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Article

A Method to Accurately Estimate Fish Abundance in Offshore Cages

Gwangju Institute of Science and Technology, Gwangju 61005, Korea
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Appl. Sci. 2020, 10(11), 3720; https://doi.org/10.3390/app10113720
Received: 24 April 2020 / Revised: 22 May 2020 / Accepted: 25 May 2020 / Published: 27 May 2020
(This article belongs to the Collection Fishery Acoustics)
Due to the lack of reliable methods, manual fish counting is popular on farms. However, this approach is time and labor intensive. Using an echosounder and the echo-integration technique could be a better alternative. The echo-integration method has been widely used in fish abundance estimation in waterbodies because of its simplicity. However, most of the research is concentrated on the open ocean, whereas fish count estimation in farming cages has not been explored much. Using the echo-integration method in a cage offers its own unique sets of problems. Firstly, the echo signal reflected from the cage boundaries should also be taken into account. Secondly, the fish inside a cage behave differently with time, as their mobility pattern is highly dependent on sunlight and water current. In this paper, fish behavior inside an offshore cage over time was extensively studied, and based on that a real-time fish counter system using a commercial echosounder was developed. The experiments demonstrate that our method is simple, user-friendly, and has an estimation error of less than 10%. Since our method accurately estimated fish abundance, the method should be reliable when making fish management decisions. View Full-Text
Keywords: echo-sounder; fish farming; net; fish abundance estimation; fishery acoustic echo-sounder; fish farming; net; fish abundance estimation; fishery acoustic
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MDPI and ACS Style

Sthapit, P.; Kim, M.; Kim, K. A Method to Accurately Estimate Fish Abundance in Offshore Cages. Appl. Sci. 2020, 10, 3720. https://doi.org/10.3390/app10113720

AMA Style

Sthapit P, Kim M, Kim K. A Method to Accurately Estimate Fish Abundance in Offshore Cages. Applied Sciences. 2020; 10(11):3720. https://doi.org/10.3390/app10113720

Chicago/Turabian Style

Sthapit, Pranesh, MinSeok Kim, and Kiseon Kim. 2020. "A Method to Accurately Estimate Fish Abundance in Offshore Cages" Applied Sciences 10, no. 11: 3720. https://doi.org/10.3390/app10113720

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