Research on abundance and composition of fish assemblages surrounding offshore extraction platforms is essential to evaluate their impact as well as to understand relationships between natural and artificial habitats. Also decommissioning practice, which belongs to the lifecycle of these structures, can be encouraged or discouraged if fish school behaviour in the close proximity of the platform is well understood. With thousands of platforms to be decommissioned around the world in coming decades, understanding such dynamic interactions is key to improve spatial management of marine ecosystems.

In this context, this study drafts a work plan that can be used to investigate fish presence and abundance, school movement and qualitative species composition around a platform over long time periods. It integrates fishing captures, multibeam echosounder (MBES) investigations, and drop camera shootings to overcome the limitations of the individual methods. Monthly samplings were conducted at a three-leg gas extraction platform placed at ~80 m depth in the central Adriatic Sea, for one year after its installation. MBES completely insonified the studied area, providing data on school shape, volume, surface area and position throughout the water column. Fishing captures were useful for MBES targets' identification by measuring the presence/abundance of nekto-benthic and pelagic species both in the nearby of the structure and in the open sea, while drop camera shootings added evidence of a few species in close proximity to the poles, which were not censused by the other methods. Results underlined the strong attraction exerted by the platform and the significant influence of the explanatory variable distance on the schools’ nominal volume.

对海上采油平台周围鱼群的丰度和组成进行研究对于评估其影响以及了解自然栖息地与人工栖息地之间的关系至关重要。如果很好地了解了平台附近的鱼群行为，则也可以鼓励或劝阻属于这些结构生命周期的退役实践。在未来几十年内，将有数千个平台在全球范围内退役，因此了解这种动态相互作用是改善海洋生态系统空间管理的关键。

在这种情况下，本研究起草了一项工作计划，该计划可用于调查长时间内平台周围鱼类的存在和丰度，学校运动和定性物种组成。它集成了钓鱼捕获，多波束回声（MBES）调查和跌落相机拍摄，从而克服了单独方法的局限性。安装一年后，每月在位于亚得里亚海中部约80 m深度的三腿瓦斯抽采平台上进行采样。MBES完全声调了研究区域，提供了整个水柱中学校形状，体积，表面积和位置的数据。捕捞渔获物通过测量结构附近和公海中的底栖和上层物种的存在/丰度，有助于MBES目标的识别，跌落相机的拍摄则增加了极点附近极少数物种的证据，其他物种并未对此进行过调查。结果强调了平台施加的强大吸引力，以及解释性可变距离对学校名义数量的重大影响。