The Chilean jack mackerel looks very much like the greenback horse mackerel (Trachurus declivis) found around Australia and New Zealand.
The two species can be distinguished by the number of gill rakers (T. declivis 50–57, T. murphyi 51–65) and the number of scales and scutes in the lateral line (T. declivis 81–82, T. murphyi 89–113).

All three species are found schooling around the coast of New Zealand.
They are mainly captured using purse seine nets, and are managed as though they were one species or stock.

In its statistical returns, the FAO still treats the Pacific jack mackerel as though it were a subspecies.
The capture graph in the fisheries section above is based on the figures supplied by the FAO for the capture of Chilean jack mackerel, and presumably includes also the capture amounts for Pacific jack mackerel.
The Chilean jack mackerel looks very much like the greenback horse mackerel (Trachurus declivis) found around Australia and New Zealand. The two species can be distinguished by the number of gill rakers (T. declivis 50–57, T. murphyi 51–65) and the number of scales and scutes in the lateral line (T. declivis 81–82, T. murphyi 89–113).
All three species are found schooling around the coast of New Zealand. They are mainly captured using purse seine nets, and are managed as though they were one species or stock.
In its statistical returns, the FAO still treats the Pacific jack mackerel as though it were a subspecies. The capture graph in the fisheries section above is based on the figures supplied by the FAO for the capture of Chilean jack mackerel, and presumably includes also the capture amounts for Pacific jack mackerel.
Chilean jack mackerel