Finally, the
development related to the size and amount of different
fishing gears are included as a factor itself, e.g. the size
of the trawl, number of hooks, etc. If we combine the
technical specifications for all shrimp trawlers from
different time periods (1990 and 2002), we are able to
create an integrated measure of the relationshipbetween
the development of number of vessels and the increase in
catch capacity