The ghost of the Canterbury Plains. Most people will never see one. This is a small slender fish. It rarely grows longer than 10 centimetres. A distinctive elongated lower jaw extends beyond the upper jaw. Hence the name. Colour is muted olive-brown to silvery-grey. A faint darker stripe often runs along the sides. Not a flashy fish. It does not need to be. It just needs to survive. A fish that has learned to live with less. The adaptation is subtle. The existence is precarious. Insect specialists of the spring creek define this species. Lowland longjaw galaxias feed on small insects and crustaceans. They pick them off rocks and out of the current with quick precise bites. They are not strong swimmers. They prefer slow deep pools. Here they can hover without expending too much energy. Incredibly vulnerable to changes in environment. A single drought could wipe out an entire population. A single irrigation pump. A single pollution event. A fish that lives on the edge. The margin for error is zero. The canary in the coal mine for the Canterbury Plains describes their role. Their presence is a sign of a healthy spring-fed stream. Their absence is a sign that something has gone wrong. The farmers do not always listen. The water keeps getting pumped. The extraction continues. The habitat shrinks. The signal is ignored. The consequence is cumulative. To find a lowland longjaw galaxias is to find a miracle. It is a tiny long-jawed fish in a clear spring-fed creek. A survivor in a landscape that has been drained, pumped and ploughed almost to death. This is the fish of the last stream. The one that survives in ditches and drains. In the few remaining pockets of clean spring-fed water. A tiny fragile ghost of the Canterbury Plains. The rarity is absolute. The location is specific. The survival is accidental. The creek is clear. The water is cold. The longjaw hovers in a deep pool, waiting for a bug to drift past. The irrigation pumps roar in the distance. The farmer does not know the fish is there. The fish does not know the farmer is there. It just waits for the next bug. The indifference is mutual. The threat is constant. The future is uncertain. It carries on in the shallows. Unseen by the casual observer. But prized by those who know. It remains in the spring. A testament to the intact waterway. A relic of the wild plain. It waits for the flow. Or it does not. The choice is hydrological. The outcome is certain. The fish persists.