New Zealand grayling, particularly in waters that, with the exception of trout introduction, appeared remote and undisturbed. S. parasitica is inevitably introduced with salmonids and is strongly implicated in very severe fish kills of the closely related Australian grayling soon after trout introduction in Australia. References Prototroctes Endemic freshwater fish of New Zealand Extinct animals of New Zealand Fish extinctions since 1500 Fish described in 1870 Taxa named by Albert Günther