Primary Industries and Regions SA, in consultation with RecFish SA, has changed the rules to simplify your handling For more information on the management and handling of Murray cod, please visit www.pir.sa.gov.au/murraycod Under the closure rules, fishers in the South Australian section of the Murray River and lower lakes are not allowed to target the species. In the 1800s and early 1900s, commercial fishers, recreational fishers, shoreline residents, and some fisheries scientists (e.g., Anderson, Stead, Langtry) recognized two species of cod in the southern Murray-Darling Basin, Murray cod and trout cod or „blue-nosed cod.“ Taxonomically, however, there was confusion. In addition to striking differences in size in sexual maturity and some rather unscientific considerations, some prominent fisheries scientists (e.g., Whitley) insisted on recognizing only one species of cod – Murray`s cod (then called Maccullochella macquariensis, after an early Australian fish researcher nicknamed McCulloch and the Macquarie River in New South Wales. where the holotype was captured). Then, when trout cod nearly disappeared in the 1900s, the distinction between the two species was further undermined and eventually challenged. In the 1970s, early genetic techniques confirmed that trout cod was a distinct species and showed that the original „Murray cod“ was indeed a trout cod. According to the rules of scientific classification, the name M. macquariensis remained with the original specimen, now known as trout cod, and a new name, M. peelii, for the Peel River, where the new holotype was caught, was invented for Murray cod.
Subsequently, two other cod were identified as separate species, eastern freshwater cod (M. ikei) and Mary River cod (M. mariensis).   David Grant: There is a catch-and-release season for Murray cod, which means the public can enjoy the fishery along the way. But once caught, the fish must be picked up immediately and released into the water. Murray cod is one of Australia`s largest native freshwater fish and has been listed as threatened under the Environmental Protection and Biodiversity Conservation Act 1999 since 2003. Over the past 29 years, 26,214,502 pounds (nearly 11,703 tonnes) [11,915,683 kg] of Murray cod have been consumed by Melbourne residents. The Superintendent of Markets (Mr. G.
B. Minns) included these figures in a statement today in which he pointed out that supply is declining. In 1918, the peak year, 2,229,024 pounds [1,011,068 kg] were received on the market, but since 1921, when 1,101,520 pounds [499,640 kg] were sent to Melbourne, supply has declined. Last year , he weighed only 551,040 lbs [249,950 kg].  There are ways to achieve even minimal impact by targeting the impressive Murray cod. We recommend the use of barbless hooks or heights and heavy cords. You`ll also notice that these boasts, from Grant and his friends, were all ingested in the water. Sometimes it`s a good idea to go out into the water to do whatever it takes to protect this majestic fish. Murray cod, like a number of other native Murray Darling fish species, has also managed to cross the Great Dividing Range at least once through natural river trapping events, resulting in several species and subspecies of coastal cod. The best known are the eastern freshwater cod of the Clarence River system in northern New South Wales and the Mary River cod of the Mary River system in southeastern Queensland, both threatened with extinction but survive today.
Coastal cod has also been found in the Richmond River system in northern New South Wales and the Brisbane River system in southern Queensland, but are now extinct.   Blackwater events are often described as „natural“ events – although there are historical records of relatively severe events in smaller, shorter-lived systems (e.g., Lower Lachlan, Upper Darling), there is no evidence of severe events in the Murray River and its larger southern tributaries prior to water extraction and regulation. These restrictions exist because of stock concerns. Murray`s cod (Maccullochella peelii) is an Australian freshwater fish in the family Percichthyidae.  Although the species is commonly referred to as cod, it is not related to northern hemisphere cod species (Gadus). Murray`s cod is an important part of Australian vertebrate life – as a supreme predator in the Murray-Darling River system – and also important to Australian human culture. Murray cod is Australia`s largest pure-water freshwater fish and one of the largest in the world. Other common names for Murray cod include cod, greenfish, Goodoo, Mary River cod, Murray perch, pond, pond and Queensland freshwater cod.  Female Murray cod have an egg count of no more than 10,000 when they reach sexual maturity.