Fish Population Dynamic and Stock Assessment

5.1.7. General information needed

Before starting the work at sea, preliminary information must be collected regarding the

fishery. Information on the following points should be collected:

· Fish populations (species composition, distribution and abundance, seasonal variations, by-catch)

· Fishing grounds (location, fishing yields, type of bottom, presence of other static gear in the area)

· Types of vessels used (main characteristics, bridge and deck equipment)

· Net handling techniques

· Duration of fishing trips

The main sources for this type of information are the fishermen themselves, the fish landings at local ports, or historic information from national databases. Scientific information, if available, must also be collected regarding these parameters and others, such as:

· Fish growth for the main species

· Fish behaviour towards the gear

· Characterisation of the area in terms of environmental conditions