what causes asian carp to jump out of the water
Asian carp Silver carp have become notorious for being easily frightened by boats and personal watercraft, which cause them to leap high into the air. The fish can jump up to 2.5–3.0 m (8–10 ft) into the air, and numerous boaters have been severely injured by collisions with the fish.[3] According to the EPA, "reported injuries include cuts from fins, black eyes, broken bones, back injuries, and concussions.".[4] Silver carp can grow to 45 kg (100 lb) in mass.[5] This behavior has sometimes also been attributed to the very similar bighead carp, but this is uncommon. Bighead carp do not normally jump when frightened.[1] Catching jumping carp in nets has become part of the Redneck Fishing Tournament, in Bath, Illinois.[6] Other parties, such as the Peoria Carp Hunters, have taken advantage of the jumping ability as a mechanism of hunting the carp, in some cases to purge the invasive species.[7]
Illusions of self-motion After being on a small boat for a few hours and then going back onto land, it may feel like there is still rising and falling, as if one is still on the boat.[4] It can also occur on other situations, such as after a long train journey. It is not clear whether sea legs is a form of aftereffect to the predominant frequency of the stimulation (e.g., the waves or the rocking of the train), whether it is a form of learning to adjust one's gait and posture, or whether it is a form of the Tetris effect. Sea legs needs to be distinguished from mal de debarquement, which is much more disturbing and long-lasting.