长江靖江段刀鲚资源调查报告

The Yangtze River in Jingjiang section of Coilia nasus resources investigation report

2006—2011年每年1—5月，选择靖江市新桥和新港的沿岸作为采样地点，采用4艘刀鲚捕捞渔船，捕捞网具为42和48口73鲚捕捞流刺网，网目60mm。分别对0．1kg／尾以下小73鲚，0．1-0．15k∥尾的中刀鲚和0＋15kg/尾以上大73鲚进行统计分析。调查结果发现，1—3月份刀鲚产量占当年总产量的百分比明显下降，由2006年的9．45％、14．96％和28．35％下降至2011年的1．58％、4．11％和15．19％。4—5月份的刀鲚产量占当年总产量的百分比上升，以5月份的上升最为明显，从2006年16．53％上升至2011年41．14％。刀鲚总产量从2006年1270kg下降至2011年的316kg。刀鲚渔获物中，小刀鲚所占比重呈上升趋势，最低年份为2006年12．70％，最高年份为2009年16．45％，中刀鲚所占比重基本稳定，大刀鲚所占比重有下降趋势。

From January to May in 2006-2011 years, choose Jingjiang city Xinqiao and Xingang coast as the sampling sites, the 4 ships of Coilia nasus fishing, fishing nets 42 and 48 Coilia nasus fishing drift nets, mesh 60 mm. On 0.1 kg/tail following small Coilia nasus, 0.1 - 0.15 kg/tail of Coilia nasus and 0.15 kg/tail above big Coilia nasus for statistical analysis. The survey found that, from January to March, monthly Coilia nasus accounted for total annual yield percentage decreased obviously, by 2006 9.45%, 14.96% and 28.35% fell to 1.58%, 4.11% and 15.19% in 2011. Coilia nasus yield of April to May for that year total output percentage increase, yield of May increased most significantly, from 2006 16.53% Up to 2011 41.14%. The total output of Coilia nasus from 1 270 kg in 2006 dropped to 2011 316 kg. In Coilia nasus catches, small specifications of Coilia nasus proportion was rising, the lowest for 12.70% years in 2006, the highest in 2009 16.45%, in the specifications of Coilia rtasus proportion basically stable, large specification of Coilia nasus proportion has decreased.