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Swordfish prefer water temperatures between 18 and 22 °C (64 and 72 °F), [3] but have the widest tolerance among billfish, and can be found from 5 to 27 °C (41 to 81 °F). [6] This highly migratory species typically moves towards colder regions to feed during the summer. [ 6 ]
Some particular types of migration are anadromous, in which adult fish live in the sea and migrate into fresh water to spawn; and catadromous, in which adult fish live in fresh water and migrate into salt water to spawn. [2] Marine forage fish often make large migrations between their spawning, feeding and nursery grounds. Their movements are ...
At the end of a glide, they fold their pectoral fins to re-enter the sea, or drop their tails into the water to push against the water to lift for another glide, possibly changing direction. [ 14 ] [ 15 ] The curved profile of the "wing" is comparable to the aerodynamic shape of a bird wing. [ 16 ]
After the transition, the schools start migrating, extending up to 40 kilometres (25 mi) across the ocean, to shallow parts of the bank. There they spawn during the night. In the morning, the fish school back to deeper water again and then disband. Small groups of leaders were also discovered that significantly influenced much larger groups. [79]
Adult swordfish have no teeth, and other billfish have only small file-like teeth. They swallow their catch whole, head-first. Billfish do not normally spear with their bills, though occasionally a marlin will flip a fish into the air and bayonet it. Given the speed and power of these fish, when they do spear things the results can be dramatic.
"80% of our migratory birds here in North America are actually migrating at night," he said. "A large impact that humans actually have on birds during migration is with the light that we produce ...
This great fish migration is called the sardine run. Their sheer numbers create a feeding frenzy along the coastline. The run, containing millions of individual sardines, occurs when a current of cold water heads north from the Agulhas Bank up to Mozambique where it then leaves the coastline and goes further east into the Indian Ocean. During ...
Moreover, reindeer migrate an average of 12 to 34 miles per day and can run at speeds of up to 50 mph, even when they weigh up to 300 kg. These powerhouses of energy have become well-known in many ...