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Swordfish are ectothermic animals. Along with some species of sharks , they have special organs next to their eyes called heater cells which function to heat their eyes and brains. [ 13 ] Their eyes are heated to temperatures measured between 10 and 15 °C (18 and 27 °F) above the surrounding water temperature; this heating greatly improves ...
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Two species of Kansas Protosphyraena - the larger (about 3 m long) P. perniciosa and smaller P. nitida. In its general body plan, Protosphyraena resembled a modern sailfish, though it was smaller with a shorter rostrum, was somewhat less hydrodynamic, and adults possessed large blade-like teeth (adults of living swordfish species are toothless).
Fish are very diverse animals and can be categorised in many ways. Although most fish species have probably been discovered and described, about 250 new ones are still discovered every year. According to FishBase about 34,800 species of fish had been described as of February 2022, [ 5 ] which is more than the combined total of all other ...
Using the weight calculation formula, the swordfish measured 138 inches overall — 98 from the lower jaw to the fork of the tail — and had a girth of 64 inches. "It was a fat fish, too.
Another notable characteristic is the elongated rostrum (bill) consistent with that of other marlins and the swordfish, which together constitute what are known as billfish in sport fishing circles. Sailfish live in colder pelagic waters of all Earth's oceans, and hold the record for the highest speed of any marine animal.
The marlins are Istiophoriform fish, most closely related to the swordfish (which itself is the sole member of the family Xiphiidae). The carangiformes are believed to be the second-closest clade to marlins. Although previously thought to be closely related to Scombridae, genetic analysis only shows a slight relationship.
Oceanic nekton comprises aquatic animals largely from three clades: Vertebrates (phylum Chordata), particularly pelagic fish, cetaceans and sea turtles, form the largest contribution; these animals have endoskeletons made of bones and cartilages and propel themselves via a powerful tail and fan/paddle-shaped appendages such as fins, flippers or ...