Radioactive is still the safest money-first answer
Fresh July 2026 public guides and video discovery keep pointing to Radioactive as the strongest reported single multiplier. That makes it the safest current answer for players who only want the shortest best-mutation-for-money recommendation.
If you searched BE A FISH BAIT best mutation for money, the safest public answer is Radioactive. Current guide consensus still treats it as the strongest reported single multiplier for aquarium earnings.
That does not mean every profitable catch uses the same final setup. Public guides also treat Delulu and Champion as special stackable mutations, so the best late-session outcome can depend on whether your current fish can hold those extra layers.
This page keeps the claim boundary narrow on purpose: it answers the money-angle query directly, but it does not turn one third-party table into a fully official progression bible.