Honda and others
The boat ramp surveys that Fisheries Queensland (=DPI Fisheries) is running at the moment have been happening routinely since early 2007. Their primary goal is to collect data on the length of certain species being caught. Lots of other boat ramp surveys have happened over time, with different goals, and they haven't always been run by Fisheries (=DPI Fisheries).
There is an overview about the overall program, of which boat ramp surveys are a subset, on the following web page
http://www.dpi.qld.gov.au/28_12885.htm
It has some information about which species are measured at the boat ramp. There is a general statement about how the data are used, but if you want more info then here is some more reading:
http://www.dpi.qld.gov.au/28_16916.htm (biological data (especially age of fish being caught) are considered during the workshops)
http://www.dpi.qld.gov.au/28_11062.htm (the data are used in periodic stock assessments)
Jonathan.