Blue Gularis Killifish

The Blue Gularis Killifish is one of the largest and most spectacular killifish species available to aquarists. Native to West African streams, males develop an incredible array of colors including brilliant blue bodies, red spots, and elaborate finnage with extensions and streamers that give them a gularis (throat) appearance. Their common name comes from the blue coloration and the expandable throat region they display during courtship. These fish are known for their predatory nature and will eat any fish small enough to fit in their large mouths. While stunning to behold, their aggressive tendencies and size mean they are best kept as single specimens or in species-only setups. They are a rewarding challenge for experienced aquarists who can provide appropriate care and appreciate their complex behaviors and incredible appearance. Their relatively short lifespan of 2-3 years makes each moment with them precious.

Care Requirements

Tank Setup

Blue Gularis Killifish require a spacious tank with plenty of hiding spots and territories. A 30-gallon tank is recommended for a single fish or pair. Use soft, acidic water with dark substrate and subdued lighting to bring out their colors. Provide caves, driftwood, and dense planting to create territories and hiding places. Ensure the tank has a tight-fitting lid as they are known jumpers.

Water Quality

• Temperature: 72-78°F (22-26°C)
• pH: 6.0-7.5
• Water Hardness: Soft to moderate, 2-12 dGH
• Ammonia/Nitrite: 0 ppm
• Nitrate: <20 ppm

Feeding

These predators prefer live foods but can be trained to accept frozen alternatives. Offer bloodworms, brine shrimp, and high-quality carnivore pellets. They have large appetites appropriate for their size. Avoid feeding them feeder fish to prevent disease transmission. Feed once or twice daily with substantial portions.

Behavior & Compatibility

Blue Gularis are aggressive and territorial, especially males toward each other. They are best kept singly or in pairs with one male and multiple females in very large tanks. They will eat any fish small enough to fit in their mouths and should not be housed with community fish. Their predatory nature requires species-only setups or tanks with only very large, robust tank mates.

Tips for Success

• Best kept as single specimens due to their aggressive nature
• Provide multiple caves and hiding spots to establish territories
• They are excellent jumpers; a secure lid is absolutely essential
• Their large size requires substantial filtration and regular water changes
• Breeding them requires patience and proper conditioning with live foods
• Their short lifespan means enjoy them while you can; they are truly spectacular fish