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The effect of brown kelp phenology on abalone locomotion and spatial distribution: acoustic telemetry and spatially explicit individual-based model approach

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Abstract

In field studies of a species’ population size, the movement and distribution of the target organism beyond the study area affect the population size estimate. Estimates are derived based on the number of animals caught, and catch efficiency changes with distribution and locomotion of the animals. This study, using acoustic telemetry and unmanned aerial vehicle (UAV) mapping, revealed that the Ezo abalone, Haliotis discus hannai, alters its distance moved depending on its distance from brown kelp. In addition, we reproduced abalone locomotion and brown kelp phenology as individual-based models. In the model, abalone moved to deeper water during the spring/summer brown kelp growing season, while during autumn/winter, the model showed them moving to shallower water and aggregating around the remaining brown kelp. The timing of moving to shallower area in the model coincided with the fishing season. Fishers mainly catch abalone in shallower areas. Therefore, it is possible that fishing efficiency will not decline later in the fishing season because fishers can catch the abalone immigrating to the main fishing grounds and those aggregating around the brown kelp. Our model indicated the need for improvement in the DeLury method and the catch per unit effort (CPUE) trends used in the abalone fishing industry.

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Acknowledgements

Dr. Jun Hayakawa, Mr. Masaaki Hirano, Mr. Takanori Suzuki and Mr. Nobuhiko Iwama of Tokyo University helped us carry out the field research. Dr. Kousuke Yatsuya gave insightful comments and suggestions. We thank Ms. Fukumi Tashiro for her help in preparing for the field research. Mr. Yuichi Kohsaka, Mr. Ryoji Ushirokawa, Mr. Katsutoshi Sasaki and Mr. Nao Kimura from Omoe Fisheries Cooperative Association gathered data on their fishing activities. This work was supported by the JSPS KAKENHI (19K06217), Tohoku Ecosystem Associated Marine Sciences, Crest (JPMJCR13A5) and the Cooperative Program (No. 117, 2019) of Atmosphere and Ocean Research Institute, The University of Tokyo.

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Japan Society for the Promotion of Science, 19K06217, Yukio Matsumoto, Core Research for Evolutional Science and Technology, JPMJCR13A5, Yukio Matsumoto.

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Correspondence to Yukio Matsumoto.

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Matsumoto, Y., Takami, H. The effect of brown kelp phenology on abalone locomotion and spatial distribution: acoustic telemetry and spatially explicit individual-based model approach. Fish Sci 88, 693–701 (2022). https://doi.org/10.1007/s12562-022-01640-y

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  • DOI: https://doi.org/10.1007/s12562-022-01640-y

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