Generally speaking,fish have small brains in relationship to their overall body weight. Elasmobranchs(Sharks and Rays) in general have a slightly larger brain for the same body mass as Teleosts (Bony Fish).
People also ask
Do fish have a brain and nervous system?
The Brain and Nervous System of Fish Being highly complex life forms, fish need a brain and a nervous system to control their body actions. The nervous system of fish (much like ours) is composed of a central co-ordinating brain, a spinal cord and many, many nerves.
Do starfish have brains?
The starfish do not have a brain, but they are not fools. They have a complex nervous system that allows them to make a decision. This nervous system is centralized in the ring around the mouth. You must have thought that starfish spends all of its life by just sticking on a single rock. But in reality, that is not the case.
What is the average brain size of a fish?
Meaning a 5 kilo specimen would have a 6.5 gram brain, still its is a pretty dumb fish. Most fish have brains that are less than 1 percent of their body weight, but not all. At the other end of the continuum of fish intelligence is the electric Elephantnose fish.
Do jellyfish have brains?
Instead of having a brain, they have basic sensors and a simple nervous system. Let take a look at the animals without a brain. The jellyfish family tree it called 渏ellies?