They don't. It would be a nice mechanic and buff to people who earn them but at this time they don't.Been wondering if getting the fishing achievements have an effect on getting Roe? If not, then would it not make sense to improve the Roe RNG?
Maybe the caught baits could give a slightly better chance at either catching rare fish or getting Perfect Roe. As it is now they serve no purpose at all. They're just... there. I mean what is the point in them existing if they give nothing over gathered bait?