Open Access

ARTICLE

FishTracker: An Efficient Multi-Object Tracking Algorithm for Fish Monitoring in a RAS Environment

Yuqiang Wu^1,2, Zhao Ji¹, Guanqi You¹, Zihan Zhang¹, Chaoping Lu³, Huanliang Xu¹, Zhaoyu Zhai^1,*

1 College of Smart Agriculture (College of Artificial Intelligence), Nanjing Agricultural University, Nanjing, 210095, China
2 College of Information Technology, Nanjing Police University, Nanjing, 210023, China
3Yuguanjia (Shanghai) Fisheries Co., Ltd., Shanghai, 202178, China

* Corresponding Author: Zhaoyu Zhai. Email:

Computers, Materials & Continua 2026, 86(2), 1-22. https://doi.org/10.32604/cmc.2025.070414

Received 15 July 2025; Accepted 16 September 2025; Issue published 09 December 2025

Abstract

Understanding fish movement trajectories in aquaculture is essential for practical applications, such as disease warning, feeding optimization, and breeding management. These trajectories reveal key information about the fish’s behavior, health, and environmental adaptability. However, when multi-object tracking (MOT) algorithms are applied to the high-density aquaculture environment, occlusion and overlapping among fish may result in missed detections, false detections, and identity switching problems, which limit the tracking accuracy. To address these issues, this paper proposes FishTracker, a MOT algorithm, by utilizing a Tracking-by-Detection framework. First, the neck part of the YOLOv8 model is enhanced by introducing a Multi-Scale Dilated Attention (MSDA) module to improve object localization and classification confidence. Second, an Adaptive Kalman Filter (AKF) is employed in the tracking phase to dynamically adjust motion prediction parameters, thereby overcoming target adhesion and nonlinear motion in complex scenarios. Experimental results show that FishTracker achieves a multi-object tracking accuracy (MOTA) of 93.22% and 87.24% in bright and dark illumination conditions, respectively. Further validation in a real aquaculture scenario reveal that FishTracker achieves a MOTA of 76.70%, which is 5.34% higher than the baseline model. The higher order tracking accuracy (HOTA) reaches 50.5%, which is 3.4% higher than the benchmark. In conclusion, FishTracker can provide reliable technical support for accurate tracking and behavioral analysis of high-density fish populations.

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Keywords

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Supplementary Material

Supplementary Material File

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