Murray cod (Maccullochella peelii) is found in the low altitude portions of the Murray-Darling river system in eastern Australia. This is naturally found from extreme southern Queensland south through central New South Wales into southern South Australia. This fish is normally less than about 36 inches in length. However, records exist for specimens over 6 feet long and weighing over 250 pounds. This is the largest Australian freshwater fish, and also one of the world's largest freshwater fish. This is a heavy bodied fish with a lower jaw that usually extends slightly. There are two dorsal fins. The front is spined, and the rear one is soft and rounded. The color is green to yellow green with darker markings. This fish is an efficient predator taking most other species of fish and some crustaceans. This fish was commercially harvested in previous years.

Australian cod genus (Maccullochella) of freshwater fish can be found in eastern Australia. Although discussions are continuing, it appears that two lifeforms of this group, the Richmond River Cod and Brisbane River Cod are extinct.

The seabass (Perichthyidae) family is the subject of some conflicting nomenclature. Some scientists place the North Amrican sea bass (Morone) in this family. Herein, we have used this for a group of the closely related Australian freshwater fish.

Perch-like Fish, Order Perciformes, are the largest order of fish in both freshwater and shallow saltwater. Most of the conventional fish belong to this order. The bass, bluegills, perch and crappies of freshwater plus the groupers and sea bass of salt water belong to this order. The fish all have spiny rays in their fins and the tail fin has seventeen rays. There are approximately 150 families. Herein, we have placed the families in alphabetical sequence within this order. (In some instances the typical taxonomic sequence of families is not much help. Consider, for example, that the barracudas are usually placed between the mullets and the threadfins.)

Bony fish, Class Teleostomi, are a class of chordates that include the majority of fish-like animals found on earth. They are characterized by a bony jaw and a bony skeleton. They are found in both fresh and marine waters.

Backboned Animals (Phylum Chordata) are the most advanced group of animals on earth. These animals are characterized by having a spinal cord or backbone. Most members have a clearly defined brain that controls the organism through a spinal cord. Fish, amphibians, reptiles, birds, and mammals are in this phylum.

Currently, some taxonomists believe that the fish should be divided into two groups (sharks and regular fishes) and that there are some other primitive groups in the phylum such as hagfish or lampreys.

Animal Kingdom contains numerous organisms that feed on other animals or plants. Included in the animal kingdom are the lower marine invertebrates such as sponges and corals, the jointed legged animals such as insects and spiders, and the backboned animals such as fish, amphibians, reptiles, birds, and mammals.

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