Impact of Multiple Water Temperature Structures on the Behavioral Pattern of Chum Salmon (Oncorhynchus keta) on the Coast of the Shiretoko Peninsula

Chum salmon (Oncorhynchus keta) migrating to the Shiretoko Peninsula, Japan, exhibit distinct behavioral adaptations to complex water temperature structures formed by coastal currents. The study found that these fish actively avoid thermoclines—zones of rapid temperature decline—and instead prefer swimming in stable surface or deep layers (210–230 m). This preference suggests a sophisticated response to vertical temperature gradients, offering new insights into the behavioral ecology of homing salmon. Researchers used continuous tracking and vertical profiling data collected in 2012 and 2013 to document these patterns. The findings highlight the importance of understanding environmental factors in developing sustainable management strategies for salmon populations.

Li, X., Yamaguchi, H., Shirakawa, H., Minami, K., Sato, N., Zhu, Y., Miyakoshi, Y., & Miyashita, K. (2023). Impact of Multiple Water Temperature Structures on the Behavioral Pattern of Chum Salmon (Oncorhynchus keta) on the Coast of the Shiretoko Peninsula. Journal of Marine Science and Technology, 31(4). https://doi.org/10.51400/2709-6998.2721