Retropinna tasmanica (塔斯馬尼亞後鰭鮭(塔斯馬尼亞青瓜魚)) is a species of ray-finned fishes in the family New Zealand smelts. They are associated with freshwater habitat. Individuals can grow to 7.0 cm.
Definition: length from the tip of the snout to the tip of the longer lobe of the caudal fin, usually measured with the lobes compressed along the midline. It is a straight-line measure, not measured over the curve of the body