文章摘要
赵静,章守宇,周曦杰,陈清满.浙江嵊泗枸杞岛岩礁生境两种刺网采样网具的比较[J].水产学报,2013,37(2):311~320
浙江嵊泗枸杞岛岩礁生境两种刺网采样网具的比较
Comparative analysis of two sampling gillnets of rocky reef area in Gouqi Islands,Shengsi,Zhejiang
投稿时间:2012-03-29  修订日期:2012-09-29
DOI:DOI:10.3724/SP.J.1231.2013.38072
中文关键词: 岩礁生境  刺网  渔获物组成  采样比较
英文关键词: rocky reef area  gillnet  catch composition  survey method comparison
基金项目:国家“九七三”前期课题(2011CB111608);国家自然科学基金项目(41176110);国家海洋公益性项目(201005013);上海市重点学科建设项目(J50702)
作者单位
赵静 上海海洋大学海洋科学学院 
章守宇 上海海洋大学海洋科学学院 
周曦杰 上海海洋大学海洋科学学院 
陈清满 上海海洋大学海洋科学学院 
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中文摘要:
      为寻求适宜于岩礁生境的采样网具和采样方式,于2011年7、8月份进行欧洲引进的定置单片刺网和国内常用定置三重刺网的对比实验,对两种不同采样网具的渔获物组成和差异进行了分析,结果显示:(1)定置单片刺网的渔获量和种类数显著低于定置三重刺网,定置单片刺网捕获鱼类20种,渔获物8 572.6 g,定置三重刺网捕获鱼类29种,渔获总重为20 793 g;(2)定置单片刺网的主要优势种类为褐菖鲉、斑头鱼、棘头梅童鱼,定置三重刺网的主要优势种类为褐菖鲉、鲐、棘头梅童鱼、斑头鱼,欧洲定置单片刺网对鱼类种类的选择稍强于定置三重刺网;(3)两种网具获得的岩礁生境多样性指数无显著性差异,但两种网具的渔获物相似度并不高,仅为0.41;(4)两种网具对渔获大小的选择性不同,定置单片刺网渔获的平均体长为106.1 mm,定置三重刺网为119.1 mm;(5)不同网目下鱼类分布具有一定的选择性,优势种类褐菖鲉、斑头鱼、棘头梅童鱼等集中分布在几个网目尺寸。通过对比实验发现,定置三重刺网的渔获率高于定置单片刺网,渔获体长分布较广,反映的多样性指数并无差异,两者均通过多网目组合来消除选择性强的特点,但欧洲定置单片刺网的设计构造强度较低,渔获效率较低,相比之下,定置三重刺网较为适宜岩礁生境的调查。
英文摘要:
      The survey experiment of two different type of gillnets was carried out at rocky reef area to find the suitable survey nets for rocky habitat during July and August in 2009.Indices such as Sorensen similarity,Margalef’s species richness index,Shannon-Wiener diversity,Peilou’s species evenness index were calculated,and the constitution and difference of catch were analyzed.Results showed that (1)Catch and species of European gillnet were lower than multi-mesh trammelnet.20 species was caught by European monolayer gillnet,and total weight was 8 572.6 g while 29speceies and 20 793 g catch by multi-mesh trammelnet.(2)Dominant species of European gillnets were:Sebastiscus marmoratus,Hexagrammos agrammus,Collichthys lucidus and multi-mesh trammelnets’ dominant species were:Sebastiscus marmoratus,Hexagrammos agrammus,Collichthys lucidus,Scomber japonicas.The selectivity of European gillnets was much higher than multi mesh trammelnets.(3)European gillnet and multi mesh trammelnets had no significant difference in community structure index,but index of Sorensen similarity was only 0.41,which showed that the species of two gillnets is different.(4)It is suggested that the selectivity of two gillnets was different,the average length of catch was 106.1 mm for European gillnet and 119.1 mm for trammelnets.(5)Different species are distributed in different mesh gillnets,the dominant species such as Sebasticus marmoratus,Hexagrammos agrammus distributed mainly in five mesh gillnets.Our research indicates that the indices of fish community have no significant difference,however,multi mesh trammelnet has a high catch efficiency,and is more durable than European monolayer gillnets for survey in rock reef area.
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