Tool Directory and Where to Use Them
The nine tools fall into three useful groups:
- Showcase fish: Mutation Reroll, Mutation Lock, Size Tonic and Name Tag.
- Fishing and collection: Rarity Lure, Index Compass and Weekly Lure.
- Pets and random rewards: Pet Treat and Mystery Clam.
To buy and use a tool:
- Open Pearl Shop → Tools. Use the All, Showcase, Fishing, Pet & Clams or Unlocks filters to browse.
- Check Today's Deals for a discount on the tool you want, then buy it with Pearls.
- Open Cooler → Other to use the purchased tool when you need it.
Daily offers refresh each day, and each offer can be purchased once per day. A tool can have different discounts on different daily offers, so its deal price is conditional rather than a replacement for its regular price.
Mutation Reroll and Mutation Lock
Mutation Reroll changes a showcase fish's mutation. Its unprotected outcomes are:
| Outcome | Chance |
|---|---|
| Upgrade | 40% overall, including an 8% chance to rise two tiers |
| Stay unchanged | 40% |
| Drop one tier | 20% |
The two-tier outcome is included in the 40% upgrade chance; it is not an extra 8% added on top.
Mutation Lock prevents a downgrade on the next reroll and is automatically consumed by that reroll. It does not guarantee an upgrade or protect a series of rerolls. Treat it as protection for a mutation you want to preserve, rather than an upgrade boost.
Use a Lock when losing the fish's current mutation tier would undermine your goal. An unprotected reroll is a choice to accept the one-tier downgrade risk. For the tier order and other ways to obtain mutations, see the mutation guide.
Size Tonic, Name Tag and Pet Treat
Size Tonic: grow a fish you plan to keep
Each bottle permanently increases one showcase fish's size by 5%–10%, with a maximum of three bottles per fish. Larger fish earn more income, so prioritize a fish you intend to keep in your showcase lineup. The increase varies per bottle; a bottle does not promise the maximum growth.
For help choosing which fish deserves the investment, see showcase fish and income choices.
Name Tag: personalize a showcase fish
Name Tag engraves a name on a showcase fish's pedestal that everyone can see. Choose it when you want to personalize a particular display fish.
Pet Treat: add one level to a selected pet
Open Cooler → Other, use Pet Treat, and select the pet you want to level. It adds one level, up to Level 10. Spend it on a pet you plan to use and that is still below the cap. Compare pet abilities and other leveling options in the pet guide.
Choose Rarity Lure, Index Compass or Weekly Lure
These tools solve different fishing goals:
| Your goal | Tool | Effect and condition |
|---|---|---|
| Get extra fish | Rarity Lure | Adds one fish to each of the next three reel-ins. The bonus fish is two rarity tiers below the highest rarity your current net can catch. |
| Fill missing species | Index Compass | For 10 minutes, already-discovered fish sometimes become uncollected species of the same rarity. |
| Target a weekly limited fish | Weekly Lure | Doubles that week's limited fish catch chance for 15 minutes, during a week with a limited fish available. |
Choose Rarity Lure when the bonus rarity is useful to you. Its value depends on your current net's catch limit: it supplies extra catches below that limit, so it is a poor match if your sole goal is a fish at the net's highest catchable rarity.
Choose Index Compass when familiar catches are slowing collection progress. It targets missing species within the same rarity, making it the better fit for filling gaps rather than seeking a higher rarity. Use the Fish Index to identify the species you still want.
Choose Weekly Lure for a specific weekly target. Save it when no weekly limited fish is available. Activate either timed tool when you are ready to spend its active duration fishing.
Mystery Clam Rewards and Spending Choice
Mystery Clam can award Pearls, bait, a pet crate, lures, locks, or a 150-Pearl jackpot. Open Pearl Shop → Tools to view its reward odds.
It costs 600 Pearls at regular price. Different daily offers can reduce that to 450 Pearls at 25% off or 390 Pearls at 35% off. The named 150-Pearl jackpot is smaller than any of those purchase prices, so that reward alone does not repay the purchase.
Buy Mystery Clam when you want a random reward from its pool. If you need a particular effect—such as protecting a reroll or leveling a pet—buying the corresponding tool directly gives you control over what you receive.
For broader progression, compare a targeted tool purchase with a permanent Charm in the Pearls and Pearl Shop guide. If neither helps an immediate goal, saving your Pearls is reasonable; Pearls survive Rebirth.
