Fish Population Dynamic and Stock Assessment

1.5.5. Basic elements for the description of a fishery

Basic elements for the description of a fishery

a. The input data, namely fishing effort. (Fishing effort is the product of the amount of gear in use times the duration of fishing activity.)

Examples are – Trawling hours, trap days, diving hours, hook hours etc.

b. The output data i.e. fish landed in fish landing centres and

c. Process which link the input and output data. Usually processes consist of biological process and the fishing operations.

Models are processes that connect input and output data. Prediction could be made possible by processing input data by using models.  In general stock assessment models are grouped into two.

1. Analytical model

2. Holistic model (eg. surplus production model, box model, swept area method)