Our review of Big Fish Bonanza cuts through the marketing and looks at what matters: how it plays and how it pays. This is a ESA Gaming slot, sitting firmly in the a medium high-variance maths model bracket and paying back a return-to-player rate of 95.99%. It's wrapped in a fish theme and plays out on 10 paylines across 5 reels. It first went live in 2023 and still earns its place today. If everything lines up, Big Fish Bonanza can pay up to 5,000x your bet. The full verdict is below.
Written by Rachel Kim · Last updated: February 2026
Big Fish Bonanza is a title from ESA Gaming. Presentation-wise it's themed around fish, and it leans toward a medium high volatility profile at 95.99% RTP. Under the hood you'll find a 5-reel grid running 10 paylines.
The medium high volatility strikes a middle ground that should suit most playing styles. On balance, Big Fish Bonanza is a dependable option worth a few spins in the demo first.
At 95.99%, the RTP is slightly below the industry average of ~96%. While this is typical for many popular slots, players should be aware of the slightly lower theoretical return.
Medium-high volatility means wins come less frequently but tend to be larger when they hit. Players should be prepared for dry spells between bigger wins, requiring a moderate bankroll.
About 1 in 3 spins results in a win. This is a moderate hit frequency that balances win frequency with payout size.
3.0 / 5 — Good
Big Fish Bonanza by ESA Gaming is a solid offering that delivers good entertainment value. The 95.99% RTP combined with medium high volatility creates a well-balanced gaming experience.