What to do first
Treat this as a source-watch page, not a fully official zone guide. The public Roblox page confirms a new 0.0009% catch, a hidden quest, and a mysterious island teaser, but it still does not directly name an Extinct Rarity Zone.
For be a fish bait extinct rarity zone, start from the current Delulu Upd patch surface. The safest public read is that players are chasing the new ultra-rare catch and hidden-quest loop, while YouTube and competitor pages are using phrases like Extinct Rarity Zone and last zone before Roblox has published that exact label.
That exact-intent demand is now strong enough to keep this route live as a guarded source-watch page. What this page will not do is invent zone requirements, unlock stats, or a fully official map label that the Roblox description still does not publish.
That means the practical move is simple: redeem current codes, check the official Delulu patch wording, then verify in-game whether your route to the 0.0009% catch involves a zone, quest chain, island unlock, or another trigger. Use this page as the boundary marker so you do not confuse reported zone slang with direct official naming.