Aphyosemion volcanum is a species of killifish, which is a type of small freshwater fish belonging to the family Aplocheilidae. These fish are known for their vibrant colors and are popular among aquarium enthusiasts.

Here are some key characteristics and information about Aphyosemion volcanum:

1. Habitat: Aphyosemion volcanum is native to Western Africa, specifically in the region of Mount Cameroon, from which it derives its name. They are often found in slow-moving or stagnant waters, including streams, swamps, and small ponds.
2. Size: These fish are relatively small, with adults typically reaching lengths of 2 to 2.5 inches (5-6 centimeters).
3. Coloration: Aphyosemion volcanum is known for its stunning colors, which can vary between individuals and populations. Males often display more vibrant and striking colors than females, which is common among many species of killifish.
4. Behavior: Like many other killifish species, Aphyosemion volcanum is known for its territorial and sometimes aggressive behavior, especially among males during the breeding season.
5. Diet: In the wild, they are opportunistic carnivores, feeding on small invertebrates, insects, and other small prey. In captivity, they can be fed a diet of high-quality flake or pellet food, supplemented with live or frozen foods like brine shrimp, daphnia, and bloodworms.
6. Aquarium Care: Keeping it in an aquarium requires some care. They do best in a well-maintained aquarium with clean water. The aquarium should provide plenty of hiding places, such as plants and driftwood. Water conditions should be stable, with a temperature range of 72-78°F (22-26°C) and a slightly acidic to neutral pH.
7. Breeding: Breeding killifish, including Aphyosemion volcanum, can be challenging because they often require specific conditions to trigger spawning. They are known for their unique breeding behavior, where the eggs are laid in substrate (often peat moss) and need to be incubated under specific conditions to hatch.
8. Conservation: Some Aphyosemion species, including Aphyosemion volcanum, face threats in the wild due to habitat destruction and pollution. Conservation efforts are in place to protect their natural habitats and ensure the survival of these beautiful fish.

It’s important to note that Aphyosemion species, including Aphyosemion volcanum, have different care requirements depending on their specific populations and locations of origin. Therefore, it’s essential to research and provide suitable conditions based on the specific needs of the population you are keeping in your aquarium.