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Fishmetry — Your Aquatic Encyclopedia

Instantly access detailed profiles on thousands of fish species. Start by choosing a category or search for a specific fish.

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Image of Colorado Pikeminnow (Ptychocheilus lucius) fish

Colorado Pikeminnow

An active, powerful river predator, this species is highly migratory in nature, fast-swimming, and will dominate large freshwater systems.

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Image of Shortnose Gar (Lepisosteus platostomus) fish

Shortnose Gar

A calm but highly predatory ambush hunter, this gar is slow-moving, surface-oriented, and will consume any fish it can swallow.

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Image of Channel Catfish (Ictalurus punctatus) fish

Channel Catfish

Generally calm but opportunistic, this species is nocturnal, bottom-oriented, and may prey on small fish when space or food is limited.

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Environmental Indicator Species

In the wild, the presence of healthy Blue Acara populations often indicates stable water quality and balanced ecosystems. Their sensitivity to pollution mirrors patterns seen in species such as the Angelfish.

Community Tolerance Among Cichlids

The Blue Acara is one of the few cichlids that can coexist with the highly territorial Convict Cichlid under spacious conditions. This tolerance makes it popular in mixed Central and South American cichlid aquariums.

Relative of More Aggressive Cichlids

Although closely related to the Green Terror, the Blue Acara is significantly less aggressive. This genetic relationship highlights how small evolutionary differences can strongly influence temperament.

Parental Cooperation

The Blue Acara forms strong monogamous pairs and both parents actively guard eggs and fry, a trait shared with species like the Firemouth Cichlid. This cooperative behavior increases offspring survival in both wild and captive environments.

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Recent Blogs

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Freshwater vs Saltwater Aquariums: What to Choose blog image

Freshwater vs Saltwater Aquariums: What to Choose

A beginner-friendly comparison of freshwater and saltwater aquariums, covering costs, maintenance, and animal welfare considerations.

By Fishmetry Team - January 27, 2026

Lateral Line Erosion in Fish (LLE & HLLE): Causes and Prevention blog image

Lateral Line Erosion in Fish (LLE & HLLE): Causes and Prevention

Learn why aquarium fish develop LLE and HLLE, how to spot early warning signs, and what proven steps help prevent this common fish health issue.

By Fishmetry Team - January 22, 2026

Aquarium Care Guide: Filtration, Water Quality, and Fish Behavior blog image

Aquarium Care Guide: Filtration, Water Quality, and Fish Behavior

A complete aquarium care guide covering filtration maintenance, water parameters, tank size, temperature stability, and aggression control for healthy fish.

By Fishmetry Team - January 20, 2026

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