A school of trevally arriving over a reef moves with a unified intention that is difficult not to find impressive. Silver flanks catching the light, bodies angled slightly downward, the whole mass adjusting direction with the casual synchrony of a single organism that happens to be several hundred fish. Then something flushes from the reef below, and the intention resolves into action, and the school is somewhere else. Pseudocaranx georgianus, the silver trevally, is the most prized inshore schooling fish in northern New Zealand and one of the few species that bridges recreational and commercial fishing with equal enthusiasm on both sides. Araara to Māori, it is a deep-bodied, powerful jack with blue-green above and silver-white below, a black spot on the gill cover, and a deeply forked tail that generates the burst speed it uses to chase prey and escape larger predators. The lateral line curves pronouncedly, and hard scutes line the narrow caudal peduncle on either side. Juveniles carry a yellow stripe along the mid-body that fades with age. Large fish develop a pronounced hump on the forehead as the skull crest enlarges. In the far north, specimens exceeding 60 centimetres are not unusual. The species is confined mainly to waters north of Cook Strait, where sea temperatures remain suitable year-round. In summer, warmer water pushes schools south along both coasts, and trevally are occasionally encountered as far down as Otago. The Poor Knights Islands, the Hen and Chickens, and the bays and headlands of Northland are reliable locations. Surfcasters know trevally as one of the harder-fighting species available from the shore, particularly when a school is working a current edge in front of a rocky point. Growth is slow and maturity comes late, which creates the standard vulnerability: a heavily fished population does not replenish quickly. The Quota Management System applies catch limits under the Fisheries Act, and the stock is monitored, but trevally are also subject to substantial recreational take that is difficult to quantify precisely. The biology does not forgive overfishing easily, and the numbers that look comfortable in a good year can erode over several poor ones. Trevally are also under active investigation as an aquaculture candidate. Captive breeding programmes have produced first-generation cohorts and early results on growth heritability are encouraging. Whether that translates to commercial-scale production is still being worked out, but the interest is genuine and the biology is cooperative enough that the question seems worth pursuing.