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This a very simple answer. They use their tentacles to push themselves through the water. No this is actually wrong. The squid uses its siphon to propel itself through the water. How it does this is it fills its mantle with water then the squid pushes it out through the Siphon.
The squid has a muscular mantle (outer covering) which, when expanded, fills with water. When these muscles contract, water is expelled through a single siphon and the squid is propelled in the opposite direction. The squid can control its direction by rotating (moving) the siphon.
Squid use jet propulsion to quickly escape predators by expelling water from their mantle cavity. They also release ink clouds as a distraction to confuse predators and allow them to escape.
The foot of the squid is it's tentacles, it enables the squid to move very very very very very very very fast. The foot is also the mantle of the squid (the mantle is a thick layer of tissues {muscle} all mollusks use to protect their guts). In this case the squid uses it's mantle to run away from predators (swim away).
the mantle is filled rather than emptied.
Squid (of any size) have beaks, which they use to bite off their food, which they then swallow.
Squid use a kind of jet power. Water is squirted at great pressure out of a nozzle on the squid's body. At times the squid can swim so fast that it may pop out of the water and glide through the air at 25 to 40 miles per hour. A squid may fly for 100 feet or more before it splashes back into the water.
Cuttlefish can move short distances by pulsating the lateral fins along the sides of their body. Cuttlefish often appear to hover in the water with this method. Cuttlefish, however, can only travel about 4 mph with their fins. Cuttlefish use their ''siphon'' to quickly "shoot" around underwater. Cuttelfish bring water into their ''mantle'' through the siphon, then they quickly expel it outward, creating a quick, forward movement for the cuttlefish. This is one of the methods that Cuttlefish use to escape.
Squid use oxygen from seawater for respiration. The seawater enters the mantle through the opening near the head, and passes over the gills. Oxygen diffuses from the water into the blood, and is transported to the gill (or branchial) hearts by a network of many blood vessels.
to siphon food into their gut.
A take-out connection with a gate valve placed at or near the low point of a siphon to empty the siphon when necessary to make repairs, to use it as a wasteway, to scout out deposited material in the siphon.
I ordered a delicious squid stir-fry for dinner at the new seafood restaurant in town.