Reproductive cycle of the endemic and threatened fish Puntius shalynius (Cypriniformes: Cyprinidae) in Meghalaya, India.

Puntius shalynius is a highly endemic freshwater minor carp that is economically important and is threatened because of its ornamental value. The present investigation evaluated this barb gonadal maturation, based on morphology and spawning of this species in the Umiam river, Meghalaya, India. The population of this indigenous fish has declined due to its fragmented distribution and exploitation as an ornamental fish.

Scanning Electron Microscopic Studies on the Gills of the Catfish Heteropneustes fossilis (Bloch) Exposed to Copper at Varying pH.

Alterations in gill ultra-structure of the catfish, Heteropneustes fossilis exposed to copper at varying pH were investigated using scanning electron microscopy. Fish were treated with 3 ppm copper sulphate (48 h LC50 concentration at pH 7 ± 0.5) at varying pH of diluent water.