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Mastacembelus armatus (Lacepede) is one of the most important eel like hillstream fish belonging to order Mastacembeliformes and family Mastacembelidae. During last few decades, the population of this species is considerably declining due to overfishing and other anthropogenic activities. Present investigation is an attempt towards conservation of this species in which reproductive power of the fish is estimated and preferred habitat and breeding grounds of fish were studied. The fish is monsoon breeder with maximum fecundity 11810.667±1716.994, observed in a fish size of 42.233±1.365 cm and body weight 153.333±7.638 g. The size of mature egg ranges from 1.2-1.6 mm. With the help of regression analysis, the relationship of fecundity with different body parameters was also traced out. It is suggested that avoiding fish catch during breeding season will be very helpful in conservation of species.

FECUNDITY ANALYSIS OF A FRESHWATER FISH MASTACEMBELUS ARMATUS (LACEPEDE) FROM RIVER NAYAR, UTTARAKHAND