The black fin shark is another name for the Columbian shark, a catfish of the Ariidae family with a high fin and long whiskers. Very popular in aquariums, the fish is native to the warm, tropical coastal and river waters around Central and South America.
The fish is often between 2 and 4 inches when purchased, and it grows to lengths of 10 to 20 inches in larger tanks. More active than other aquarium catfish, the Columbian shark prefers an environment with at least some saltwater, as they live in both fresh and saltwater conditions in the wild at various times. They may be fed bloodworms and sinking catfish pellets, and they also survive on scraps and algae found at the bottom of the tank.Learn More
While goldfish are capable of surviving in a variety of temperatures, they do best between 65 and 72 degrees Fahrenheit. Once temperatures get below 50 degrees Fahrenheit, goldfish go into hibernation and can potentially die.Full Answer >
Seahorses are the only fish to have prehensile tails. The seahorse uses the prehensile tail to anchor itself to the sea floor, using it to latch on to sea grass and coral during water turbulence and while eating, according to National Geographic. AskNature.org reports that the prehensile tail exhibits both strength and flexibility due to the seahorse's muscle structure and the rigidity of its dermal plates.Full Answer >
One of the rarest fish in the world is the Devils Hole pupfish. In April 2013, it was estimated that only 35 of these fish were left in the wild. Though that number has since increased slightly, the natural population of the Devils Hole pupfish has rarely been measured at over 500, even in the autumn when the population peaks.Full Answer >
Sardine is a generic term used to refer to small, silvery saltwater fish that are related to the herring and are found worldwide. Anchovy refers to a family of small fish found in the Mediterranean Sea, Black Sea and Atlantic and Pacific coasts.Full Answer >