SUMMARY

SUMMARY

IDENTIFICATION

SCIENTIFIC NAME(s)

Trachurus declivis

SPECIES NAME(s)

Greenback horse mackerel, Jack mackerel

COMMON NAMES

Common jack mackerel, cowanyoung

Greenback horse mackerel, commonly known as "jack mackerel" and cowanyoung, is an important commercial species in the Oceania region, occurring along the Australian coast starting with southern Queensland, throughout southern Australia, and north to the central coast of Western Australia; is also found in the waters of New Zealand. 

The stock structure of jack mackerel is still unclear (Marton and Steven 2019) but there is evidence that the population found in eastern Australia is genetically distinct from the one found in western Australia, with a third distinct population in New Zealand. These conclusions are based on morphological and meristic differences between fish from the Great Australian Bight and eastern Australia, genetic differences between fish from the Great Australian Bight and New Zealand, and a lack of genetic difference between fish from eastern Tasmania and New South Wales (Bulman et al. 2008)(AFMA 2018)​. Eastern and Western assessment units are assumed with respective management measures (Marton and Steven 2019)(AFMA 2020).


ANALYSIS

Strengths
  • Effort has been low in the fishery for several years (2009–2017) and the stock is officially classified as "not overfished."

SCORES

Management Quality:

Management Strategy:

≥ 8

Managers Compliance:

10.0

Fishers Compliance:

10.0