| 基于渔捞日志的长江靖江段刀鲚渔获量的时空特征分析 |
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| 引用本文： | 郭弘艺,沈林宏,唐文乔,陈浩洲,顾树信,李辉华.基于渔捞日志的长江靖江段刀鲚渔获量的时空特征分析[J].上海海洋大学学报,2014,23(5):774-781. |
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| 作者姓名： | 郭弘艺 沈林宏 唐文乔 陈浩洲 顾树信 李辉华 |
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| 作者单位： | 上海海洋大学鱼类研究室 |
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| 基金项目： | 公益性行业(农业)科研专项(201203065)；高等学校博士学科点专项科研基金(20123104110006) |
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| 摘 要： | 江苏靖江段位于近长江口段,是长江刀鲚渔汛最集中的水域。为了弄清靖江段刀鲚的渔汛特征,本文于2008-2009年和2012-2013年对16艘持刀鲚捕捞许可证的渔船作了渔获量监测,分析了渔获量的时空变化及其环境影响。结果表明,靖江段单船日渔获数量NB和重量WB分别为(21±38)ind./d和(2.0±4.1)kg/d,单船全汛总渔获尾数Nt和重量Wt为(890±929)ind.和(92.3±91.1)kg。NB和Nt具有一致性的年变化趋势,以2013年的最大,其他年份比较接近。但WB和Wt的年变化趋势与渔获数量的年变化趋势有所不同,表现为2008-2012年间持续下滑,2013年显著增长。NB和WB在2-3月间均极低,但4月增至(23.0±31.3)ind./d和(2.4±3.5)kg/d,5月达(78.0±81.0)ind./d和(7.7±9.1)kg/d。ANOVA分析显示,西水域的年NB和WB分别为东水域的2.5和2.7倍。研究亦显示,靖江段刀鲚的WB与同日水温和最高潮位均呈极显著的正相关(P﹤0.05)。长江口外的水温提升,可能是刀鲚开始生殖洄游的重要环境诱导因子。而高潮期在靖江段出现最高渔汛,可能是因为所采用的固定刺网过滤了更多的江水所致。
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| 关 键 词： | 刀鲚 长江靖江段 渔捞日志 单位渔获努力量 生态因子 |
| 收稿时间： | 2014/3/21 0:00:00 |
| 修稿时间： | 5/9/2014 12:00:00 AM |
Distribution characteristics and temporal and spatial changes of Coilia nasus catches at Jingjiang section of the Yangtze River in fishing season based on the data from fishing log |
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| GUO Hong-yi,SHEN Lin-hong,TANG Wen-qiao,CHEN Hao-zhou,GU Shu-xin and LI Hui-hua.Distribution characteristics and temporal and spatial changes of Coilia nasus catches at Jingjiang section of the Yangtze River in fishing season based on the data from fishing log[J].Journal of Shanghai Ocean University,2014,23(5):774-781. |
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| Authors: | GUO Hong-yi SHEN Lin-hong TANG Wen-qiao CHEN Hao-zhou GU Shu-xin and LI Hui-hua |
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| Institution: | Laboratory of Ichthyology,Shanghai Ocean University,Ministry of Education Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources |
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| Abstract: | Jingjiang section of the Yangtze River, which is an important area for fishery resource conservation and reproduction of anchovy, is located at the connected region of lower reaches and estuary of Yangtze River.In 2002, Ministry of Agriculture of the People's Republic of China decided to carry out fishing ban in Yangtze River.Fishing boats would not be allowed to fish Coilia nasus in Yangtze River unless they have special fishing license during the period of spring closed fishing season.The fishing season of anchovy in Jiangsu section is approximately divided by the the Jiangyin Yangtze River Highway Bridge.We monitored daily variation in C.nasus catches based on log data of anchovy from 16 fishing boats in Jingjiang section of the Yangtze River from February to May in 2008, 2009, 2012 and 2013, and analyzed temporal and spatial variations in C.nasus catch as they relate to environmental factors.Results showed that the daily catch number (NB) and daily catches weight per boat (WB) ranged from 0 to 351 ind./d and from 0 to 39.5 kg/d, with an average of (21±38) ind./d and (2.0±4.1) kg/d, respectively.Meanwhile, total annual catch (Nt)and total annual catch (Wt) per boat ranged from 130 to 3952 ind.and from 10.9 to 435.6 kg, with a mean of (890±929) ind.and (92.3±91.1) kg in fishing season, respectively.NB and Nt showed the similar annual variation trend, the maximal peak NB and Nt occured in 2013, and other years' NB and Nt maintained at relatively low level.However, annual variation trend of catch weight was different from that of catch number.WB and Wt continued to decline from 2008 to 2012, and then a significant rise was found in 2013.As fishing season progressed, the NB and WB increased markedly.NB and WB were very low in February and March, then increased to (23.0±31.3) ind./d and (2.4±3.5) kg/d in April, and reached a maximum in May, Which were (78.0±81.0) ind./d and (7.7±9.1) kg/d, respectively.The ANOVA analysis showed that NB and WB in west water area of Jiangyin Yangtze River Bridge were significantly higher than those in east water area (P<0.001).NB and WB in west water area were 2.5 and 2.7 times those in east water area.Highly significant correlations were obtained between WB and daily water temperature and between WB and the maximum daily water level (P<0.05).The results suggested that the rise of water temperature off Yangtze River Estuary may be an important environmental factor, which can induce C.nasus to start migration.Further, the peak WB appeared near the highest water level, probably because of the fixed net filtering more river water. |
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| Keywords: | Coilia nasus Jingjiang section of the Yangtze River fishing log catch per unit effort (CPUE) ecological factor |
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