Which fish has the biggest and heaviest brain?

Fun Facts

• The sperm whale has the biggest brain of any animal species, weighing up to 20 pounds (7 to 9 kilograms).
• Larger brains don’t necessarily make a smarter mammal.
• The nocturnal tarsier is only 3.5 inches tall, but it has the largest eyes relative to body size of any mammal.

Do big fish have big brains?

Fish typically have quite small brains relative to body size compared with other vertebrates, typically one-fifteenth the brain mass of a similarly sized bird or mammal.

Which fish is so much intelligent?

Mantas has a brain that’s larger than most fish. Hence, it is considered by many to be the smartest fish in the world. The goldfish is also tagged as the world’s smartest fish.

What size brain do fish have?

While goldfish do have brains, their brains are not exactly huge! A goldfish’s brain is about the same size as its eye. When you compare that to a human brain, you’ll realise that proportional to their body size the goldfish brain is really quite small. This is the same for most types of fish.