How do fish weigh them selfs?

Fish don't have scales or any internal mechanisms to weigh themselves. They don't have a concept of weight in the same way humans do.

Here's why:

* No need for self-awareness of weight: Fish don't need to know their own weight for survival in the water. They rely on buoyancy and water pressure to navigate and move.

* Weight is relative in water: The weight of a fish is less important than its density and how it interacts with the surrounding water.

* No tools for measurement: Fish lack the tools to measure their own weight, like scales or internal sensors.

How we weigh fish:

* Fish scales: We use scales to measure the weight of fish, but they are external tools and not something the fish uses themselves.

* Displacement method: Scientists can use a displacement method to estimate the weight of fish in the wild. This involves measuring the volume of water a fish displaces when submerged.

* Sonar: Sonar technology can be used to estimate the size and weight of fish in the ocean.

So, in short, fish don't weigh themselves; they simply live their lives in a world governed by buoyancy and water pressure!