AN OVERVIEW OF RESEARCH ACTIVITIES ON SWORDFISH ( XIPHIAS GLADIUS ) AND THE BY-CATCH SPECIES, CAUGHT BY THE SPANISH LONGLINE FLEET IN THE INDIAN OCEAN.
AN OVERVIEW OF RESEARCH ACTIVITIES ON SWORDFISH ( XIPHIAS GLADIUS ) AND THE BY-CATCH SPECIES, CAUGHT BY THE SPANISH LONGLINE FLEET IN THE INDIAN OCEAN.
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发表时间：
2006
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通讯作者：
J. Mejuto;B. García-Cortés;A. Ramos-Cartelle
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作者：
J. Mejuto;B. García-Cortés;A. Ramos-Cartelle
.本文介绍了过去几年根据西班牙水面延绳钓船队提供的数据对印度洋箭鱼和叉尾鱼进行研究所取得的一些最相关的结果。报告还提供了2003年和2004年关于该船队活动的最新资料。提供了新的信息繁殖的箭鱼的基础上大的采样覆盖率。建议在印度洋箭鱼的繁殖区，这似乎是限制在西部地区的性腺指数的数据，性别比例的大小和其他现有的信息从观察员。产卵型性别比例的大小特征模式也确定在这个海洋。产卵类型的观察表现出高值的性腺指数的地区。对箭鱼和相关物种进行标记程序的可用信息进行了审查，并比较了捕获率。报告还概述了副渔获物种类、意外副渔获物、割鳍做法和灰锯鲷生殖参数的资料。为了比较各区和从等于或大于150厘米长距地面高度（131厘米长距地面高度）的女性获得的数据集，提供了图表，其中显示了两个时期（1993-1994年和1998-2002年）内有数据的各区按体型分类的平均地理指数及其各自的置信区间（95%）。还用5ºx5º的正方形绘制了两个时期内女性长JFL>150厘米的不同GI 1范围的流行率，并根据2003年和2004年在印度洋东部地区获得的新GI 1数据进行了更新。为绘图定义了三个GI 1范围：GI 1 ==5。1993年至2003年期间，西班牙水面延绳钓船队的广泛地理分布及其船上观察员的科学监测为我们提供了对81 560个灰腹锯鲷样本的零星和具体观察，重点是在大西洋、印度洋和太平洋不同区域观察到的灰腹锯鲷的生殖参数（MEJUTO和GARCINA-CORTÉS，2005年）。所检查的区域位于大西洋北纬40度至南纬35度：西经55度至东经15度之间，印度洋北纬5度至南纬30度：西经35度至东经75度之间，太平洋北纬25度至南纬40度：西经85度至西经135度之间。观察结果最初被分组为5ºx5º的正方形。随后，为了适应不同的分析，数据暂时分为22个区，也分为5个区域：北大西洋区域（ATLN）：区01，02，03，04，06，91，92，93。中大西洋地区：07、08、09、10区。南大西洋区域：11、12、13、15区。印度洋区域：52、53、54、55区。太平洋区域：40、44区（图2）。关于方法细节的更多信息，见上文引用的文件。
. This paper presents some of the most pertinent results obtained over the last few years from the research carried out on the swordfish and bycath species in the Indian Ocean on the basis of data taken from the Spanish surface longline fleet. Information on the activity of this fleet updated for 2003 and 2004 is also given. New information on the reproduction of the swordfish based in large sampling coverage is provided. Reproduction areas of swordfish in the Indian Ocean are proposed, which seems to be restricted to western areas based on data for gonadal indices, sex-ratios at size and other available information taken from observers. Characteristic patterns of spawning-type sex-ratio at size are also identified in this Ocean. The spawning type is observed for the areas exhibiting high values on the gonadal index. A review of the available information on the tagging programs conducted on the swordfish and associated species is also done, with a comparison of the recapture rates obtained. Information on by-catch species, accidental by-catches, finning practices and the reproductive parameters of Prionace glauca are also summarized. according For the purpose of comparing zones and the data set obtained from females equal to or greater than 150 cm LJFL (131 cm EFL), graphs are provided with average GIs by size class and their respective confidence intervals (95%) in the two periods (1993-1994 and 1998-2002), for those zones for which data were available. The prevalence of the different GI1 ranges for females LJFL>150 cm has also been plotted by 5ºx5º square for both periods and updated with information of new GI1 data obtained during 2003 and 2004 in eastern areas of the Indian Ocean. Three GI1 ranges have been defined for plotting: GI1==5. The wide geographic distribution of the Spanish surface longline fleet and its scientific monitoring with on board observers have provided us with sporadic and specific observations of 81,560 specimens of Prionace glauca (PGO) between 1993 and 2003, focusing on the reproductive parameters of PGO observed in different zones of the Atlantic, Indian and Pacific Oceans ( MEJUTO & GARCÍA - CORTÉS 2005). The areas examined were located between 40ºN-35ºS: 55ºW-15ºE in the Atlantic, between 5ºS-30ºS : 35ºE-75ºE in the Indian Ocean and between 25ºN-40ºS : 85ºW-135ºW in the Pacific Ocean. The observations were initially grouped into 5ºx5º squares. Subsequently, to accommodate the different analyses, the data were tentatively classified into 22 zones and also into 5 regions: North Atlantic Region (ATLN): zones 01,02,03,04,06,91,92,93. Central Atlantic Region (ATLC): zones 07,08,09,10. South Atlantic Region (ATLS): zones 11,12,13,15. Indian Ocean Region (INDI): zones 52,53,54,55. Pacific Ocean Region (PACI): zones 40,44 (figure 2 ). More information on methodological details can be found in the paper previously cited.