Publication (Media): How old is that cod?

Publication Type:	Media Release
Publication Name:	How old is that cod?

Reference Information

Wilson, G. and Adams, J. (2003) How old is that cod? - Oct 09 2003, CRCFE, Canberra - Media Release.

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Other information:

How old is that cod?

Researchers at the Murray-Darling Freshwater Research Centre’s Northern Laboratory in Goondiwindi have commenced a study into the biology of Murray cod in local river systems. The study is particularly aimed at unravelling how fast these fish are growing in our waterways and at what age they are beginning their reproduction.

The project, led by Dr Glenn Wilson, Scientist In charge at the Goondiwindi Laboratory, will use annual growth rings laid down in the ear bones or ‘otoliths’ of Murray cod to age these fish.

“By combining this information with other details such as the length and total weight of the fish, an idea of its growth rate can be gained.”

“Although we encourage the release of Murray cod back into our waterways by anglers, we do realise that some are kept to eat” Dr Wilson says. “It is a bonus if we can use these same fish to improve our knowledge of this iconic native species.”

“As we are working with the otoliths, we only require the head of the fish to extract these bones, a process which does not affect the head if it is to be mounted as a trophy” Dr Wilson explains. “In addition to the head, anglers are encouraged to provide us with details of the length, sex and total weight of the fish, plus note which river the fish was caught in.”

Fish to be used in the project will predominantly come from local anglers. Importantly, specimens have already been donated by fishermen from across the Border Rivers and Balonne river systems, including fish up to over 70 lb.

“We ask that people freeze the heads and then contact the lab to arrange collection. In turn, we will provide feedback to the angler as to how old his or her fish was at the time of capture.”

This project will provide an important insight into the biology of this fish species in our western rivers.

“Virtually nothing is known about the age or growth rates of native fish in the northern Murray Darling Basin. Information gained through this project will ultimately benefit fisherman and managers alike,” Dr Wilson adds.

If you wish to become involved with this important research, the laboratory can be contacted on (07) 4671 4650, 0429 837 082 or gwilson@northernlab.net.au.

Digital photos available:
· a live Murray cod being released
· a Murray cod otolith

CONTACTS

Dr Glenn Wilson, Scientist in Charge (Interviews)
Phone: 07 4671 4650 (BH) or 0429 837 082
Facsimile 07 4671 4858

Ms Janey Adams, Senior Community Scientist (Media Liaison)
Phone 07 4671 4650 (BH) or 0429 876 458

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