Gymnostomus Siamensis

Datasheet

General Description

The Siamese Mud Carp, scientifically known as Gymnostomus siamensis, is distinguished by particular traits such as having 5½ lateral line scales, a relatively deep body with a depth fitting 3.2-3.4 times in standard length (SL), a large and broad head where its width fits 5.5-6.7 times in SL, and a plain silver-colored body without dark markings on the caudal peduncle. Within the Cyprinidae family, this species falls under the order Cypriniformes.

Aquarium Setup

The Siamese Mud Carp, with a maximum size of 15.0 cm, thrives in aquarium setups that mimic its natural habitat. A tank of at least 30 gallons is recommended, furnished with rocks, driftwood, and live plants to provide hiding spots and grazing areas. Water parameters should be maintained at a temperature range of 22-26°C (71.6-78.8°F), a pH of 6.5-7.5, and soft to moderately hard water. (see table for more details).

Behaviour

In its natural habitat, the Siamese Mud Carp is known to be a part of massive seasonal migrations of cyprinid fishes, especially during certain periods of the year when they are abundant in mainstream rivers. Within an aquarium environment, this species is generally peaceful but can exhibit territorial behavior towards its own species, especially during breeding periods.

Feeding and Diet

Wild Siamese Mud Carps primarily feed on periphyton, phytoplankton, and benthic algae. In a captive setting, they are omnivorous and can be fed a diet of high-quality flake food, sinking pellets, freeze-dried bloodworms, and vegetable matter. Offering a varied diet ensures their nutritional requirements are met.

Reproduction & Dimorphism

During the wet season, Siamese Mud Carps move into inundated zones with standing water to spawn. Differentiating between male and female specimens can be challenging as there are no distinct external dimorphic characteristics between the sexes.

Habitat and Distribution

Native to parts of Laos, Thailand, Cambodia, and Vietnam, the Siamese Mud Carp is commonly found in the middle to lower Mekong River basin, as well as in the Chao Phraya and Mae Klong watersheds in Thailand. Its preferred habitats include the main channel of the Mekong River, larger tributaries, smaller affluents, impoundments, and swamps with dense aquatic vegetation.