Fish_number represents the number of fish detected in a region (or other applicable analysis domain).

It is calculated as follows:


= Number of fish of species S in the domain.
= Volumetric fish density for species S in the region (fish/m3). See Density_number for method of calculation.
 = The volume of the domain being analyzed/integrated (m
3). See Volume_integration for method of calculation.

Note: Fish_number can only be calculated if Volume_integration can be calculated. If it cannot be calculated a special value will typically be provided instead.

Single beam vs. Multibeam

This variable is only calculated from multibeam data currently and is always exported with analyses.

See also

About biomass estimation

About analysis variables