Nowadays, many projects from the environment area count with the support of 
geospatial technologies. These technologies are related directly to concepts such 
as computer mathematics, statistics and geospatial databases. This project is based 
on this type of technologic development, once it creates an algorithm for the 
dynamic definition of sectors to consult and analyze database from the fishing 
industry. This tool gives, to the specialists in the fishing administration area, 
mainly the ones from the Group of Fishing Studies (Grupo de Estudos Pesqueiros) of 
Centro de Ciências Tecnológicas da Terra e do Mar from Universidade do Vale do 
Itajaí, a mean of dynamic definition of consultations and geospatial analyses. The 
products generated through this tool are themes to visualize points such as the 
fishing effort by area units or the abundance of species. In addition, the project 
uses the internet as a mean of visualizing themes, distributing the information 
among different elements involved with the fishing administration. Handling 
geospatial datum via internet is a challenge for this state of the art in 
geotechnologies. Besides the technologic limitations, the culture of collecting 
datum about fishing activities without the due georeferring contributes to the slow 
development of applications in this field. To respond to the proposal, the 
algorithm was developed in PHP language, utilizing the PHP Mapscript module from 
UMN Mapserver for reading and handling geospatial objects from the PostGIS 
database. For the analysis, the /Kernel/ method, widely used by geospatial analyses 
in resident geographic information systems, was utilized. The project's result was 
incorporated into Mapserver Guarani as a new functionality. The tests made indicate 
the viability of this kind of geospatial analysis via internet, opening new 
perspectives for handling and visualizing geographic data through the Web.