Three-Spined Stickleback (Gasterosteus aculeatus)
Overview
The Three-Spined Stickleback is a small, fascinating freshwater fish known for its distinctive three dorsal spines and streamlined body. Renowned for its interesting behavior, including nest-building and territorial displays, it is an excellent choice for observing natural fish behaviors in community or species-specific tanks.
Origin
Northern Hemisphere – Europe, Asia, and North America
Feeding
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Omnivorous: feeds on small invertebrates, crustaceans, insect larvae, and micro-pellets
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Will also accept frozen or live foods such as daphnia and brine shrimp
Tank Mates
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Peaceful small fish and invertebrates
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Avoid larger or aggressive species that may prey on them
Aggression
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Males can be territorial during breeding season
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Generally peaceful outside breeding periods
Experience Level
Beginner to intermediate
Water Parameters
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Temperature: 10–22°C (50–72°F)
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pH: 6.5–8.0
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Hardness: Soft to moderately hard
Notes
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Provides excellent opportunities to observe unique behaviors like nest building and courtship
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Thrives in aquariums with plants, rocks, and hiding spots
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Adds both activity and natural charm to freshwater tanks
A small, hardy, and behaviorally fascinating fish, ideal for aquarists interested in natural freshwater behaviors and a peaceful community species.