Aquatic Flora and Fauna

There is little habitat for aquatic life because:

  • The natural vegetation of the lagoon has been greatly modified by urban development and the spread of introduced plant species.
  • There are no saltmarshes or mangroves and only very small amounts of seagrass which fringe the shoreline in the lower reaches of the lagoon.

Fish species that can be found are:

  • Mullet
  • Bream
  • Flathead
  • Whiting

Tropical fish species that have been found in the Lagoon are:

  • Mangrove Jack
  • Giant Herring
  • Big-eyed Trevally
  • Australian Bass

A Gondwanan fish in Manly Lagoon Catchment!

In the creeks above Manly Dam, there is a Gondwanan fish species called Galaxias Brevipinnis, commonly called the Climbing Galaxias. This Gondwanan fish, which lives in Curl Curl creek is also found in New Zealand, another fragment of the great southern continent Gondwana. This fish is reputed to be the first fish to conquer the New Zealand Glacial lakes because of its phenonmenal climbing ability. It is a threatened species in Manly Dam.

Macrobenthic infauna :

The diversity and abundance of these is relatively low and particularly poor in the middle and upstream locations of the lagoon. This is indicative of poor bottom water quality and sediment contamination.


The Red-Crowned Toadlet (Pseudophryne australis) is restricted to Hawkebury Sandstone areas in the Manly Dam area. It is also a threatened species.

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