A unique, surface-dwelling livebearer known for its elongated, pike-like lower jaw. Males are famous for 'wrestling' by locking jaws to establish dominance. They are strictly top-dwellers and excellent jumpers, requiring a tight-fitting lid to prevent escapes and snout injuries. They prefer hard, alkaline water and thrive in both freshwater and slightly brackish conditions.
At a Glance
Tank Requirements
Water Parameters
Temperament & Compatibility
Available Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Female
Females are significantly larger than males (up to 7cm) and lack red/yellow coloration on their fins. They are generally peaceful and should outnumber males (e.g., a 2:1 or 3:1 ratio) to minimize harassment from constant breeding attempts.
Differs in 2 traits from base species
Also known as: Standard, Female Halfbeak
Male
Males are much smaller (around 4cm), more colorful, and highly territorial. They frequently lock their delicate jaws to 'wrestle' for dominance. It is best to keep only one male per tank unless the tank is large enough (90cm+) to disperse aggression and establish distinct territories.
Differs in 3 traits from base species
Also known as: Wrestling Male, Silver
Wrestling Halfbeak Care Guide Summary
The Wrestling Halfbeak, scientifically known as Dermogenys pusilla, belongs to the Livebearers family group. Adults reach a maximum size of approximately 7 cm and have a fusiform body shape with a moderate growth rate. Classified as mostly peaceful, this species primarily occupies the surface zone of the aquarium and produces a low level of biological waste.
To thrive, the Wrestling Halfbeak requires a brackish tolerant aquarium with a minimum volume of 55 litres and a tank length of at least 60 cm. Water temperature should be maintained between 24°C and 28°C, with a pH range of 7–8.5 and a general hardness of 10–20 dGH. A moderate water flow is preferred.
The Wrestling Halfbeak is a rewarding species to keep, provided its core environmental needs are met. This species is available in 2 varieties: Female and Male. Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.
Wrestling Halfbeak Habitat Setup
When setting up an aquarium for the Wrestling Halfbeak, a moderate water flow best suits their natural preferences. Because this species occupies the surface zone, the aquarium layout should prioritise adequate surface area with floating cover to make them feel secure near the waterline. Useful additions include floating plants to diffuse overhead light and create shaded areas. Keepers should note that a tight-fitting lid is essential, as this species is a known jumper.
Wrestling Halfbeak Compatibility Notes
Classified as mostly peaceful, the Wrestling Halfbeak is a social species that requires the company of its own kind to thrive. When choosing tankmates, conspecific aggression can be intense, especially in smaller tanks and their energetic swimming style may stress more sedentary or timid species. Selecting tankmates that favour different water layers from the surface zone can help reduce competition and territorial overlap.
Frequently Asked Questions About Wrestling Halfbeak
How big does Wrestling Halfbeak get?+
What tank size does Wrestling Halfbeak need?+
What water parameters does Wrestling Halfbeak need?+
Is Wrestling Halfbeak peaceful or aggressive?+
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Does Wrestling Halfbeak need a lid on the tank?+
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