are octopus fish
Quick Answer. Though it breathes through gills, the octopus is not a fish but a cephalopod marine mollusk. Also, unlike a fish, an octopus is an invertebrate, which means it doesn't have a backbone. It also has three hearts. Though it breathes through gills, the octopus is not a fish but a cephalopod marine mollusk. Also, unlike a fish, an octopus is an invertebrate, which means it doesn't have a backbone. Keeping an octopus in your saltwater aquarium isn't as common as keeping other invertebrates. One reason for this is that many octopus species grow somewhat large. Another reason is that octopuses eat a variety of fish and invertebrates that saltwater aquarists normally like to keep in their aquariums. Though it breathes through gills, the octopus is not a fish but a cephalopod marine mollusk. Also, unlike a fish, an octopus is an invertebrate, which means it doesn't have a backbone. It also has three hearts. Know More. Neither, it is a cephalopod, related to squid and cuttlefish. An octopus is very intelligent and has a highly complex nervous system. It has three hearts, two which pump blood to it's two gills, and one that supplies blood to the rest of it's body. The appendages of octopuses are called arms, not tentacles. Size relative to a 6-ft (2-m) man: The giant Pacific octopus grows bigger and lives longer than any other octopus species. The size record is held by a specimen that was 30 feet (9.1 meters) across and weighed more than 600 pounds (272 kilograms). Size relative to a 6-ft (2-m) man: The giant Pacific octopus grows bigger and lives longer than any other octopus species. The size record is held by a specimen that was 30 feet (9.1 meters) across and weighed more than 600 pounds (272 kilograms). Averages are more like 16 feet (5 meters) and 110 lbs (50 kilograms). Considered the most intelligent of all invertebrates, the common octopus is found in the tropical and temperate waters of the world’s oceans. They can grow to about 4.3 feet (1.3 meters) in length and weigh up to 22 pounds (10 kilograms), although averages are much smaller. Size relative to a 6-ft (2-m) man: The giant Pacific octopus grows bigger and lives longer than any other octopus species. The size record is held by a specimen that was 30 feet (9.1 meters) across and weighed more than 600 pounds (272 kilograms). An octopus is very intelligent and has a highly complex nervous system. It has three hearts, two which pump blood to it's two gills, and one that supplies blood to the rest of it's body. Some are venomous and dangerous to man because of that venom.
No