Mutation Fish has been catching plenty of attention, so we put it through its paces to see how it really holds up. Developed by BT Gaming, Mutation Fish arrives with a medium low volatility profile and a published RTP of 96.32%. The maximum win sits at 5,000x, so there's serious upside on the table. Expect a hit frequency around 30%, which sets the rhythm of play. You get 15 paylines across 5 reels, all wrapped in polished, characterful visuals. The full verdict is below.
Written by James Holloway · Last updated: March 2026
At its core, Mutation Fish is a release produced by BT Gaming, finished with a clean, modern look. It runs on 15 paylines across 5 reels with medium low volatility, and an RTP of 96.32%.
Where Mutation Fish earns its keep is the feature set. Look out for scatter symbols that unlock free spins and extra bonus rounds. Thanks to its medium low variance, wins come often enough to suit casual, lower-risk play. All told, it's a solid entry in the BT Gaming catalogue.
The RTP of 96.32% is right around the industry average of ~96%. This represents a fair return that's in line with what most modern slots offer.
Medium-low volatility offers a good balance of regular wins with occasional larger payouts. Expect frequent hits with modest amounts, suitable for casual players who want low-risk entertainment.
About 1 in 3 spins results in a win. This is a moderate hit frequency that balances win frequency with payout size.
Mutation Fish features scatter symbols that can trigger free spins rounds. Landing the required number of scatter symbols anywhere on the reels activates the free spins feature, giving you extra chances to win without additional bets. During free spins, special modifiers may apply to boost your winning potential.
3.0 / 5 — Good
Mutation Fish by BT Gaming is a solid offering that delivers good entertainment value. The 96.32% RTP combined with medium low volatility creates a well-balanced gaming experience.