Among marine communities, the importance of small species has been neglected and major attention has been paid to the larger representatives. Small copepods are now assigned as a significant component within marine food webs. Their ecological habitat comprises estuarine, pelagic and coastal environments. Oithona plays a vital role as a food source for other copepods, Chaetognaths, fish larvae and planktivorous fishes. ... Therefore, the present study was conducted to determine the species composition of the genus Oithona previously not known from the coastal waters of Pakistan
