The Fish Index is one of the most important long term progression systems in My Fishing Brainrots Roblox, yet most players barely pay attention to it. That is a mistake.
Fish Index bonuses are permanent cash multipliers that stay with you forever, even after rebirths, and they stack with every other bonus in the game.
This guide explains what the Fish Index is, how it works, all rewards, and the best strategies to fill it quickly so you can scale your income far faster than players who ignore it.
What Is the Fish Index in My Fishing Brainrots
The Fish Index tracks every unique fish type your brainrots have ever caught.
- Each new fish type is permanently logged
- Milestones unlock permanent cash bonuses
- Bonuses persist through rebirths
- Bonuses stack with rebirth multipliers
Once a fish is registered in your index, it is unlocked forever. You never lose progress.
This makes the Fish Index the foundation of efficient late game grinding.
Fish Index Rewards and Permanent Bonuses
Every milestone increases your cash income permanently.
| Fish Types Collected | Reward | Total Bonus |
|---|---|---|
| 10 | +10% cash | 10% |
| 25 | +15% cash | 25% |
| 50 | +25% cash | 50% |
| 75 | +25% cash | 75% |
| 100 | +25% cash | 100% |
At 100 fish types, you earn double cash forever. Even without rebirths, this is a massive advantage.
How Fish Are Caught
Fish are caught automatically by your brainrots. You do not manually fish.
What affects fish quality
- Brainrot rarity
- Brainrot level
- Global Fishing Luck upgrades
- Time and conditions
You cannot force a specific fish. Instead, you influence probabilities by improving your setup.
Fish Rarity Tiers Explained
Fish have their own rarity tiers, and each tier requires stronger brainrots.
| Fish Rarity | Required Brainrot | Difficulty |
|---|---|---|
| Common | Any | Very easy |
| Uncommon | Any | Easy |
| Rare | Rare or higher | Moderate |
| Epic | Epic or higher | Hard |
| Legendary | Legendary or higher | Very rare |
| Mythic | Mythic | Extremely rare |
If you are missing high tier fish in your index, the issue is usually brainrot rarity, not bad luck.
Best Ways to Fill the Fish Index Faster
Focus on Diversity Not Just Power
Many players make the mistake of running only their strongest brainrots.
Different brainrots catch different fish pools. If your base is full of identical Legendaries, you will keep catching the same fish repeatedly.
A mixed setup fills the index faster.
Keep One of Each Brainrot Type
When you hatch a new brainrot, keep it even if it feels weak.
That random Rare or Epic might catch a fish your Legendary cannot.
You can replace Commons later. Early and mid game diversity is more important than raw income.
Upgrade Global Fishing Luck First
Fishing Luck upgrades affect all brainrots at once.
- Priority for Fish Index grinding
- Fishing Luck upgrades
- Brainrot variety
- Individual brainrot upgrades
Fishing Luck is the single biggest accelerator for rare fish entries.
Watch for Time Based Fish
Some fish only appear under specific conditions.
Possible requirements include
- Day only fish
- Night only fish
- Weather based fish
- Event exclusive fish
If your index is stuck, check which fish are missing. You may simply be playing at the wrong time.
Fish Index Completion Strategy by Phase
Early Game 0 to 25 Fish
This phase completes naturally.
- Play normally
- Fill brainrot slots
- Do basic upgrades
You will reach 25 fish types without trying.
Mid Game 25 to 50 Fish
Rare fish start mattering.
- Hatch Rare and Epic brainrots
- Avoid deleting unique types
- Invest heavily in Fishing Luck
This is where most players slow down.
Late Game 50 to 75 Fish
Legendary fish appear.
- Run multiple Legendary brainrots
- Max Fishing Luck upgrades
- Play during different time cycles
Patience becomes important here.
Endgame 75 to 100 Fish
This is the true grind.
- Mythic brainrots are required
- Event fish become critical
- Some fish are extremely rare
Missing events can delay full completion significantly.
Fish Index and Rebirth Explained
Fish Index progress is completely permanent.
When you rebirth
- Brainrots reset
- Cash resets
- Fish Index stays untouched
This means rebirthing early without filling your index slows long term progress.
Smart Pre Rebirth Strategy
Before rebirthing
- Check missing fish in your index
- Hatch diverse brainrots to fill gaps
- Wait until you hit the next milestone
- Then rebirth
Never rebirth at 48 fish types when 50 gives a permanent bonus.
How Fish Index Multipliers Stack
Fish Index bonuses multiply with rebirth bonuses.
| Setup | Total Multiplier |
|---|---|
| No index no rebirth | 1x |
| 50% index no rebirth | 1.5x |
| No index 3 rebirths | 2x |
| 50% index 3 rebirths | 3x |
| 100% index 5 rebirths | 6x |
This is why high level players earn absurd money. They optimized both systems.
Common Fish Index Mistakes
- Ignoring the Fish Index entirely
- Deleting unique brainrots too early
- Only playing at one time of day
- Rebirthing before milestone rewards
- Skipping limited time events
Avoiding these mistakes saves hours of grinding.
Event Fish and Limited Time Progress
Seasonal events introduce exclusive fish.
- Christmas events
- Halloween events
- Anniversary events
Event fish count toward your index. Missing them can permanently slow completion unless they return.
Final Thoughts
The Fish Index is not optional progression. It is the backbone of efficient scaling in My Fishing Brainrots. Players who invest early into index completion will always outpace players who rush rebirths without planning.
If you want smoother progress, higher income, and less grinding over time, prioritize your Fish Index before anything else.
Nishant Singh is a gaming writer with a passion for Roblox and the Call of Duty franchise. He enjoys exploring new titles, sharing tips, and writing stories that bring the gaming world to life.