N_sigma_bs

N_sigma_bs is an analysis variable useful for the purposes of biomass estimation.

Let D be the domain over which the sample mean is to be calculated.

Then N_sigma_bs is calculated as follows:

Where:

N    = Number of fish in the domain D (-)
s
bs = Expected backscattering cross-section of an individual fish in the domain D (m2)
s
v   = The linear mean Sv for all samples in the domain D (m2/m3)
V
   = the integration volume (m3)
and
Sv_mean
and Volume_integration are the respective analysis variables with those names.  

See also

About biomass estimation
About analysis domains

Samples