The handling (setting and hauling) of large lift nets, normally requires in addition one or several winches.The operations from the shore, from a canoe or a bigger boat includes the setting of the net at a certain depth opening facing upwards- the attraction of the fish over the above mentioned opening by light or bait, then the lifting and hauling of the net out of the water manually or mechanically.They are used primarily to catch fish and crustaceans, and may be submerged just below the water surface or close to the bottom.A person using hand lift nets usually operate it from the shore, on bridges, and sea coast from harbor walls.[citation needed] Portable hand lift nets do not or hardly have any negative environmental impact since the overall expected catch is always very little and when a few very small or juvenile fishes are caught they can be easily released alive.After being submerged at the required depth, the nets are lifted or hauled out of the water by the hand or mechanically.[citation needed] Stationary lift nets are mostly used to capture pelagic species and in this case boats are not often required.