Abstract: A moveable roof for a transportable tank for fish includes a roof platform attached to spaced roof joists secured at opposing ends to parallel headers laterally spaced and traversing a length of the roof platform. At least two pair of support arms is included, with each pair mounted on opposite sides of the tank. Further, each support arm has an upper support arm portion and a lower support arm portion. The upper and lower support arm portions are attached at a support arm pivot point. The lower support arm portion is pivotally attached to the corresponding sidewall of the tank and the upper support arm portion is pivotally attached to the header above said corresponding sidewall. Still further, a crank is positioned between the support arms of each pair of support arms.