Morphological measurements for O. cyanea derived from visual strip transects and commercial catch sampling in Lakshadweep islands, India

The data comes from O. cyanea derived from visual strip transects and commercial catch sampling carried out around Agatti and Kavaratti islands (Arabian Sea) during three survey periods between November 2008 and 20 April 2012. Given that octopus fisheries in these islands are constrained by depth owing to the nature of spear-fishing and gleaning techniques (Silas et al., 1985; Appukuttan et al., 187 1989), we surveyed only the lagoon and intertidal areas of the two islands. The depths of the surveyed areas varied from 0.5 to 3 m. Mantle length (ML = dorsal mantle length) was measured using a 1 mm graduated 210 tape and weight (TW = total body weight) was obtained using a spring balance graduated with 50 g intervals.

本数据集的样本源自O. cyanea（青蛸，Octopus cyanea），数据通过视觉样带法（visual strip transects）与商业渔获采样获取。采样工作于2008年11月至2012年4月20日期间，在阿拉伯海阿加蒂岛与卡瓦拉蒂岛周边海域开展，共完成3次调查。鉴于该海域的章鱼捕捞受水深限制（矛钓与潮间带捡拾作业的特性所致，Silas等，1985；Appukuttan等，1989），本次调查仅覆盖两座岛屿的泻湖与潮间带区域。调查区域的水深范围为0.5至3米。外套膜长（ML = 背外套膜长，dorsal mantle length）采用量程210厘米、分度值1毫米的卷尺测量；总体重（TW = 总体重，total body weight）则通过分度间隔为50克的弹簧秤获取。