Consumers: at the level where the products are finally consumed.
In many cases, there is a natural way to collect particular variables.
For example, relatively static variables, like vessel length or engine size, are often best collected through a registration system.
Numbers in brackets refer to relevant sections in the main text.
It is important to assess the degree of precision required for the measurement of each variable.
The choice of method is influenced by the data collection strategy, the type of variable, the accuracy required, the collection point and the skill of the enumerator.
Links between a variable, its source and practical methods for its collection (Table 6.1, Table 6.2 and Table 6.3) can help in choosing appropriate methods.
In almost all cases, many different variables can be collected simultaneously.
For example, length frequency, species composition, average weight and first sale price can all be obtained when vessels land their catch.
It would include various agencies outside of fisheries (e.g. Support industry: industries which provide materials and services for fisheries, but are not directly involved in fisheries business (e.g. The linkage between variables, sources and methods are shown in three tables.
These tables intend to give some guidance for selecting collecting methods and sources, and design a data collection system.
For example, for a large-scale fishery, catch data would be best collected from logbooks, whilst in a small-scale fishery interviews and/or questionnaires would often be the best method.