This can be avoided if smaller, standard tanks with the same carrying capacity are placed side by side. Uninsulated fiberglass or marine plywood tanks work well for short trips. Metal tanks are less likely to be broken or damaged. Any hardware on the tank should be aluminum, stainless steel or other rust-resistant material. The top doors or lids of the tank should be large if fish will be loaded with a boom and fish bas-ket.
Large doors make fish removal easier if dip netting is required.
The tank drain can be located either in the rear or side of the tank. Side outlets allow easy unloading of fish to holding vats or ponds by means of chutes or ex-tended discharge pipes. These reduce rough handling caused by dip-netting. The discharge opening should be large enough to easily pass the largest fish hauled and should be equipped with a quick release gate or plug. Drain openings can be rectangular or round with round drains usually 3 to 8 inches in diameter.