[SnowmanDK]

For now I have ended up with this (a kind of a mix):

local FoulBaitLeft, FoulSBaitLeft, RiverBaitLeft, RiverSBaitLeft = 0, 0, 0, 0
    local OceanBaitLeft, OceanSBaitLeft, LakeBaitLeft, LakeSBaitLeft = 0, 0, 0, 0
    local GeneralBait = 0
    if DestinationsSV.filters[PINS_FISHING_SHOW_BAIT_LEFT] then
        local lureIndex = GetFishingLure()
        local numLures = GetNumFishingLures()
        for lureIndex=1, numLures do
            local name, icon, stack, _, _  = GetFishingLureInfo(lureIndex)
            if     string.find(icon, "centipede") then  --Crawlers
                FoulBaitLeft = stack
            elseif string.find(icon, "fish_roe") then   --Fish Roe
                FoulSBaitLeft = stack
            elseif string.find(icon, "torchbug") then   --Insect Parts
                RiverBaitLeft = stack
            elseif string.find(icon, "shad") then   --Shad
                RiverSBaitLeft = stack
            elseif string.find(icon, "worms") then  --Worms
                OceanBaitLeft = stack
            elseif string.find(icon, "fish_tail") and not (string.find(name, "simple") or string.find(name, "einfacher") or string.find(name, "appât")) then    --Chub
                OceanSBaitLeft = stack
            elseif string.find(icon, "guts") then   --Guts
                LakeBaitLeft = stack
            elseif string.find(icon, "river_betty") then    --Minnow
                LakeSBaitLeft = stack
            elseif string.find(icon, "fish_tail") and (string.find(name, "simple") or string.find(name, "einfacher") or string.find(name, "appât")) then    --Simle Bait
                GeneralBait = stack
            end
        end
    end

The reason for name comparison is that I found out that Chub and Simple Bat use the same icon.
Testing it right now
Edit: I am slow too lol