The pike killifish, Belonesox belizanus, also known as the pike topminnow or freshwater needlefish, is a species native to freshwater habitats in Central America, particularly in Belize and Mexico. These fish are characterized by their elongated, needle-like bodies and predatory behavior.

1. Habitat: Pike killifish are commonly found in slow-moving or still freshwater environments such as ponds, lakes, and slow-flowing rivers. They tend to inhabit areas with aquatic vegetation, submerged structures, and overhanging vegetation, providing them with both shelter and hunting grounds.

2. Water Parameters: These fish typically thrive in warm water conditions. They prefer temperatures ranging from 20 to 28 degrees Celsius (68 to 82 degrees Fahrenheit). The water quality should be well-maintained, with a pH level between 6.5 and 8.0.

3. Tank Setup: In captivity, pike killifish are often kept in aquariums with a minimum size of 30 gallons. The tank should be well-aerated and equipped with a filter to ensure good water quality. Adding artificial or live plants can provide hiding spots and simulate their natural environment.

4. Substrate: A sandy or fine gravel substrate is suitable for the pike killifish. This allows them to exhibit their natural behavior, including burrowing and searching for prey in the substrate.

5. Diet: Pike killifish are carnivorous and have a voracious appetite. In the wild, they feed on small fish, insects, and other aquatic invertebrates. In captivity, they can be fed a diet of live or frozen foods such as small fish, worms, and insect larvae.

6. Compatibility: While pike killifish are generally aggressive towards smaller fish and may eat smaller tankmates, they can be kept with larger, more robust species that are not easily intimidated.

7. Behavior: These fish are known for their aggressive and predatory behavior. They are skilled jumpers, so it's important to have a secure lid on the aquarium to prevent them from escaping.

An environment that mimics their natural habitat and offering a varied and appropriate diet are key factors in keeping these fish healthy and thriving.