Striped SnakeheadChanna striataOnde e quando observá-los

The striped snakehead is a freshwater predatory fish native to much of South and Southeast Asia, including the Mekong basin. It is particularly associated with warm, shallow waters on river floodplains. An accessory breathing organ allows it to take oxygen from the air and occupy waters where dissolved oxygen is low. It is an important food fish, harvested from the wild and raised in aquaculture. Although widespread, local populations can be affected by wetland drainage, pollution and heavy fishing.

Size

Commonly 30–60 cm long, with large individuals reaching about 90 cm.

Weight

Large individuals can reach about 3 kg.

Lifespan

Not well documented in the wild.

Status

Least Concern (IUCN).

Striped snakeheads are usually solitary outside the breeding period. They often wait among vegetation or near the bottom before making a short rush at prey. They regularly visit the surface to gulp air, even when they remain otherwise concealed. Breeding commonly coincides with rising water and seasonal rains, although its timing varies locally. A breeding pair prepares a nesting area among shallow-water vegetation. Both parents guard the eggs and young, which gather in a compact school. As floodwaters recede, fish may concentrate in remaining pools and other persistent waters.

• It breathes atmospheric air using specialised chambers above its gills.
• Both parents help defend the eggs and young.
• Young fish often travel together in a tight school.
• Its snake-like head gives the snakehead family its common name.

Wildlife opportunities depend on the river reach, water levels and species. River-specific viewing months have not been confirmed; general species seasons are not a local sighting forecast.

In the Mekong basin, striped snakeheads inhabit floodplain wetlands, marshes, ponds, canals and slow-flowing river margins. They also use rice fields and seasonally flooded land connected to waterways. Shallow water with aquatic plants provides cover for hunting and shelter for young fish. Their air-breathing ability helps them tolerate oxygen-poor conditions that exclude many other fishes. They are more characteristic of sheltered floodplain habitats than the deep, fast-flowing main river channel.

Adults mainly eat fish, but also take frogs, crustaceans and other available aquatic animals. Young fish initially feed on small invertebrates, shifting towards larger prey as they grow. Prey is captured with a rapid strike and held by a large mouth armed with teeth. Their diet varies with body size, habitat and seasonal prey availability.

Common name

Striped Snakehead

Scientific name

Channa striata

Animal group

Fish

Size

Commonly 30–60 cm long, with large individuals reaching about 90 cm.

Weight

Large individuals can reach about 3 kg.

Lifespan

Not well documented in the wild.

Status

Least Concern (IUCN).

Identification

Look for an elongated body, a broad, flattened head and a large mouth. The back is usually dark brown to olive, while the paler sides carry irregular dark bands or blotches that may appear oblique. Long dorsal and anal fins run along much of the body, ending before a rounded tail fin. Young fish can look quite different from adults, so distinguish this species from other Mekong snakeheads using several features rather than colour alone.