SBPRfunc calculate spaning biomass per recruit based on
parameters
1  | SBPRfunc(F, Rzero, NatM, vuln, mature, weight, LenAtAge, MaxAge)
 | 
Rzero | 
 recruitment at eq  | 
NatM | 
 natural mortality  | 
vuln | 
 vulnerability to fishing  | 
mature | 
 maturity at age  | 
weight | 
 weight at age  | 
LenAtAge | 
 length at age  | 
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