How do u measure a fish's volume?

Question

besides using displacement?

Answer 1

thats probablly the only way possible....
unless you know the density of the fish: you could work it backward, yet it's highly unpractical due to the fact that different fish have different densities..

i mean, you could scan it using a 3D laser scanner and plot it in a CAD program..... but thats a waste of time.

Answer 2

You would have to take a large number of dimentional measurements to assess vlume if you couldn't use displacement. The more measurements you took, the more accurate your estimate would be.