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If you think about it this fact makes perfect sense. Swordfish actually slash at their prey rather than stab at them with their sword shaped bill. Photo Credit: Wikipedia. Swordfish do not swim in schools and can often be found traveling alone. Sometimes you can see these creatures basking at the surface or even breaching the water in a powerful jump.
Full grown swordfish, typically years old, have very few natural predators. Some makos have been found with a broken sword in their heads. Like many open ocean bony fishes, swordfish start out as extremely tiny larvae, no more than a few millimeters long and weighing only a few hundredths of a gram. Soon after hatching, they already have a visible bill. Swordfish grow rapidly, and in the course of their lives they may increase their body weight by at least one million times.
Because swordfish undergo such an amazing transformation in size from being nearly microscopic to being one of the largest open ocean predators , they eat a wide variety of prey, throughout their lifetimes. At a young age, they eat tiny zooplankton, and their prey increases in size as they do. As adults, they eat fairly large bony fishes and squids. Similarly, swordfish are eaten by a wide variety of predators.
When they are newly hatched, they are eaten by other fishes that specialize on eating plankton. The size of their predators increases as they grow, and adult swordfish are not eaten by anything other than large toothed whales and some open ocean shark species.
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