Baremore et al Gillnet selectivity for juvenile Carcharhmus hmbatus 
237 
FL (cm) 
FL (cm) 
Figure 4 
Selectivity curves for the normal proportional spread model where fishing intensity is 
assumed to be proportional to mesh size. Curves were plotted with observed data on 
frequency of fork lengths (FL) for blacktip sharks ( Carcharhmus limbatus) caught in 
the Gulf of Mexico Shark Pupping and Nursery (GULFSPAN) survey. Selectivity curves 
and length frequencies are plotted separately by mesh size. Relative retention is the 
probability that a fish of a given length class that comes into contact with that mesh 
size is captured. 
