The answer is that you have to make up example on how to track the fish like you have to tag the fish or track them with a recognition camera, the camera recognizes unique appearances in the fish and count how many there are, basically just give examples on how to track the number of fish.

a motor homunculus represents a map of brain areas dedicated to motor processing for different anatomical divisions of the body.

homunculus represents the importance of various parts of your body as seen by your brain. as a result, they take up a lot of brain space. although the cortical homunculus is a curiosity, penfield's work in mapping the brain's relationship to the body was invaluable.

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.