Ganaraska is not a particularly big river but has been known for its large fish, one of which held the Ontario steelhead record with its 29Lbs+. In recent years runs have declined but the river still receives plenty of fish in spring. Fishing begins in late August to early September when rains bring schools of chinook from the lake. First fish are aggressive and will take fish eggs, plugs or smaller spoons. Steelhead fishing is done in spring after the trout opener (the last Saturday in April). On the Friday before the opening day a lot of anglers swarm on the little community of Port Hope, starting their day of fishing with luminescent flaots at 12 o'clock at night, once a gun shot is fired. Fishing at night can be quite hectic ; lines are being tangled, and fish are being broken off.
By dawn on the opening day most fish are already spooked and hard to catch. Fishing pressure can be excessive in the areas both south and North of Corbett dam with many anglers cris-crossing the river.
The prefered method on this river is floatfishing with roe since the river forms narrow channels on its flat and shallow bottom. Fly fishing or spin casting with smaller lures will also be productive. Fishing pressure drops significantly after the opener and on some years there are still many steelhead in the river to be caught.