Studies on ecological characteristics variation and population dynamics of four lizardfishes in the southern Taiwan Straits

CORC > 厦门大学 > 海洋环境－已发表论文

	Studies on ecological characteristics variation and population dynamics of four lizardfishes in the southern Taiwan Straits
	Du Jianguo ; Lu Zhenbin ; Yang Shengyun ; Chen Mingru ; Yang SY(杨圣云)
刊名	http://dx.doi.org/10.1007/s13131-011-0163-y
	2011-09
英文摘要	Marine Public Welfare Project of China [200805065, 200905019-6, 200705029, 200805064]; Chinese Offshore Investigation and Assessment [908-02-04008]; Scientific Research Foundation of the Third Institute of Oceanography, SOA [2011006]; Marine Science Found; The ecological characteristics of four lizardfishes, Trachinocephalus myops, Saurida undosquamis, Saurida tumbil and Saurida elongata, were studied from specimens (910 T. myops, 454 S. undosquamis, 686 S. tumbil and 744 S. elongata) collected monthly in the southern Taiwan Straits from April 2005 to March 2006. The population dynamics of the four lizardfishes was also discussed by the comparison with the previous studies. All being composed of 7 a classes; the dominant group of T. myops and S. tumbil was 1-2 a, while S. undosquamis and S. elongate were 2-3 a. The total mortality coefficient Z and the fishing mortality F were at high as indicated by the exploitation ratio E(>0.5), and a large number of by-caught juvenile and young fishes showing that the stock of lizardfishes in this area was overexploited and the fishing gear was irrational. Compared with the previous studies, the maximum and mean fork length, body mass and age of the four lizardfishes declined gradually, the lizardfishes populations were younger in age and smaller in size. The asymptotic fork length L-infinity decreased while increasing growth coefficient k, and age at the inflexion point of mass t(r) was younger compared with the previous studies. The declining of older ones has moderated the feeding competition and the younger ones grew faster. The larger mortality parameters Z, M and F have revealed higher fishing pressure. The smaller change of the first mature fork length of female T. myops and the change from K selection pattern to r selection pattern of S. tumbil have indicated a more vulnerable fishery ecosystem in this area. The changes of ecological characteristics and population dynamics may be caused by over-exploitation of demersal fishes such as the lizardfishes, especially a large number of juvenile and young fishes by-catch by the current fishing gears and methods. Therefore, in addition to the traditional fishery management approach such as the minimum length-limit, ecosystem approach to fisheries management (EAF) should be taken to improve the practical marine ecosystem management, including increased fishing intensity of the non-economic species especially the feeding competitors of the lizardfishes and the conservation of the pelagic fishery population in the fisheries ecosystem, in order to restore the fishery population and achieve the sustainable use of the fishery stocks.
语种	英语
出版者	ACTA OCEANOL SIN
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/87788]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	Du Jianguo,Lu Zhenbin,Yang Shengyun,et al. Studies on ecological characteristics variation and population dynamics of four lizardfishes in the southern Taiwan Straits[J]. http://dx.doi.org/10.1007/s13131-011-0163-y,2011.
APA	Du Jianguo,Lu Zhenbin,Yang Shengyun,Chen Mingru,&杨圣云.(2011).Studies on ecological characteristics variation and population dynamics of four lizardfishes in the southern Taiwan Straits.http://dx.doi.org/10.1007/s13131-011-0163-y.
MLA	Du Jianguo,et al."Studies on ecological characteristics variation and population dynamics of four lizardfishes in the southern Taiwan Straits".http://dx.doi.org/10.1007/s13131-011-0163-y (2011).