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. 2023 Jan 12;13(2):268. doi: 10.3390/ani13020268

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Representative zenithal pictures showing the usual swimming behavior of the rainbow trout (Oncorhynchus mykiss) fingerlings in the control (A,B) and sheltered tanks (C,D). Left panels (A,C) show fish swimming in undisturbed conditions, while panels (B,D) show the typical response of the fish just after disturbance (knocking on the tank wall): Fish tended to get away from the tank walls and group together, and this behavior appeared similar for both control and sheltered tanks. Red circles in (B,D) indicate the knocking spot. See the main text for more details.