Labeo chrysophekadion

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The Black Shark, or Labeo chrysophekadion, is a large Southeast Asian cyprinid with a dark body and a powerful profile. Despite its common name, it is not a shark but a riverine fish related to the labeos. It inhabits large river systems, channels and flooded areas, where it grazes algae and biofilm from submerged surfaces. Its adult size and active nature require an exceptionally spacious aquarium. In the aquarium trade, this species remains fairly uncommon, largely because of its considerable growth potential. It should be selected only by aquarists able to plan for its full adult size.

General species description

Labeo chrysophekadion is a large freshwater fish belonging to the family Cyprinidae. Its elongated, deep and uniformly dark body is highly distinctive, while its inferior mouth is adapted for grazing surfaces. It is an active species that mainly uses the lower part of the water column, close to the bottom and submerged structures. Young specimens may occasionally be sold as Black Sharks, but their adult size is often underestimated. Responsible care requires a very large aquarium, strong filtration and a durable layout. Its availability remains moderately limited in the ornamental fish trade.

Geographical origin and biotope

Countries of reference: Myanmar, Thailand, Laos, Cambodia and Vietnam. The species is associated with several major river systems in Southeast Asia, including the Mekong, Chao Phraya, Mae Klong and Salween basins. It occurs in channels, deep pools and floodplains, and may enter seasonally flooded forests during the rainy season. The habitat generally combines soft to moderately mineralized freshwater, mud, sand or gravel and submerged plant debris. Seasonal changes in water level and current are important features of its natural environment.

Precise location and local name

Labeo chrysophekadion is recorded from major continental river basins in Southeast Asia, from the lower Mekong to river systems in Thailand and Myanmar. It is not restricted to a single river population. The English trade name Black Shark is widely used in the aquarium hobby, while vernacular names vary between regions and local languages. Scientific identification is therefore important, since several dark-colored fishes are sold under common names containing the word shark.

Appearance and physical characteristics

The body of Labeo chrysophekadion is streamlined, thick and usually slate-gray to black, with dark fins and a very robust appearance. Its inferior mouth has lips suited to scraping biofilm and algae from stones, branches and other submerged surfaces. The dorsal fin is well developed, and the forked tail supports sustained swimming in current. Adults may reach approximately 90 cm under favorable natural conditions, making this fish suitable mainly for public installations or exceptionally large private aquariums. Coloration may appear paler in young specimens or under stressful conditions.

General diet

In the wild, Labeo chrysophekadion mainly grazes algae, periphyton and plant material deposited on stones, branches and other submerged surfaces. Its diet also includes organic detritus and small benthic invertebrates. In an aquarium, provide vegetable-based sinking wafers, algae foods, blanched vegetables and a controlled supplementary portion of protein-rich foods. Meals should be carefully measured to prevent obesity and excess waste. A varied diet supports healthy growth and coloration, but it can never replace the need for adequate swimming space.

Essential data

• River of origin: Mekong, Chao Phraya, Mae Klong and Salween river basins
• Local name used: Black Shark
• Origin of the scientific name: Name assigned by Pieter Bleeker when the species was described
• Full-name etymology: Labeo comes from Latin and refers to the lips; chrysophekadion is an Ancient Greek-derived epithet associated with dark and golden coloration
• Common/vernacular names: Black Shark, Black Sharkminnow
• Family: Cyprinidae
• Subfamily: Labeoninae
• Name pronunciation: luh-BEE-oh kris-oh-FEE-kay-dee-on
• Discovery: Pieter Bleeker, 1850
• Maximum adult size: About 90 cm
• Water temperature and pH: 24 to 28 °C; pH 6.5 to 7.5
• Watercourse appearance and surrounding vegetation: Large channels, deep pools and floodplains, with woody debris, riparian vegetation and seasonally flooded areas
• Typical tankmates: Barbonymus schwanenfeldii, Chromobotia macracanthus, Pangasianodon hypophthalmus
• Temperament and behavior: Active, powerful and potentially territorial with conspecifics in confined spaces; mainly benthic and grazing-oriented
• Water depth: Channels, deep pools and flooded areas of varying depth
• Sexual dimorphism: Difficult to identify in young fish; adult females may have a heavier body
• Bottom structure and flow: Mud, sand, gravel and plant debris; slow to moderate current depending on location and season

For greater success

Keeping Labeo chrysophekadion requires long-term planning because a young fish can quickly become a very large cyprinid. Provide an enormous aquarium or pond, oversized filtration and firmly secured decor. Clean, well-oxygenated and stable water is essential, as is a diet rich in vegetable matter. Avoid small community aquariums and delicate tankmates. With extensive swimming space and consistent water quality, this species can be maintained successfully by experienced aquarists.