The size of a small car. The speed of a motorway. A fish that is worth a million dollars. Pacific bluefin tuna are among the largest and fastest fish in the ocean. They are warm-blooded predators. This allows them to hunt in cold deep waters. Other fish slow down there. They become sluggish. The bluefin does not. It is built for power and endurance. It has been pushed to dangerously low levels. Decades of relentless overfishing are the cause. A fish that is too valuable for its own good. A Pacific bluefin can grow to three metres long. It can weigh half a tonne. It can swim at seventy kilometres per hour in short bursts. The body maintains its temperature well above the surrounding water. This endothermy is the same adaptation found in great white sharks. It allows bluefins to dive deep. They hunt in water that would stop a cold-blooded fish cold. The physiology is extreme. The performance is unmatched. The cost is high. The value of a single bluefin tuna at a Tokyo fish market can exceed a million dollars. That price tag has driven a fishing frenzy. Populations across the North Pacific have been decimated. Decades of overfishing have pushed this species to dangerously low levels. Illegal fishing and under-reporting have made the situation worse. The market drives the effort. The effort drives the decline. The decline drives the price higher. The cycle is vicious. In New Zealand waters, the Pacific bluefin is an extremely rare visitor. Only a handful of records exist. All are from northern waters of the North Island. It does not occur regularly here. The presence is accidental. The occurrence is sparse. The species belongs elsewhere. It wanders far from home. But rarely this far. The records are notable. Not common. This is not a fish that will ever be caught in New Zealand. It is a fish that might be read about. A ghost from the other side of the Pacific. The North Pacific is overfished. The bluefin is rare. A single fish is worth a million dollars. It does not know its own price. It does not know it is a ghost. The ignorance is total. The value is external. The status is precarious. It just wants to swim. A warm-blooded giant fighting for its survival. The ocean has changed faster than it can adapt. The bluefin is losing. The pressure is immense. The recovery is slow. The demand remains. The supply dwindles. The future is uncertain. The present is critical. It carries on.