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NEWS
Licence funds Mangrove Jack study
I'm all right, Jack. World's 'oldest' is 57 and from a NSW offshore reefRecent research investigating the age and growth of Mangrove Jack (Lutjanus argentimaculatus) from estuaries and offshore habitats in NSW has established that these revered sportsfish can reach impressive ages.
The oldest fish aged in the study was 57 years with an 826mm fork length (FL), making it the oldest jack and the oldest individual from the family Lutjanidae yet aged worldwide!
Other large jacks aged during the project ranged from 20-52 years of age and 730-1019mm fork length (FL). All of these big, old jacks were from offshore reefs. In contrast, the oldest estuary-dwelling jack aged was eight years old with a 584mm FL.
The jacks were aged by counting growth rings in thinly-sectioned otoliths or ear bones.
This research project is being undertaken jointly by staff from Department of Primary Industries and Southern Cross University using funds from the Recreational Fishing Trust.
A big Mangrove Jack
was caught by a trawler off Eden on the south coast of NSW earlier this year, well south of its usual range and undoubtedly one of the big old boys.
was caught by a trawler off Eden on the south coast of NSW earlier this year, well south of its usual range and undoubtedly one of the big old boys.
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Written byBoatsales Staff
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