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Besides, https://www.nature.com/articles/s41598-025-04272-1#Sec3

>For rainbow trout, an estimated 10 (1.9–21.7) minutes of moderate to extreme pain (Hurtful, Disabling and Excruciating pain combined) are endured by each trout due to air asphyxia (Fig. 1).

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and that's why things like ikejime are needed. It instantly kills the fish and destroys its nervous system in the same way we do for cattle. It's absolutely unbelievable that it is not a common practice. And it also extends the quality of the fish and the duration for conservation.

I am a freshwater fisherman myself, and I do it on any fish I intend to keep, and release them very quickly otherwise.

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