balance and protect the Hemisalanx prognathus broods.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1992年第5期517-526,共10页
Oceanologia Et Limnologia Sinica
关键词
前颌间银鱼
资源
变动
污染
银鱼
Hemisalanx prognathus Regan, Stock variation, Pollution, Overfishing, Protection.
