Fish is a vertebrate animal that lives in water. Vertebrate means they have a spinal cord surrounded by bone or cartilage. There are more than 30,000 species of the fish. They breathe air, at least part time, using their gills. They have a streamlined body and use fins for swimming. They have a pointed snout. There are three major types of fishes- Jawless fish, Cartilaginous and Bony fish.
Quick Facts: –
- Some flatfish use camouflage to hide themselves on the ocean floor.
- Tuna fish can swim at speed of up to 70 kph.
- Relative to their body size, they have small brains.
- Cleaner fish help out other fish by removing parasites and dead skin from their scales.
- They live in nearly every large water body in the world including streams, rivers, ponds, lakes and oceans.
- Most fish are color blind.
- Some fish live on the surface of water and some live in the very depth of the ocean.
- A group of fish is called School.
- The biggest fish is the ocean sunfish which can weigh around 5000 pounds.
- The longest fish is the whale shark which can grow up to 40 feet long.
- The smallest fish is the dwarf goby which is only 9 mm long.
- Many fish have an internal air bladder that helps them to stay afloat. Those that don’t, like sharks, must swim or they will sink.
- Fish are cold-blooded with an exception of Tuna family and the Mackerel shark family.
- Most fish have a skeleton made of bones but some, like sharks, have a skeleton made of cartilage.