The crocodile shark Pseudocarcharias kamoharai (Matsubara, 1936) is a species caught incidentally off the coast of Ecuador with no commercial importance in the country. As with many elasmobranch species, very little is known about its general biology. The aim of this study was to provide baseline information to enhance the knowledge on various aspects of the biology of this species. During the years 2003–2009, a total of 59 individuals of P. kamoharai were landed by commercial fishing in Ecuadorian waters. The total length (TL) ranged 50–113 cm. On average, the females were larger than males (91.8 ± 2.2 and 84.1 ± 4.1, respectively) and the number of females captured was higher (sex ratio = 1.9F:1M). Based on the morphology of the claspers, males were considered mature at 80 cm TL and at a clasper length of 6 cm, and 70% of the males caught were mature. The squid Ancistrocheirus lesueuri was the only prey observed in two shark stomachs with food from 59 shark stomachs analyzed. This study provides biological information of P. kamoharai in Ecuador and will help as a baseline to generate data and increase our knowledge of the biology of this shark species in the eastern Pacific Ocean.

鳄鱼鲨Pseudocarcharias kamoharai（松原，1936年）是在厄瓜多尔沿海偶然捕获的一个物种，对该国没有任何商业意义。与许多弹性分支物种一样，对其一般生物学知之甚少。这项研究的目的是提供基线信息，以增强对该物种生物学各个方面的知识。在2003 - 2009年，一共有59个个人P.锥齿鲨在厄瓜多尔水域被商业捕鱼登陆。总长度（TL）为50-113厘米。平均而言，女性比男性大（分别为91.8±2.2和84.1±4.1），捕获的女性数量也更多（性别比= 1.9F：1M）。根据拍子的形态，雄性被认为在80 cm TL和拍子长度为6 cm时是成熟的，被捕获的雄性中有70％是成熟的。鱿鱼Ancistrocheirus lesueuri是在两个鲨鱼胃中观察到的唯一猎物，分析了59个鲨鱼胃中的食物。这项研究提供了厄瓜多尔kamoharai的生物学信息，并将作为基线来产生数据并增加我们对东太平洋这种鲨鱼物种生物学的了解。