![]() What scientists want to learn next is how being able to thrive in fresh water helps bull sharks survive. No fresh water sharks, unless you live near the ocean, there are a few that swim up in rivers, from the sea, but they head back out, they are mostly Bull. ![]() To cope with this change, bull sharks reduce the amount of urea in their body, and their kidneys work overtime, excreting about 20 times more urine - but much less salt - than when they are in salt water.īull sharks use a lot of energy to keep up this balancing act. When a bull shark ventures into bays, rivers or lakes, it faces the opposite problem: It must retain vital salt while getting rid of excess fresh water. They have a tolerance for fresh water that is unique among marine sharks, and can travel far up rivers, posing a threat to those who venture into the water. They also have a special organ that excretes excess salt they absorb from sea water. No relation to marine sharks, these curious fish make a wonderful addition to the semi-aggressive aquarium by adding a great deal of personality and character. To keep from losing water and dehydrating in the salty sea, sharks maintain high levels of a substance called urea in their bodies. Freshwater Sharks Freshwater Sharks prefer aquariums that contain several hiding spaces, along with driftwood and larger thick leaved plants. They are usually found in brackish waters, but are a migratory species that will travel many miles inland to fresh water. ![]() To survive in the ocean, sharks must maintain the proper balance of salts and water inside their bodies - a process called osmoregulation. Glo Sharks (Cosmic Blue, Galactic Purple, and Electric Green) 5. Bull sharks have been found more than 2,000 miles up the Amazon River! Scientists once thought a population of bull sharks in Lake Nicaragua was a separate species, they discovered that the sharks swim back and forth to the ocean through rivers and estuaries. Top 15 Freshwater Sharks for home aquariums 1. Credit: Wikipedia.īulky-bodied bull sharks are found in shallow coastal waters throughout the world, but they can journey quite far from the ocean. Bull sharks are known for their ability to thrive in fresh water. There exists freshwater sharks which are capable of surviving in fresh water lakes and rivers.
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