TROUT PELLETS
Were used quite a lot until it was found that the high oil content if eaten in quantity with little else in the diet) could actually kill the fish. Most places banned them after this, but they are still allowed on some waters, and to good effect as well.
Well there you have it, a quick guide into what baits are catchers and in some cases, how to use them. This is not saying that these are the only baits FULL STOP, far from it. I would say that if you are confident enough, try other baits that other people may not think of. For instance, I know that people have caught carp using such weird and unusual things like banana, pepperami, marshmallow, the list is endless.
These baits are part of the particle family. DO NOT use without preparing them first. ALL particles require some sort of preparation. As a guideline, you may want to check my 'Particle Preperation' article, which can also be found on The Carper's Lodge.