Threespine Stickleback
Gasterosteus aculeatus
At a Glance
Avg Length
3"
Avg Weight
0.05 lbs
World Record
0.2 lbs
Habitat
Coastal Streams, Estuaries
About the Threespine Stickleback
Threespine Stickleback (Gasterosteus aculeatus) inhabits coastal streams, estuaries. Popular technique: light tackle using small flies.
The Threespine Stickleback is one of the most recognizable anadromous species in North American waters, classified scientifically as <em>Gasterosteus aculeatus</em>. It belongs to the Other group, most commonly found in coastal streams, estuaries environments. Anglers target this species for both sport and table fare, and it appears across a broad range of water bodies throughout the United States.
A typical Threespine Stickleback runs 3 inches in length and weighs around 0.05 pounds, though fish in prime habitat regularly exceed these averages. The all-tackle world record stands at 0.2 lbs, set at Various, Pacific/Atlantic, making it a legitimate target for anglers chasing personal bests. Conservation status varies by region — check local regulations before keeping fish, as some waters have slot limits or catch-and-release requirements in place.
Habitat & Range
Primary habitat: Coastal Streams, Estuaries.
The Threespine Stickleback thrives across a wide range of anadromous environments throughout North America. Seasonal movements are driven by water temperature — fish tend to move into shallower water during spring and fall feeding periods, and push deeper or seek cover during the heat of summer and cold of winter. Understanding these patterns is critical to locating fish consistently across the season.
How to Fish for Threespine Stickleback
Best bait: Small Flies.
Technique: Light Tackle.
Match your presentation to the season and conditions. In clear water, downsize your bait and slow your retrieve. In stained or muddy water, switch to high-contrast colors and add vibration. Early morning and evening are the most productive windows during summer months. During spawning season, fish become highly territorial and will strike out of aggression as well as hunger.
World Record
The all-tackle world record Threespine Stickleback weighed 0.2 lbs, caught at Various, Pacific/Atlantic. This record represents the upper end of what this species achieves under ideal conditions. Most anglers targeting personal bests focus on proven trophy waters with the right combination of habitat, forage base, and light fishing pressure.
State Regulations
Regulations vary by state and water body. Before fishing for Threespine Stickleback, verify current size limits, bag limits, and open seasons with your state fish and wildlife agency. Check your state's fishing license requirements and season dates at the FishLog Fishing License guide.
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