"Rainwater killie'll skim the top in ditch water or salt and outlast my ice; flounder can't say no." - Nate Hollis
Quick Facts
Average Size
1.6–2.1 inches
0.001–0.004 lbs
World Record
Habitat
Brackish Coastal Estuaries
Best Techniques
Light Tackle Casting
Best Baits
Small Invertebrates Larvae
Challenge Score
Explorer: 37
< Explore This Species >
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🔥This paperclip-sized powerhouse can swing from rain-fresh to ocean-salty water within a single tide and keep cruising.
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02Anglers love it as live bait because it outlasts almost everything in a hot, sloshy bucket.
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03Its eggs come with Velcro-like filaments that glue to grass, shells, and yes-your cast net.
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04Scientists call Lucania parva ultra-euryhaline-its gill ion pumps literally retool overnight to match the water.
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05Mature at under two inches, it starts spawning while still the size of a house key.
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06When oxygen crashes, they cue up at the surface film and sip it like a snorkel line.
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07Its otoliths record fresh-to-salt detours like tree rings, letting biologists replay the fish's commute.
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08During courtship, males flash crisp vertical bars and hustle females into vegetation for a quick sticky egg-drop.
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09Microfishing tip: bring midge-sized hooks-anything bigger looks like a dinner plate to their pinhead mouths.
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10It sometimes hybridizes with its cousin Bluefin Killifish, creating wild pattern mashups that puzzle fish nerds.
Learn Real Facts — Choose Your Vibe
Trophy Rainwater Killifish Meter
Common Catch
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Trophy Fish
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World Record
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Length
Small
Weight
Small
Top Fisheries for Rainwater Killifish
Best places to catch Rainwater Killifish and how far they are from you.
From iconic trophy waters to bucket-list destinations, these are some of the best places on the planet to target Rainwater Killifish.
Florida
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Miles
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Tampa Bay
Florida
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Miles
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Chesapeake Bay
Maryland/Virginia
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Miles
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Galveston Bay
Texas
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Miles
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Barataria Bay
Louisiana
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Miles
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Seasonality Chart
Best months to catch Rainwater Killifish: May, Jun
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Rainwater Killifish Intelligence
Fishing Window
Good
In Season
Season Score
67/100
Trend
Declining
Peak Season In
8 Months
Difficulty Meter
37
Explorer
Beginner Friendly
Feeding Triggers
Time of Day
High
Temperature
High
Current
High
Weather
High
Most Important:
Current
Behavior
Rainwater Killifish
Behavior
Behavior Profile Radar
Strike
Rainwater Killifish
Strike
Strike Profile Radar
Positioning
Rainwater Killifish
Positioning
Positioning Radar
Fight
Rainwater Killifish
Fight
Fight Radar
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Rainwater Killifish Advice
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Where to Find Rainwater Killifish
Preferred Structure
Wood
Rock
Weeds
Undercuts
Depth Breaks
Water Column
Surface
Mid
Bottom
Cover vs Roam
Cover
Roam
Gear Loadout for Rainwater Killifish
A reliable starting setup for targeting Rainwater Killifish, based on typical size, habitat, and presentation style.
Core Setup
- ROD 6'6" ultralight spinning rod
- REEL 1000 size spinning reel
- LINE 2 to 4 lb mono or 6 lb braid
- LEADER 2 to 4 lb fluorocarbon, 1 to 3 ft
Lures & Baits
- tanago or size 26 to 30 hooks with tiny bits of shrimp
- bloodworm
- or bread
- micro sabiki
- 1/80 to 1/64 oz micro jigs
Tactical Notes
- sight fish along marsh grass, mangrove roots, and dock pilings
- use a small float or split shot for depth control
- chum lightly with crushed bread
- target slack to gentle tides in sheltered pockets
- set the hook immediately on any tap






