Remora and sharks have a commensalism relationship which, according to the Encyclopedia Britannica, is a relationship between two species in which one benefits from the other without either being harmed. Commonly called a suckerfish, the remora is a pelagic marine fish that attaches to the shark and feeds on it. Unlike parasitic species, the remora does not penetrate the flesh of the shark or otherwise cause it damage.Know More
According to the Animal Diversity Web, an online publication by the University of Michigan, the remora requires the continual travel of the shark and cannot survive in still waters. There are several species of remora, and some have even been found living in the mouths of sharks. Though it is unknown if the sharks consider the remora as undesirable, no remora remains have ever been discovered in the digestive tract of a shark.
Ancient Greek and Roman civilizations believed the remora had magical powers, with the Romans attributing the death of Emperor Caligula to the fish holding back his ship and allowing it to be overtaken by the enemy. Today, remora are used by fishermen around the world as bait. They attach a line to a living species, and, once it has attached to a larger fish or turtle, the fishermen slowly pull in their catch.Learn more about Zoology
Selective breeding, also called artificial selection, is carried out by mating animals or crossing plants with desired characteristics or traits to produce offspring in which those traits are more dominant, according to Encyclopedia Britannica. The breeder attempts to isolate the genes responsible for the desired trait in subsequent generations so the quality becomes more pronounced and fixed.Full Answer >
Most sharks live in the ocean at depths no greater than 7,000 feet; very few sharks live below 10,000 feet. Sharks are found in all the world's oceans, from the Arctic to the Antarctic, and in some rivers and lakes.Full Answer >
According to the National Oceanic and Atmospheric Association (NOAA), sharks are classified as fish. Because sharks live their lives in water and make use of gills to filter oxygen from the water to breathe and survive, they fall under the fish category.Full Answer >
Sharks move through the water with the help of their tail fins. The body of a shark is light as it is made of cartilage and not bones. It has a perfectly streamlined body. Its dorsal fins help it steer through the water.Full Answer >