Animals living in water swim at different speeds because of their different types and lifestyles. 1967 The Soviet Union (now the Commonwealth of Independent States) published a "speed comparison table of animals in the sea". Among them, cetaceans: 55 km/h for porpoise, 50 km/h for fin whale, 65 km/h for killer whale and 22 km/h for sperm whale; Pinpoda: seal 354 Li/h, walrus18-20km/h; Fish: swordfish130km/h, swordfish120km/h, flying fish 65km/h, shark 40km/h; Cephalopods: squid 4l km/h, cuttlefish 26 km/h, octopus 15 km/h. As can be seen from this statistical table, swordfish swims the fastest.
Why does swordfish have such a high swimming speed? It turns out that it has a very typical streamlined body, with a smooth body surface, a long and sharp upper jaw, and a strong tail handle that can generate great impetus. When it swims forward rapidly, the long jaw like a spear plays the role of splitting water. Swordfish, which travels at a high speed of 130 km per hour, can pierce the thick bottom of the ship with its hard upper jaw!
Hippocampus swimming upright
Hippocampus has a strange body shape, and its head is at right angles to its body. Like a horse's head, it swims slowly in the sea. Its swimming posture is very special, with its head up and its body slightly inclined, and it can swim freely in the water by means of dorsal fin movement. If you are tired of swimming, wrap the tail with bending function around the stems and branches of seaweed to rest.
In addition, it is very interesting that it is not the hippocampus mother who is responsible for breeding offspring in the hippocampus family, but the hippocampus "father"-the male hippocampus, whose abdomen has an abdominal bag composed of skin folds. The female seahorse lays her eggs in the abdominal bag of the male seahorse, fertilizes the sperm, and then hatches in the abdominal bag of the "father" until the baby seahorse is born. The father of the seahorse can give birth to hundreds of baby seahorses at a time.
Free travel sucker fish
The sucker formed by the first dorsal fin on the head and back is long, with 22 ~ 26 pairs of lateral cartilaginous plates. The second dorsal node is as long as the base of gluteal fin, with 35 ~ 40 fins. The caudal fin is pointed in young fish and gradually becomes concave fork-shaped in adult fish.
Generally, the body length is 220 ~ 450 mm, and the maximum length is no more than 900 mm. Although its swimming ability is poor, it is distributed all over the world. It is mainly absorbed on the belly of a large shark or sea animal with strong swimming ability, and sometimes it is also absorbed on the bottom of the ship. It does not need to swim by itself and is taken to the oceans of the world. When it reaches the sea area rich in bait, it leaves the host and takes food. Then it will be adsorbed on a new host and continue to move to another sea area.
Widely distributed in tropical, subtropical and temperate waters of the world. China's coastal areas are all produced.