Bluegill

Lepomis macrochirus is perhaps the most recognised freshwater fish in North America, widespread across the continent in lakes, ponds, reservoirs, and slow-moving rivers. Breeding males are genuinely beautiful — the deep laterally compressed body takes on a rich golden-orange hue on the breast and belly, contrasting with the iridescent blue opercular flap that gives the species its common name.

In the aquarium, Bluegills are active, inquisitive, and highly interactive with their keeper. They adjust readily to aquarium life when given appropriate temperature and space, and they transition to prepared foods faster than many other native species. They do best in cool, well-filtered water with ample swimming room.

Compatibility requires care: Bluegills establish clear hierarchies and the dominant fish will harass subordinates unless the aquarium provides enough space and visual breaks. A male-female pair or a group of young fish raised together in a large tank gives the best results.

Water: 10–27 °C, pH 6.5–8.5, neutral to moderately hard; strong filtration essential. Tank: 300 L minimum; open swimming area with gravel substrate and scattered rocks. Feeding: Earthworms, crickets, frozen invertebrates, quality pellets; omnivorous and enthusiastic. Breeding: Gravel nest; male highly territorial — use tank dividers or ensure ample space. Compatibility: Best with similarly sized robust natives; will bully smaller fish.