An angler's unexpected catch in Island Park Reservoir sparks concern over ecological impact. On January 3, 2026, an angler ice fishing for trout made a surprising discovery: a 5-inch-long Yellow Perch, an invasive species not native to the reservoir. The angler promptly reported the catch to the Citizens Against Poaching hotline, leading to a swift response from the Idaho Department of Fish and Game (IDFG).
Conservation Officers confirmed the catch and identified it as a Yellow Perch, a species not typically found in the area. This discovery raises alarm as it indicates illegal stocking, which can have severe ecological consequences for Idaho's fishery resources. The IDFG emphasizes that transporting live fish without permits is illegal and can result in significant financial restoration costs, potentially reaching hundreds of thousands of dollars. Moreover, individuals responsible for illegal fish introductions may face felony charges.
Brett High, Fisheries Manager, expresses concern about the potential impact of Yellow Perch on the reservoir's trout population. Trout, Idaho's most popular fish species, rely on small crustaceans called zooplankton for food. Yellow Perch, also a popular sportfish, feed on the same zooplankton, often leading to competition and poor survival for trout. High notes that the illegal introduction's effects on ongoing efforts to improve water quality and the fishery are unknown but potentially detrimental.
To address this issue, Fish and Game encourages anglers to harvest all Yellow Perch caught in Island Park Reservoir, with no bag limits or size restrictions. Conservation Officers, despite their best efforts, cannot be everywhere, so the public's vigilance is crucial. If anyone witnesses live fish transportation or other wildlife violations, they are urged to call the Citizens Against Poaching hotline at 1-800-632-5999, remaining anonymous and potentially eligible for rewards.
This incident highlights the importance of responsible angling practices and the need to protect Idaho's natural resources. As the investigation continues, the IDFG will monitor fish populations and the potential impact of Yellow Perch, ensuring the reservoir's ecosystem remains healthy and sustainable.
