The fish map represents an instrument available for provincial administrations intent on understanding the territory, laying the groundwork for the definition of efficacious management strategies.
The result of a fish map is the study of aptness of fauna, the state of aquatic fauna, the potential productivity, biological quality and the integrity of the fluvial ecosystem.
Normally there are first and second level fish maps.
A first level fish map is the result of a qualitiative analysis sufficient to describe efficaciously the reality of the provincial territory.
The determination of the experimental sampling plan and in particular the choice of the number and siting of the sampling stations must be based on the following principles:
Guarantee the most homogeneous coverage of the different hydrographic basins and of the reclamation areas.
describe the different ecological contexts in the provincial territory.
Represent the managerial situation (protected areas or areas under particular fishing regimes)
produce information about situations of particular managerial interest communicated by the provincial authorities
the objective of a second level fish map is to provide more detailed information about environmental situations of particular interest gathered on the first level fish map and lay the basis for bio-monitoring activity in the strategic areas pinpointed on the territory.
- Phases of sampling
- capture of the animals
- sampling with portable electrostunner
- keeping the fish in baths
the captured animals are kept in a series of baths with a constant flow of freshwater thanks to a generator-powered pump.
This system allows a significant number of animals to be held pending further operations
the classification and collection of the morphometric parameters of the sample animals, following their anaesthesetization and a possible biopsy.
Collection of environmental data
geomorphological-naruralistic description of the sample site, of the type of watercourse and surveying of any possible altered situations or ecological disturbance.