Blue Gularis Killifish Care Guide – Aquarium Setup, Diet & Breeding

Blue Gularis Killifish are among the most spectacular members of the killifish family. Males have an elongated body covered in vivid blue-green or turquoise markings, with red spotting and broad fins edged in blue, yellow or orange. Their dramatic colours become especially intense when the fish are displaying or competing for territory.

Females are considerably less colourful, usually showing a silvery brown or olive body with more subdued markings. Males can be assertive toward one another, particularly in smaller aquariums, while females are generally calmer but may still be chased during courtship. These killifish are best understood as pair-oriented or loosely harem-forming fish rather than conventional shoalers.

In the wild, Blue Gularis Killifish live in warm, shaded waters associated with tropical forest. Leaf litter, overhanging vegetation and subdued light help create a sheltered environment, while seasonal changes in water levels influence their unusual reproductive cycle. Their eggs can remain dormant during a period of drying before hatching when suitable water returns.

Fundulopanchax sjostedti is a comparatively large and predatory killifish. It is an engaging species for aquarists who enjoy observing courtship, territorial behaviour and the fascinating life cycle of West African annual and semi-annual killifish, but it is less suited to a busy community aquarium than many smaller, peaceful species.

Blue Gularis Killifish are native to parts of West Africa, especially southern Cameroon and neighbouring areas of Nigeria. They inhabit forest streams, seasonal pools and other slow-moving freshwater habitats across the Congo Basin region.

A pair or small group should have an aquarium of at least 60 litres, with a footprint of roughly 60 x 30 cm; a larger tank is preferable when keeping more than one male or adding tankmates. Use a secure lid because these powerful killifish can jump, and leave open swimming space alongside dense planting, floating plants, driftwood and other visual barriers. A dark sand or fine-gravel substrate suits their colours and helps create a shaded forest-stream appearance. Gentle filtration, subdued lighting and some surface cover are beneficial, with regular maintenance used to preserve clean, stable water.

Males can reach about 12–15 cm (4.7–5.9 inches) in length, while females are usually smaller at approximately 8–10 cm (3.1–3.9 inches).

Blue Gularis Killifish are carnivorous predators and should receive a varied diet based on meaty foods. Excellent options include live or frozen bloodworms, mosquito larvae, daphnia, brine shrimp, mysis shrimp and chopped earthworms. Larger individuals may also accept good-quality sinking carnivore pellets, but live and frozen foods are valuable for maintaining condition and encouraging natural feeding behaviour. Feed appropriately sized portions and avoid relying on dry food alone.

Blue Gularis Killifish are most suitable for a species aquarium or a carefully planned community containing similarly sized, peaceful fish that occupy different areas of the tank. Appropriate possibilities can include peaceful West African tetras, larger rasboras and calm, non-fin-nipping catfish, provided the aquarium is spacious enough. Avoid tiny tetras, small shrimp, delicate long-finned fish and very timid species, as adult Blue Gularis Killifish may view them as prey or harass them. Do not keep multiple males together unless the aquarium is large and heavily structured with visual barriers.

Blue Gularis Killifish can be bred by placing a compatible pair or a trio with one male and two females in a dedicated breeding aquarium. Provide spawning mops or a soft peat-based spawning medium, where the fish will deposit their eggs. The eggs are usually collected and incubated in damp peat or another suitable medium for several months, often around three to four months, before being wetted to hatch. Remove the adults or raise the fry separately, as both eggs and young may be eaten.

Males are much larger and more vividly coloured, with elongated bodies and strikingly extended, patterned dorsal, anal and caudal fins. Females are smaller, rounder and predominantly brownish or silvery, with much less intense colouration and shorter fins.