A recent study revealed that there are some 300 species of freshwater fish dwelling in the lake[citation needed].

Algae growing on dead trees and branches serve as the main form of sustenance for the fishes.

From studies and observations conducted by the Department of Fisheries, species such as the big Lampam Sungai (barboides), Kelah (Malayan mahseer or Tor tambroides), Toman (snakehead), Tapah (wallagonia leerii) Kawan (Friendly Barb), Kalui (Giant Gouramy) and Kelisa (green arowana) are found in the water and around dead trees.

The jungles surrounding Kenyir Lake are home to some endangered species, such as Asian elephants and Malayan tigers.

Popular spots for jungle trekking are Pengkalan Gawi, Bewah at the Terengganuan section of the Taman Negara, along the rivers of Saok, Lasir, Tembat and Lawit.