Dermogenys sp. silver 4 - (Dermogenys sp.) — 4-6cm

Overview

Silver Halfbeak (Dermogenys sp. silver) is a sleek, surface-dwelling livebearer with a distinctive elongated lower jaw, ideal for aquarists seeking an unusual Southeast Asian species. Native to fresh and brackish waters of Southeast Asia, including Malaysia, Indonesia, Thailand, Singapore, Borneo, and Sumatra (exact locality for this silver form is unknown), this species is prized for its unique appearance, active behavior, and fascinating breeding biology. Now available for sale UK from Tropical Fish Co, this striking surface-dweller is ideal for the community aquarium keeper seeking something different.

Appearance

The Silver Halfbeak typically reaches around 6 cm in total length, making it a small to medium-sized halfbeak. The body is elongated and streamlined, with a shimmering silver or pale gold base color. The most distinctive feature is the elongated lower jaw, which gives the species its "halfbeak" common name. The fins are delicate and transparent, often showing subtle hints of color in well-conditioned males. Females are generally larger and more robust. Healthy specimens have bright, clear eyes and smooth, undamaged scales.

Natural Habitat

In the wild, Dermogenys species inhabit fresh and brackish waters of Southeast Asia, including rivers, streams, estuaries, and coastal habitats. These waters are typically warm, well-oxygenated, and moderately hard, with sandy or muddy substrates and plenty of aquatic vegetation providing cover. The fish spend much of their time near the surface, feeding on small insects, larvae, and zooplankton. They are adapted to life at the air-water interface and use their elongated jaws to capture prey from the surface.

Aquarium Setup

A well-filtered aquarium of at least 75 litres is recommended for a small group of Silver Halfbeaks. Use a fine gravel or sand substrate and incorporate smooth rocks, driftwood, and live plants to provide visual interest and hiding places. Ensure good filtration and moderate water movement to maintain high oxygen levels. A tightly fitting lid is essential, as halfbeaks are powerful jumpers. Maintain stable, warm water and provide plenty of surface space for feeding and breeding.

Feeding

The Silver Halfbeak is a carnivore and thrives on a diet of live and frozen meaty foods. Offer small insects, mosquito larvae, daphnia, brine shrimp, and other small crustaceans daily. Many individuals also accept quality micro-pellets, but frequent live foods are essential for maintaining health and breeding condition. Feed once or twice daily, ensuring food is offered at the surface where the fish naturally feed.

Behaviour

This halfbeak is semi-aggressive and best kept in a small group in a suitably sized aquarium. Males can be territorial toward one another, especially during breeding, and may engage in displays and sparring. They spend much of their time near the surface, constantly on the move and feeding. Due to their semi-aggressive nature, they may become stressed or aggressive in cramped conditions or with inappropriate tankmates.

Tank Mates

The Silver Halfbeak is suitable for a community aquarium with other peaceful, similarly sized fish. Good tankmates include peaceful, similarly sized fish that occupy midwater or lower levels, small brackish-water fish only if they are calm and not fin-nippers, and fast, non-aggressive fish that will not compete at the surface. Avoid large predatory fish, fin-nipping fish, aggressive territorial species, slow or long-finned fish, and very small fry or shrimp.

Breeding

Breeding the Silver Halfbeak is achievable with careful preparation. This is a viviparous livebearer, with males using an intromittent anal fin (andropodium) to fertilize females internally. Provide calm conditions, excellent water quality, and a well-fed group. Fry are relatively large and can be raised on tiny live foods such as baby brine shrimp.

Why Buy from Tropical Fish Co

Tropical Fish Co is a leading UK aquatics specialist offering unusual and fascinating species like the Silver Halfbeak direct to your door. Every fish is quarantined, inspected, and dispatched with expert care to ensure it arrives in peak condition. With decades of experience, transparent pricing, and exceptional customer support, we make it easy to add unique, striking species to your collection. Order online today and enjoy fast, reliable delivery across the UK.