What is ecological density, crude density and population density ?

Explanation

i. Ecological density : It is the size of a population in relation to the numbers per unit of habitat space. (Available are or volume that can be colonized by a population). Eg. 1000 fish in the volume of water in the pond.
i. Crude density : It is the size of a population in relation to the numbers per unit of total space. Eg. 1000 fish in a pond.
ii. Population density : It is usually experssed as the number of individuals per unit area or volume. Eg. 100 trees per acre.