Work

Hovering in turbulent rock‐array microhabitats: Multidimensional kinematic responses of S chizothorax grahami

Year: 2026

Type: article

Abstract: The interaction between flow and riverbed structures creates spatially heterogeneous turbulent microhabitats that influence fish station‐holding strategies and energy allocation. This study investigated the hovering behaviour of Schizothorax grahami in complex turbulent microhabitats formed by rock arrays of different scales using flume experiments. Video analysis and data storage tag (DST) tilt sensors were combined to quantify five multidimensional kinematic indicators: ground swimming speed (), angular velocity of swimming direction (), tail‐beat angular velocity (), pitch angular velocity () and roll angular velocity (). As rock‐element size increased, fish hovering positions shifted from dispersed distributions to regions with local velocity gradients around rock elements, with clear positional overlap observed under some large‐rock‐array conditions. Increasing discharge generally increased the mean values and standardized within‐condition variances of most kinematic indicators. Trial‐level Spearman correlation analysis showed that had the strongest positive correlation with . Generalized linear mixed models further revealed functional differentiation among kinematic responses: and were mainly driven by flow velocity () and turbulent kinetic energy, whereas , and showed weaker hydrodynamic responses. These findings suggest that fish hovering is an active multidimensional regulation process in which position maintenance, directional correction, propulsion and postural stabilization show partially differentiated response patterns. These findings provide new insights into the locomotor and postural strategies that enable benthic fish to maintain stability in heterogeneous turbulent environments and improve our understanding of fish behavioural adaptation to complex flows.

Source: Journal of Fish Biology

DOI: 10.1111/jfb.70708

Authors: Biao Wang, Hongze Li, Xiaogang Wang, Huijuan Chen

Institutions: Hohai University, Chinese Academy of Sciences, Nanjing Hydraulic Research Institute, Institute of Hydroecology, Jiangsu Ocean University

Language: English

Topic: Fish Ecology and Management Studies

Subfield: Nature and Landscape Conservation

Field: Environmental Science

Domain: Physical Sciences

Open Access status: bronze

Funders: Nanjing Hydraulic Research Institute, National Key Research and Development Program of China

Awards: G1667322359, G6613623073, G729992911