Fishes are ectothermic in nature which helps them to adapt body temperature according to the environment, due to which except Tuna, mackerel sharks, and Opah fish all fishes are cold-blooded species.
Dwarf goby fish or Paedocypris petrogenetic is the world’s smallest fish who is a male and measures 7.9 mm and has a lifespan of 60 days.
except sharks no fishes have eyelids instead, they have a specialized membrane in their eye which enables them to protect their eyes.
Fishes have excellent body language, sounds, scents, electrical pulses, and motions which enables them to have excellent communication skills.
Fishes are the oldest creatures on this planet and have existed for over 530 million years, much older than the period when dinosaurs roamed the Earth.
Fishes are extremely intelligent as they have various skills such as problem solving,recognising the scent of their home streams and many more.
When we think of big fishes like sharks or whales we all think of danger,but the world's largest whale shark (Rhincodon typus) that is over 65 feet and weighs nearly 40 tonnes is a harmless creature.