|Sergestid shrimps are small planktonic nearly transparent shrimps that swim in enormous numbers in the water column. Some are found in shallow offshore waters while many are found in depths of 500-700 m (1600-2300 ft) or more. They are slim-bodied with long slender appendages. They can sometime be so abundant as to form sound-scattering layers. Their predators include fish, whales and squid. Although small in size, they occur in such abundance that they are fished commercially in some countries and used for food or shrimp paste.