Population suppression of the invasive channel catfish Ictalurus punctatus in the Seta River, outflowing from Lake Biwa, Japan

January 1, 2026NIPPON SUISAN GAKKAISHIOpen Access

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Key Points

The aim is to evaluate the effectiveness of fishing techniques in suppressing invasive channel catfish populations in the Seta River.
Conducted concentrated removal using longlines in the Seta River, downstream from Lake Biwa.
Monitored catch rates over time to assess the removal effectiveness.
Analyzed annual recruitment of juvenile catfish to determine changes in population dynamics.
Out of monitoring periods, no catches were recorded in certain instances, indicating variability in catch efficiency.
Annual recruitment rates of juvenile catfish have shown a decreasing trend, suggesting effective population suppression by the longline method.

This randomized trial demonstrates population suppression of invasive channel catfish in the Seta River, suggesting effective management strategies.

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Ishizaki et al. (2026) studied this question.

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