Deep learning for automated analysis of fish abundance: the benefits of training across multiple habitats

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Ditria, Ellen M
Sievers, Michael
Lopez-Marcano, Sebastian
Jinks, Eric L
Connolly, Rod M
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Environmental monitoring guides conservation and is particularly important for aquatic habitats which are heavily impacted by human activities. Underwater cameras and uncrewed devices monitor aquatic wildlife, but manual processing of footage is a significant bottleneck to rapid data processing and dissemination of results. Deep learning has emerged as a solution, but its ability to accurately detect animals across habitat types and locations is largely untested for coastal environments. Here, we produce five deep learning models using an object detection framework to detect an ecologically important fish, luderick (Girella tricuspidata). We trained two models on footage from single habitats (seagrass or reef) and three on footage from both habitats. All models were subjected to tests from both habitat types. Models performed well on test data from the same habitat type (object detection measure: mAP50: 91.7 and 86.9% performance for seagrass and reef, respectively) but poorly on test sets from a different habitat type (73.3 and 58.4%, respectively). The model trained on a combination of both habitats produced the highest object detection results for both tests (an average of 92.4 and 87.8%, respectively). The ability of the combination trained models to correctly estimate the ecological abundance metric, MaxN, showed similar patterns. The findings demonstrate that deep learning models extract ecologically useful information from video footage accurately and consistently and can perform across habitat types when trained on footage from the variety of habitat types.

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Environmental Monitoring and Assessment
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© 2020 Springer Netherlands. This is an electronic version of an article published in Environmental Monitoring and Assessment, 2020, 192 (11), pp. 698. Environmental Monitoring and Assessment is available online at: with the open URL of your article.
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Environmental sciences
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Life Sciences & Biomedicine
Computer vision
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Ditria, EM; Sievers, M; Lopez-Marcano, S; Jinks, EL; Connolly, RM, Deep learning for automated analysis of fish abundance: the benefits of training across multiple habitats, Environmental Monitoring and Assessment, 2020, 192 (11), pp. 698