Anise is what I use but I have also caught fish using salmon egg and shrimp scents. I prefer anise because when it gets on your fingers/cloaths/reel/vest/wadder/anything you touch it dose not smell bad. But it's like Bustinbug said, the type usually dose not matter buy covering up your scent dose.
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They say that the man that gets a Ph.D. is the smart one. But I think that the man that learns how to get paid to fish is the smarter one.