Jack mackerels (Trachurus spp.) in New Zealand waters

The jack mackerels, Trachurus declivis, T. novaezelandiae, and T. murphyi, together form an important fishery resource within the New Zealand Exclusive Economic Zone (EEZ). The distribution of T. murphyi extends to the east outside the EEZ and probably continues along the Subtropical Convergence Zone to South America. There is a large international fishery for this species in the central South Pacific somewhere between New Zealand and the 150 degrees W longitude. The available information on the biology and fishery for these species within the New Zealand zone and central South Pacific is summarize