There is a vital necessity to provide more biological data on rays and sharks to promote efficient conservation. In this study, we assembled a database of weekly sightings to describe temporal (seasonal) patterns in the presence of elasmobranchs within an urban, semi-enclosed, landscape (Las Canteras beach, Gran Canaria Island, eastern Atlantic). Data also provided insight into their habitat use and population structure. From October 2015 to October 2018, eight species, either endangered or “data deficient” according to the IUCN red list, were reported, including: the common eagle ray, Myliobatis aquila, the common stingray, Dasyatis pastinaca, the round stingray, Taeniurops grabatus, the spiny butterfly ray, Gymnura altavela, the bull ray, Aetomylaeus bovinus, the angel shark, Squatina squatina, the marbled electric ray, Torpedo marmorata and the hammerhead shark, Sphyrna zygaena. All species were predominantly observed at night. The species varied in their habitat use; D. pastinaca, G. altavela and S. squatina dominated in sandy and mixed bottoms, while M. aquila and T. grabatus were mostly found in rocky and mixed bottoms. Both D. pastinaca and T. grabatus did not show any seasonal pattern, with consistent records all year around. In contrast, M. aquila, G. altavela and S. squatina showed some degree of seasonality. For five species, small-sized individuals were observed. If semi-enclosed embayments at oceanic islands, under intense human presence, are used by juveniles of endangered rays and sharks, proper management, e.g. limitation of putative human interactions, need to be considered to avoid disturbances.

迫切需要提供更多有关射线和鲨鱼的生物学数据，以促进有效的保护。在这项研究中，我们收集了每周观测的数据库，以描述在半封闭的城市景观（拉斯坎特拉斯海滩，大加那利岛，东大西洋）中存在弹枝的情况下的时空（季节）模式。数据还提供了有关其栖息地利用和人口结构的见识。2015年10月至2018年10月，据IUCN红色名录报道了8种濒危或“数据不足”的物种，其中包括：普通鹰，Myliobatis天鹰座，普通黄貂鱼，Dasyatis pastinaca，圆形黄貂鱼，Taeniurops抓，多刺的蝴蝶射线，Gymnura altavela，公牛射线，Aetomylaeus bovinus，天使鲨，Squatina squatina，大理石花纹的射线，鱼雷marmorata和双head鲨，Sphyrna zygaena。主要在晚上观察到所有物种。该物种的栖息地用途各不相同；D. pastinaca，G. altavela和S. squatina沙质和混合塔底为主，而M.天鹰和T. grabatus在岩石和混合塔底大多发现。无论D. pastinaca和T. grabatus没有表现出任何的季节性模式，用一致的记录常年。相比之下，天鹰座，G。altavela和S. squatina表现出一定程度的季节性。对于五个物种，观察到小型个体。如果濒临灭绝的射线和鲨鱼的少年在人类强烈存在下使用大洋岛屿上的半封闭掩体，则应考虑采取适当管理措施，例如限制假定的人类互动，以免造成干扰。