Quick Overview of the Spotfin Hatchetfish
The Spotfin Hatchetfish (Thoracocharax stellatus), also known as the Silver Hatchetfish, is a captivating top-water characin native to the slow-moving rivers, flooded forests, and quiet tributaries of South America (including the Amazon and Paraná basins). Reaching a manageable adult size of 2 to 2.5 inches (5 to 6.3 cm), it is easily recognized by its distinctive, deep-bellied “hatchet” body keel and wing-like pectoral fins. Its brilliant, mirror-like silver chassis reflects ambient light across the upper layer of the tank, complemented by a bold, dark spot at the base of its dorsal fin.
Tank/Plant Profiles & Environmental Requirements
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Care Level: Easy to Moderate (Thrives best in established, well-covered aquariums with gentle surface flow)
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Growth Rate / Activity: Moderate Growth; Specialized Top-Water Column Swimmers & Surface Gliders
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Lighting: Low to Moderate (Appreciates shade provided by floating plants or tall background stem canopies)
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Temperature: 24°C – 28°C (Thrives naturally in Bacolod’s warm tropical climate)
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Tank Placement: Exclusive Surface / Top Water Column Dwellers
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Minimum Tank Size: 15–20 Gallons (Must be kept in a school of 6+ to build confidence and encourage natural swimming behavior)
Local Care Tips for Bacolod Aquarists
Bacolod Tap Water Conditioning & Tannin Synergy: Spotfin Hatchetfish are adaptable and do well in Bacolod’s typical neutral-to-slightly-hard tap water parameters (pH 6.8–7.5) when properly treated with a high-grade dechlorinator during water changes. Adding local Talisay (Indian Almond) leaves or natural driftwood provides beneficial humic acids and soft tannins, helping to condition the water and keep their slime coats healthy. Keep water flow gentle near the surface, as they prefer resting in calm upper pockets.
Floating Canopy & Aquascaping Layout: Because Spotfin Hatchetfish reside almost exclusively at the very top of the water column, floating plants like Amazon Frogbit or Salvinia are highly recommended. Their trailing root systems offer essential cover, security, and natural territory boundaries. Below, they look stunning hovering above bright carpets of Monte Carlo or Dwarf Hairgrass. Frame the background with tall stem plants or epiphytes like Anubias and Java Ferns anchored to hardscape—just make sure epiphyte rhizomes remain completely unburied above the soil to keep them from rotting!
Dietary Specifics & 100% Peaceful Community Harmony: Due to their upturned mouths, Spotfin Hatchetfish feed exclusively on the water’s surface and will rarely chase food that sinks past the top layer. Feed them high-quality floating micro-flakes, crushed freeze-dried foods, and regular treats of live or frozen fruit flies, daphnia, and baby brine shrimp. They are exceptionally peaceful and make great tankmates for Tetras, Rasboras, Corydoras, Plecos, and adult Neocaridina dwarf shrimp. A tight-fitting lid or mesh cover is 100% mandatory, as their strong pectoral muscles allow them to leap right out of open-top aquariums if startled!
