I am going to talk about the Xiphias, as my previous post was about the whale. And this fish may swim in the same waters as the whale does.
The swordfish is named after its bill resembling a sword. This makes it superficially similar to other billfish such as marlin, but upon examination, their physiology is quite different and they are members of different families.
They commonly reach 3 m in length, and the maximum reported
is 4.55 m in length and 650 kg in weight. Females are larger than males, and Pacific swordfish reach a greater size than northwest Atlantic and Mediterranean swordfish.They reach maturity at 4–5 years of age and the maximum age is believed to be at least 9 years.
The oldest swordfish found in a recent study were a 16-year-old female
and 12-year-old male. Swordfish ages are derived, with difficulty, from
annual rings on fin rays.
Swordfish have evolved to be formidable predators. They possess acute
eyesight, with which they can locate prey, and their flesh consists
primarily of ‘white’ muscle which provides energy for sudden bursts of
activity, such as when in pursuit of their quarry . The swordfish then uses its bill to stun or impale its victim, slashes it into pieces or swallows it whole . Swordfish feed during the day , primarily on squid, but also fish and occasionally crustaceans
Swordfish have special organs next to their eyes
to heat their eyes and brains. Temperatures of 10 to 15°C above the
surrounding water temperature have been measured. The heating of the
eyes greatly improves their vision, and consequently improves their ability to catch prey.
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