- Fish index overview: The Harpoon a Fish index tracks 1,800+ species across every depth zone
- Core filters: Sort entries by name, rarity, appearance depth, and capture status
- Collection strategy: Work through uncaptured entries by depth range, not by chance encounters
- Growth connection: Eating food to grow larger unlocks the deeper entries your index is missing
- PvP risk: Rare fish attract thieves, so finish captures quickly and avoid open areas
What the Harpoon a Fish Index Does
The fish index is the central collection tracker for Harpoon a Fish, the deep-sea fishing simulator by FirstTry on Roblox. With 1,800+ unique fish to discover, the index turns an overwhelming catalog into an organized bestiary you can search, filter, and complete over time. Every successful catch adds to your recorded collection, and every missing entry becomes a concrete goal rather than a vague hope.
The index is designed around five core data points. Understanding how they interact is the difference between random fishing and efficient collection completion.
| Data Point | What It Shows | How to Use It |
|---|---|---|
| Fish Name | The species entry in the bestiary | Search to check if a new find is already captured |
| Rarity | Common to sea-monster tier | Prioritize uncollected entries in higher rarity groups |
| Appearance Depth | Where the fish can be encountered | Compare with your current growth before targeting |
| Capture Status | Captured or uncaptured flag | Update after each catch to keep progress accurate |
| Collection Progress | Overall completion percentage | Set short-term goals from missing entries |
For New Players
- Focus on starter fish first
- Learn harpoon timing safely
- Build early collection entries
For Mid-Game Players
- Filter by uncollected entries
- Match targets to your depth access
- Use food to grow toward new zones
For Completionists
- Chase high-rarity gaps
- Target sea monsters last
- Plan multi-milestone sessions
Treat the index as your session planner. Before diving, open the bestiary, pick one or two uncaptured entries that match your current depth range, and target them directly instead of fishing blindly.
Index Entry Tiers Explained
Every entry in the fish index falls into a rough tier based on accessibility, difficulty, and depth requirement. Use this breakdown to decide what to pursue at each stage of your progression.
| Tier | Category | Capture Difficulty | Depth Requirement | Best For |
|---|---|---|---|---|
| C | Starter Fish | Low | Starting waters | Learning launch, reel, and collect basics |
| B | Regular Fish | Moderate | Accessible water | Building resources and harpoon practice |
| A | Deep-Water Fish | High | Deeper areas | Players with improved size and diving access |
| S | Sea Monsters | Very high | Deep water | Late-game collection milestones |
The tier structure mirrors the game's core loop: launch your harpoon, reel in the catch, eat food to grow, and dive deeper. Higher tiers simply demand more of each skill at once.
If an index entry lists a depth beyond your current growth, forcing the attempt usually wastes time. Return to shallower water, eat more food, and increase your body size before descending again.
Step-by-Step Collection Workflow
Completing index entries follows a repeatable cycle. This workflow connects your bestiary goals to the food-and-growth system that gates deeper water.
Review the Index
Open your bestiary and identify uncaptured entries within your current depth range. Pick one or two targets per session.
Eat Food to Grow
Collect and eat available food to increase your size. Growth is the requirement that unlocks deeper index entries.
Descend to the Target Depth
Use your added weight to sink toward the zone where your target fish appears. Confirm the depth matches the index entry.
Capture and Record
Aim carefully, connect the harpoon, and maintain control while reeling. Mark the capture status so progress stays accurate.
Bank and Repeat
Place valuable catches in your aquarium, then plan the next missing entry. Avoid lingering in open areas with rare fish, since other players can steal them.
One depth milestone, one growth target, and one missing entry is a balanced session plan. Spreading effort across too many goals slows index completion.
Aquarium Integration and Long-Term Planning
The fish index and your aquarium work together. Captured fish placed in the aquarium become part of a managed collection with its own growth and evolution potential, while the index tracks discovery across all 1,800+ species.
| Goal Type | Example | Why It Matters |
|---|---|---|
| Growth target | One rare fish receiving active attention | Keeps resources focused per cycle |
| Depth milestone | Reaching a new deeper zone | Unlocks a batch of new index entries |
| Collection entry | One specific missing fish | Converts progress into a concrete task |
| Security habit | Finishing captures before exploring open areas | Protects rare catches from PvP thieves |
Valuable fish attract multiple players. After securing a rare capture, create distance and complete the aquarium transfer before taking additional risks in open water.
Collection Readiness Checklist
Before committing to a deep-water session aimed at filling index gaps, run through this preparation list.
Pre-Dive Checklist:
- Identify target uncaptured entries in the index
- Confirm target depth matches current body size
- Eat sufficient food for the planned descent
- Warm up harpoon timing on regular fish
- Plan an exit route for protecting rare catches
If a capture attempt fails, do not repeat it unchanged. Return to safer water, resume food-and-growth activities, and re-enter deeper zones only after improving your size and timing.
Fish Index FAQ
Q: How many fish are in the Harpoon a Fish index?
The official game page lists 1,800+ unique fish species available to discover and collect, alongside deep-sea monsters that occupy the highest difficulty tier of the bestiary.
Q: How do I find out which fish I am missing?
Use the index's capture status markers. Filter to uncaptured entries, then sort by appearance depth to see which missing fish are actually reachable at your current growth stage.
Q: Why can't I reach some index entries?
Deeper entries are gated behind body size. The game's core loop requires eating food to grow larger so you can sink into deeper water where rarer fish and sea monsters appear.
Q: Can other players steal fish I captured for my index?
Yes, the game includes player-versus-player fish stealing. After securing a rare catch, move deliberately, monitor nearby harpoons, and finish your aquarium transfer instead of lingering in open areas.