The distribution of Atlantic salmon is temperature dependent. While they live in fresh water, they have blue and red spots. When they mature, they take on a silver-blue sheen. The easiest way of identifying the adults is by the black spots predominantly above the lateral line; the caudal fin is usually unspotted.
The vermiculated sailfin catfish has rows of armour plating covering its body; the abdomen is almost completely covered in small plates. Colour pattern is generally dark brown with either darker spots or lighter spots (or vermiculations). The adult size can range from about 50–70cm. Environmental impacts of vermiculated sailfin catfish are not fully understood, but in locations where they are introduced and abundant, their feeding behaviours and burrowing activities can cause considerable disturbance.