Ehrhardt and Deleveaux: Fishing capacity in a trap fishery for Panulirus argus 
191 
Figure 5 
Average Florida regional monthly revenues per trap-fishing vessel under (A) the 1991 spiny lobster (Panulirus argus) 
high abundance and lowest q (o) and the 2001 lowest abundance and highest q (•); (B) the 2001 lowest abundance and 
highest q (•) and a simulated condition of the 2001 abundance subjected to the 1991 lowest q (O), and (C) the 2001 lowest 
abundance and highest q and the 1997 abundance and the intermediate q estimated for that season. 
dance under the exploitation of the catchability coef- 
ficients before the TCP (the 1991-92 fishing season) 
and the actual 2001-02 catchability (Fig. 5B). In the 
absence of the TCP, the revenues per vessel would have 
been close to zero by November, and negative starting 
in December, resulting in total seasonal revenues of 
only $1,470 instead of the $13,405 that was actually 
obtained due to the increased CPUE that resulted as a 
consequence of the TCP implementation. 
In the case scenario corresponding to the highest fish- 
ing season stock abundance observed during the study 
period (1997-98), the reduced number of traps generat- 
ed an intermediate value of q\ hence, the total seasonal 
revenue for the 1997-98 scenario was $42,468 com- 
pared with $13,405 for the 2001-02 scenario (Fig. 50. 
If the reduced number of traps of the 2001-02 season 
had existed in the 1997-98 fishing season, the annual 
expected revenue under the 1997-98 stock abundance 
would have been $51,608. 
Regional analysis Direct costs were calculated on a per 
trap day per trip condition for each region. The total 
costs (direct and indirect) per trip show a significant 
decreasing trend from Key West (including the Dry 
Tortugas) through the Upper Keys, and Miami shows 
an intermediate total cost per trip. The total cost per 
trap day per trip varied among the regions because of 
the different number of traps serviced per trip in each 
of the regions and hence the total cost per trap day per 
trip did not follow a marked regional trend. 
