Once the sperm find the eggs, fertilization occurs. While spawning, a single female may release several million eggs, increasing the likelihood that some will be fertilized and that at least one hatched larva will grow to reach adulthood. Though almost all fishes are cold blooded, blue marlin and the other billfishes have a specialized blood vessel structure — called a countercurrent exchanger — that allows them to warm their brains and eyes. This adaptation provides them with a major advantage when hunting, by allowing them to think more quickly and see more clearly.
The blue marlin is a targeted fishery species in only a limited number of areas but is captured as accidental bycatch in fisheries targeting other species throughout its range. In some areas, this accidental capture is threatening blue marlin populations, and scientists consider the species vulnerable to extinction.
Generally speaking, blue marlin populations are decreasing in numbers. Though it is not targeted commercially throughout much of its range, the blue marlin is one of the most highly sought after big game fishes in the world. Sport fishing enthusiasts spend tens of thousands of dollars to catch large blue marlin, and they are typically released alive though recent data suggests that released individuals may frequently die after the fact.
If numbers continue to decline, this highly valuable sport fishery may be in danger of collapse. Taxonomy note: Several times throughout the history of studying marine fishes, researchers have divided the blue marlin into multiple species, but recent genetic studies leads scientists to believe that all blue marlin around the world are the same species. Their ventral, or underside, by contrast, is a silver-white color.
Their most remarkable feature is their pronounced upper jaw, which extends to a sharp, spear-like bill. This is long, sturdy, and used to wound prey. The belly of the blue martin is flanked by blue stripes.
The exception is the membrane of the dorsal fin, which is dark blue and unmarked. Blue marlins have four fins; two dorsal and two anal. These are brown with a silver tinge. They are large, and connected to the Atlantic blue marlin by supportive rays.
The rays themselves are spiked and spiny. The number of supportive rays varies based on the fin; the first dorsal fin anywhere from rays, whereas the second dorsal fin has a mere six or seven. The pectoral fins, found on the sides of the Atlantic blue marlin, can be brought flush against the body of the marlin.
They are elongated and narrow. It also possesses 24 vertebrae that help facilitate rapid swimming through ocean currents and water more generally. The average Atlantic Blue Marlin lives for 27 years. Just as the female Blue Marlin is bigger than the male, she also tends to outlive her male counterpart, some by as much as 10 years.
A male Atlantic Blue Marlin can expect to live up to 18 years. The female Atlantic blue marlin reaches sexual maturity once she achieves a weight of lbs, whereas the males take three years to fully sexually mature. Once matured, the female lays up to 7, eggs over the course of the mating season.
At this stage, they have no bill; this develops with maturity. Typically the Atlantic blue marlin spawns near Cuba. This transpires between the months of May and November.
The larvae then hatch a week after spawning. Atlantic Blue Marlins prefer the deep water of the outer ocean for swimming and living in. Scientists call this bluewater. Blue marlins naturally gravitate towards the warmer, more tropical waters of the Indian, Pacific and Atlantic Oceans, where they swim close to the surface. They can live in these tropical environs year round but can also be highly migratory, following ocean currents and hunting for schools of surface-swimming fish.
Typically the Atlantic blue marlin will move towards the equator during the winter and away again during the summer. Because the blue marlin prefers warm, surface water, it predominantly eats surface-dwelling fish such as tuna and mackerel. Are blue marlins edible? How do blue marlins survive? Do blue marlins live alone? What are the blue marlins breathing organs? What is the blue marlins weight? What do blue marlins eat? What is the habitat of a blue marlin?
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