Sahyadria Denisonii

Datasheet

General Description

The Red-Line Torpedo Barb, scientifically known as Sahyadria Denisonii, is a popular aquarium fish native to southern India, specifically Kerala and Karnataka. It is a schooling species that has gained popularity in the ornamental trade under various names like "Denison's barb" and "rose line shark." The species exhibits distinct features, with red pigmentation that can be intensified through a diet rich in carotenoids, and it belongs to the family Cyprinidae.

Aquarium Setup

Maintaining the Red-Line Torpedo Barb in an aquarium requires a tank size of at least 240 litres. It is not challenging to care for, but it is essential to keep the setup well-maintained to mimic its natural habitat. These fish are not harmful to aquatic plants but are intolerant to organic pollutants, requiring clean water with high oxygen levels and moderate water movement. Regular water changes of 30-50% of the tank volume are recommended to ensure optimal conditions. (see table)

Behaviour

Known for its peaceful nature, the Red-Line Torpedo Barb is an ideal candidate for community aquariums. Being a schooling species, it is advisable to keep a group of 6-10 individuals to promote their natural behavior. However, it is important to note that the similar-looking S. chalakkudiensis can exhibit more aggressive tendencies compared to S. denisonii.

Feeding and Diet

In the wild, these barbs feed on a varied diet of worms, insects, crustaceans, and plant matter. In aquariums, they can be easily fed with a balanced diet consisting of small live and frozen foods like bloodworms, Daphnia, and Artemia, supplemented with high-quality dried foods. Sinking foods are preferred, and enhancing their red pigmentation is possible by incorporating carotenoid-rich foods into their diet.

Reproduction & Dimorphism

Reproduction of the Red-Line Torpedo Barb often involves the stimulation of hormone production for breeding in commercial settings. Studies have shown skewed sex ratios favoring males in the wild, with lower fecundity compared to related species. In captivity, accidental breeding has been reported, with successful instances in soft, acidic water conditions. Adult females tend to be slightly larger, heavier-bodied, and less colorful compared to males.

Habitat and Distribution

This species primarily inhabits streams and rivers in southern India, particularly in the states of Kerala and Karnataka. It is typically found in pristine, highly-oxygenated headwaters and rocky pools with dense vegetation. The distribution of the Red-Line Torpedo Barb is fragmented, with small populations remaining in various river systems across its range. Historical records indicate its presence in specific river systems, while the type locality corresponds to the Manimala River near Mundakayam in Kerala.