Hingemouth
Pogonias cromis
Hingemouth (Pogonias cromis) — Varies care, Peaceful, under Other. Minimum tank in the app: 36 US gal min; aim for 73–82°F and pH 6.5–7.5. Hingemouths are intriguing additions for aquarists who appreciate semi-aggressive species with a unique feeding style.

Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.
Natural distribution
North America
- Central America & Mexico
Regional colours match the stocking calculator’s origin map.
Hingemouth Tank Setup
Create a balanced environment that offers adequate open swimming space complemented by strategic cover, using rocks or driftwood to break line of sight. Moderate flow can stimulate natural behaviours, while a substrate that mimics their varied origins can enhance comfort. Keep lighting moderate to highlight their subtle colours without causing stress.
What Do Hingemouths Eat?
Hingemouths feed at a moderate pace, which can lead to competition during feeding times, especially if housed with faster, more assertive feeders. A varied diet is crucial not only for health but to bring out their vibrant colours; consider incorporating live or frozen foods occasionally for optimal nutrition.
Hingemouth Tank Mates
Ideal tank mates include similarly sized species with non-aggressive behaviours to maintain harmony. Avoid overly small or overly aggressive fish that might provoke stress or competition. When housed with others, ensure there's enough territory to prevent intraspecies conflict, as they can be territorial in confined spaces.
Are Hingemouths Good for Beginners?
Care demand varies with setup and individual fish; use the numbers above as your baseline. Aquarists often overlook the need for adequate space and structure in the tank, leading to stress and reduced activity levels. Failing to monitor feeding dynamics can also result in one fish dominating food resources, causing health issues for others.
Building a community? Run the full list through the stocking calculator before you add anything else.
Log tests and reminders in App-aquatic—free, same data you see here.




