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The biggest fish on Earth are girls

September 16th, 2020 at 11:18 PM
whale sharks
  • Scientists discovered that whale sharks grow differently based on their gender.
  • Male sharks grow faster than females, but females ultimately get much, much larger than their male counterparts.
  • Female whale sharks can reach a maximum size of around 46 feet in length.

There are many different types of fish in the world’s oceans. Species vary greatly in everything from color to appetite to size, but the mighty whale shark has long been considered the biggest. Whale sharks aren’t actually whales at all, of course, as that would make them mammals and not fish, but a new study reveals that gender plays a big role in how large a whale shark can get.

The study, which was published in Frontiers in Marine Science, utilizes decades worth of data to reveal how both male and female whale sharks grow. As it turns out, male whale sharks grow faster, which may be advantageous, but female whale sharks are capable of growing much, much larger.

The researchers discovered that male whale sharks tend to peak at around nine meters in length or about 30 feet. That’s an incredibly huge fish, but the ladies of the species are even more impressive. Females tend to grow to an average length of roughly 14 meters or 46 feet before they stop growing. Yeah, that’s a seriously large fish, but they don’t reach that size quickly.

“That’s absolutely huge – about the size of a bendy bus on a city street,” Dr. Mark Meekan, lead author of the study, said in a statement. “But even though they’re big, they’re growing very, very slowly. It’s only about 20cm or 30cm a year.”

It takes a very long time for the sharks to reach their maximum size. The researchers tracked a whopping 54 different whale sharks as they matured in the oceans, occasionally observing them and using their unique patterns to identify and differentiate them.

Okay, so the female whale sharks grow mega-huge, but why? Well, while male sharks may benefit from growing a bit faster, the female sharks being much larger benefits them when it comes to protection from predators, especially when they’re carrying offspring.

“Only one pregnant whale shark had ever been found, and she had 300 young inside her,” Dr. Meekan said. “That’s a remarkable number, most sharks would only have somewhere between two and a dozen. So these giant females are probably getting big because of the need to carry a whole lot of pups.”

Carrying around 300 smaller versions of yourself would definitely be easier if you were 46 feet tall, so I suppose that makes a good bit of sense. Still, the discovery is a bit of a shock for scientists, as it was thought that the sharks don’t really hit a size limit during their long, slow-growing lives.

Mike Wehner has reported on technology and video games for the past decade, covering breaking news and trends in VR, wearables, smartphones, and future tech.

Most recently, Mike served as Tech Editor at The Daily Dot, and has been featured in USA Today, Time.com, and countless other web and print outlets. His love of reporting is second only to his gaming addiction.




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