Anguillid leptocephali of three Congridae species (Conger conger, Ariosoma balearicum and Gnathophis mistax) were caught as bycatch of pelagic trawls during acoustic surveys targeting small pelagic fish species in the southern Adriatic Sea, carried out under the framework of the Italian MEDIAS project (western side) and its extension in the ambit of the FAO AdriaMed project (eastern side). Results refer to the findings of Congridae leptocephali during surveys conducted in 2011, 2014, 2015 and 2016. A total of 25 specimens were caught and analysed (morphological features and pigmentation patterns). Leptocephali of Conger conger were found in the range of 8.4–13.1 cm total length (TL) (between 50 and 132 m depth), Ariosoma balearicum from 9.7–12.2 cm TL (between 50 and 128 m depth) and for Gnathophis mystax in the range from 6.4–11.7 cm TL (between 40 and 79 m depth). The results indicate that the southern Adriatic Pit could be the spawning area of these species in the Adriatic Sea. Present data represent a contribution to existing knowledge about the ecology of leptocephali from the Congridae family in the southern Adriatic Sea, and also indicate the existence of differences in morphometric parameters between different areas, that is, the possibility of the existence of new geographic lines within the genus Ariosoma in the Adriatic Sea.

中文翻译：

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亚得里亚海南部细头绦虫形态特征的新观察

三种琵琶科动物的细头鳗鲡 (海鳗,巴利阿里云杉和螳螂) 在意大利 MEDIAS 项目（西侧）及其在粮农组织 AdriaMed 项目范围内的扩展（东侧）的框架下进行的针对亚得里亚海南部小型中上层鱼类的声学调查期间，作为中上层拖网的副渔获物被捕获）。结果参考2011年、2014年、2015年和2016年进行的Congridae leptocephali调查结果。共捕获并分析了25个标本（形态特征和色素沉着模式）。细头虫海鳗在 8.4–13.1 cm 总长度 (TL) 范围内（深度介于 50 和 132 m 之间），巴利阿里云杉从 9.7–12.2 cm TL（深度在 50 和 128 m 之间）和蝮蛇在 6.4–11.7 cm TL（深度在 40 到 79 m 之间）的范围内。结果表明，南亚得里亚海坑可能是这些物种在亚得里亚海的产卵区。目前的数据代表了对亚得里亚海南部Congridae科细头动物生态学现有知识的贡献，也表明不同区域之间存在形态参数差异，即存在新地理线的可能性。属阿里奥索马在亚得里亚海。