Hey Gerty,
Not necessarily. Went out last saturday (4/817) and started the morning catching walleye/sauger after walleye/sauger by vertical jigging with jig heads and minnow. Once the sun was high enough everything shut off. Switched to blade baits, rattle, baits, and dragging plastics. Action was still slow. We then started using 3 ways and dubuque rigs and started catching them all over again. The river conditions and the bite can change hourly. Fish are there you just have to find what they are biting depending on the time and conditions. That can mean anything from fishing technique, weight of the bait, bait color, live vs plastic, etc. Water levels, temp, and conditions do play a factor. But if you’re moving around you should be able to get on something. Sometimes it just takes changing up your presentations and experimenting.