Fishing is full of rules that anglers swear by, and many do not hold up. Some come from a grain of truth stretched too far, and others are simply repeated at the dock until everyone believes them. Fishing magazines, guides and outdoor sites regularly debunk the same handful, and the five below are the ones that came up most in published coverage. Fish behavior varies by species, water and season, so these are general points, not laws of nature. Where sources disagree, the entries say so. The best fishing knowledge comes from time on the water, a notebook and an open mind. If a rule has not worked for you, trust your own observations over the story told in the bait shop.
Many anglers swear that fish bite when the barometer drops. There is a grain of truth, but the picture is more complex. One source says pressure changes can affect feeding, but the real driver is that they signal shifts in weather, light and humidity that insects respond to, which in turn draws fish to feed. Another notes that it is true that changes in barometric pressure may affect the bite, but rain falling on the surface does not by itself switch fish on or off. Treat pressure as a clue about changing conditions, not a guarantee. Watch for activity on the water, such as insects, baitfish and birds. Fish when you can and pay attention to what you see.
The idea that a larger lure catches a larger fish has some basis, and it can mislead you. One source puts it fairly: big fish can eat bigger bait than smaller fish can, but that doesn't mean it is their habit to do so. Large fish are often efficient feeders that take whatever is easy and abundant, which may be small prey. In some situations, a big lure catches a trophy, and in others a small presentation draws more strikes. Match your lure to what the fish are eating and the conditions. Carry a range of sizes and change them if the fish are not responding. Experiment with presentation, color and action before you assume bigger is better.
Anglers talk about dawn and dusk bites as if the clock controlled the fish. One angler says it is not the time of day that makes a trout want to eat, but the water temperature. Trout are cold-water fish, and they feed most actively within a comfortable temperature range. In summer, that may mean early morning and evening when water is coolest. In spring and fall, midday can be the best time. Carry a thermometer and check the water. Hatches of insects also trigger feeding, and those follow temperature and light. If you see rising fish, it does not matter what the clock says. Fish the conditions, not the schedule.
Catfish have a reputation as night feeders, and anglers often assume they cannot be caught in daylight. One source says catfish can be caught regardless of the time of day or season, and that they feed during all hours, even during the day. Night can be productive, especially in clear, shallow water or in summer heat, but daytime fishing works too, particularly in deeper holes, cloudy water or around cover. Use strong-smelling baits, cut bait or live bait, and fish near structure like logs, ledges and channel edges. Don't skip a good afternoon because of a rule. If you only fish at night, you may miss productive hours.
Two noisy myths travel together. One source says fish aren't likely to swim away based on conversation or music alone, since airborne sound does not carry well into the water. The bigger problem is vibration, such as dropping a tackle box, stomping on a hull or banging a cooler lid, which travels through the boat and into the water. Another source says trolling motors aren't silent underwater, since there is some level of audible noise whenever a propeller is spinning. Fish in clear, shallow water may be wary of any disturbance. Move calmly, set equipment down gently and keep your approach quiet. Relax and talk with your fishing partner, but handle gear with care.