Question

Where in Kerala has a new edible freshwater fish been discovered?
A. Pampa River
B. Periyar River
C. Kallada River
D. Kabini River

Answer 1

Fresh water fishes spend their entirety or their lifespan in fresh water where the degree of saltiness is low. Freshwater fishes live in rivers, streams and lakes which have less salinity nearly less than 0.05 percent.

Complete step by step answer: Freshwater fishes and marine water fishes survive in completely different environments. Marine fishes prefer living in oceans and seas. These are also known as salt water fishes because they can stay alive only in waters with high salinity levels.
Pampa River is the third longest river in Kerala which rises at an altitude of 1,650 metres. It travels a distance of 176 kilometres before joining Arabian Sea.
Periyar River is the longest river in Kerala with the largest discharge potential. It provides drinking water for several towns in Kerala. The length of this river is 244 kilometres.
Kallada River is one of two major rivers of Kerala. The length of this river is 121 kilometres.
Kabini River is also called Kasbani River or Kapila River. It originates in Kerala and travels through Karnataka.
A group of researchers discovered a new species of freshwater fish while exploring the waters of Pampa River in Kerala. The new species belongs to the Labeo genus and it is named as Labeo filiferus.
Therefore, the correct answer is Option A, Pampa River.

Note: Since the degree of salinity is low then the chances of fresh fish survival is high in the Pampa River. Fresh water fishes cannot survive in marine water where the salinity is comparatively higher than the freshwater rivers.