Although crab Pachygrapsus marmoratus, is one of the common species in the intertidal zones of the Aegean coasts of Turkey, its’ population structure has not been investigated to date. This study aimed to provide information on population characteristics of Pachygrapsus marmoratus, including the sex ratio, size distribution, spawning period, relative growth and catch per unit effort (CPUE). The samples were collected by hand monthly between January 2018 and December 2018, from the rocky shores of Izmir, Turkey. The results indicated that males were dominant except for the months of July, August and September. The CW (carapace width) of female and male crabs ranged from 5.5 to 36.0 mm and 5.5 to 40.0 mm, respectively. The berried (egg-carrying) females were found in May, June and July and their CW varied from 13.0 to 27.0 mm. Only 0.8% of the P. marmoratus population was shown to be infected with the parasite Sacculina sp. The CPUE of P. marmoratus significantly changed monthly and there was a significant correlation between the CPUE and seawater temperature. Concerning the relative growth, the carapace width-cheliped length relationship in males and carapace width-abdomen width relationship in females showed positive allometry. Males were significantly heavier in comparison to females of the same size. Future survey designs would need to investigate whether spatial differences in the population characteristics and size at maturity occur in the Aegean coasts of Turkey.

尽管蟹Pachygrapsus marmoratus是土耳其爱琴海沿岸潮间带的常见物种之一，但迄今为止尚未对其种群结构进行调查。这项研究旨在提供有关Pachygrapsus marmoratus种群特征的信息。，包括性别比例，大小分布，产卵期，相对生长和单位工作量（CPUE）。样品于2018年1月至2018年12月期间每月从土耳其伊兹密尔的多岩石海岸手工采集。结果表明，除了7月，8月和9月这三个月以外，男性占主导地位。雌性和雄性蟹的CW（甲壳宽度）分别为5.5至36.0 mm和5.5至40.0 mm。在5月，6月和7月发现了带卵（带卵）的雌性，其CW从13.0到27.0 mm不等。仅有0.8％的体育黑猩猩感染了寄生虫Sacculina sp。P. marmoratus的CPUE每月变化显着，CPUE与海水温度之间存在显着相关性。关于相对生长，雄性的背甲宽度-鹅掌长度关系和雌性的背甲宽度-腹部宽度关系显示出正的异向性。男性比同等大小的女性要重得多。未来的调查设计将需要调查土耳其爱琴海沿岸的人口特征和成熟时的规模是否存在空间差异。