Best High-RTP Fishing Slots UK: Big Bass, Fishin' Frenzy & More

Why Fishing Slots Dominate UK Online Gambling

Fishing slots are the single most popular themed category in the UK online slot market. Across most major UK operators, at least one Big Bass or Fishin' Frenzy variant sits inside the top ten most-played titles by spin volume in any given month. The combination of accessible visuals, a clear collect-the-fish bonus mechanic, and aggressive franchise expansion has turned fishing into a category that now spans dozens of titles across multiple providers.

The two dominant franchises are Pragmatic Play's Big Bass series and Blueprint Gaming's Fishin' Frenzy series. Together they account for the majority of fishing-themed spin volume in the UK. A scattered long tail of single titles from other providers — Reel Kingdom, NetEnt, Inspired, Eyecon, IGT — fills out the category. This guide ranks the major titles by published theoretical RTP and explains the deployment dynamics that determine what you actually play at your casino.

The Big Bass Family Ranked by RTP

Pragmatic Play's Big Bass series is the highest-RTP fishing franchise on average. Most entries publish at 96.45% theoretical, with one notable outlier at the top.

Big Bass Splash is the highest at 96.71% theoretical. The added split-symbol mechanic and money fishermen create a slightly higher mathematical ceiling than the original line.

Big Bass Bonanza, the original, sits at 96.45% theoretical. Big Bass Bonanza 1000 also publishes at 96.45%. Bigger Bass Bonanza publishes at 96.45%. Big Bass Bonanza Keeping it Reel publishes at 96.45%.

All Big Bass titles use Pragmatic Play's standardised 3-tier deployment system: typically 96.71% / 96.45% / 95.50% / 91.50% / 87% depending on the title's tier set. The casino selects which tier to deploy. On the maths alone, Big Bass Splash at theoretical-tier deployment is the strictly best choice in the franchise. See Pragmatic Play's provider profile for the full tier architecture.

The Fishin' Frenzy Family Ranked by RTP

Blueprint Gaming's Fishin' Frenzy series is the older of the two flagship franchises and the originator of the modern fisherman-collect mechanic. The titles publish at slightly lower theoretical RTPs than Big Bass equivalents.

Fishin' Frenzy (the original) publishes at 96.12% theoretical — the highest in the franchise. Fishin' Frenzy Even Bigger Catch publishes at 95.80%. Fishin' Frenzy The Big Catch publishes at 95.16%. Fishin' Frenzy Megaways publishes at 95.02%, the lowest of the major variants in the franchise.

Blueprint Gaming uses per-game variable tiers rather than a standardised system. Each Fishin' Frenzy title has its own tier set, and casinos can deploy at any of the available configurations. The original at 96.12% theoretical is the franchise's best mathematical proposition before deployment effects. See Blueprint Gaming's provider profile for the full tier architecture.

Big Bass vs Fishin' Frenzy: The Cross-Franchise Comparison

On published theoretical RTP, Big Bass beats Fishin' Frenzy across the board. The flagship Big Bass Splash at 96.71% beats the flagship Fishin' Frenzy at 96.12% by 0.59 percentage points. The standard Big Bass Bonanza at 96.45% beats Fishin' Frenzy The Big Catch at 95.16% by 1.29 percentage points. The pattern holds across every comparable pair.

However, theoretical RTP is only the published maximum. Both franchises use variable-tier deployment, and the actual deployed RTP at your casino depends on the operator's selection. A theoretical-tier Fishin' Frenzy can outperform a low-tier Big Bass at the same casino. The cross-franchise comparison only holds at the same deployment tier.

For RTP-conscious players, the practical workflow is: check the deployed RTP on both franchises at your specific casino, choose the higher-deployed title regardless of franchise, and use the RTP checker to verify before playing. See how casinos change RTP for the deployment mechanism behind both franchises.

How the Collect Mechanic Works

Both franchises share a core mechanic: during free spins, fisherman or angler symbols act as wilds that 'collect' the value of any fish symbols visible on the reels at the same time. The collected fish values are added to your win for that spin. Trigger more scatters during the bonus and you typically retrigger free spins or upgrade the multiplier on the fisherman.

Big Bass titles add multiplier fishermen in later entries — when a fisherman lands during free spins, it collects all visible fish at a multiplier (×2, ×3, ×10) which scales with the number of fishermen on screen. Big Bass Splash extends this with money fishermen that pay fixed amounts. The multiplier escalation is the key reason Big Bass titles produce larger maximum-win sequences than Fishin' Frenzy equivalents.

Fishin' Frenzy adds expanded reels in Megaways versions — the standard 5-reel layout becomes a 6-reel Megaways grid with up to 117,649 ways. The bonus mechanic adapts: fishermen still collect fish, but across a larger and more variable reel structure. The volatility profile is higher than the standard Fishin' Frenzy.

Both franchises produce similar player experiences in their base games — fish symbols paying fixed values, occasional scatter triggers — and diverge in the bonus rounds. Big Bass tends to feel more rewarding on bonus hits; Fishin' Frenzy tends to trigger bonuses more frequently in the original (slightly higher hit rate at lower volatility).