An angler's unexpected catch in Island Park Reservoir sparks ecological concerns
An angler ice fishing for trout on Island Park Reservoir on January 3, 2026, made a surprising discovery. Instead of the expected trout, they hooked a 5-inch-long Yellow Perch, a species not native to the reservoir. The angler promptly reported the catch to the Citizens Against Poaching hotline, leading to a significant ecological concern.
Conservation Officers from the Idaho Department of Fish and Game confirmed the catch and identified it as a Yellow Perch. With no known Yellow Perch fisheries in the area, this discovery indicates illegal stocking, posing a serious threat to the reservoir's ecosystem. Island Park Reservoir is primarily managed as a hatchery-supported Rainbow Trout fishery.
The illegal transportation and stocking of live fish in Idaho are strictly prohibited without the necessary permits. Such actions can have severe ecological consequences for Idaho's fishery resources. Those found responsible for illegally introducing fish into new habitats may face legal repercussions, including the financial burden of restoring the affected area to its original state. Restoration efforts can cost hundreds of thousands of dollars and even result in felony charges.
Brett High, Fisheries Manager, expressed concern about the potential impact of the Yellow Perch on the reservoir's trout population. Trout, Idaho's most popular fish species, feed on small crustaceans known as zooplankton in Idaho's reservoirs. Perch, another popular sportfish, share the same dietary preferences. While they can sometimes coexist, perch often outcompete trout, leading to poor survival and growth rates. The extent of this illegal introduction's impact on ongoing efforts to improve water quality and the fishery in Island Park Reservoir remains uncertain and alarming.
Fish and Game is urging anglers to harvest any Yellow Perch they encounter in Island Park Reservoir, with no bag limits or size restrictions. Conservation Officers, despite their best efforts, cannot be present everywhere at once. Anglers are encouraged to report any instances of live fish transportation or wildlife violations to the Citizens Against Poaching hotline at 1-800-632-5999. Callers can remain anonymous and may be eligible for rewards.
This incident highlights the critical need for vigilance in protecting Idaho's natural resources. Anglers and the public are encouraged to report any suspicious activities to help preserve the ecological balance of Island Park Reservoir.
