This manual defines methods for estimating selectivity of gillnet and longline gears, with particular reference to the use of these gears in abundance surveys. The manual illustrates how gear design, the basic concepts of size selection and fish morphometric data can be used to model selectivity. Statistical estimation methods are described in detail, and examples given of their application in spreadsheets. The efficient use of these gears in abundance and research surveys is also discussed. Although the manual concentrates on gillnets and longlines, the methods given are general enough to be relevant to any research involving gear selectivityThe present section provides a very basic description of gillnets and longlines. Section 7 provides more detail on important parameters and ways of rigging, which are reviewed with respect to their influence on selection and catch rates.
|Title||:||Manual on Estimation of Selectivity for Gillnet and Longline Gears in Abundance Surveys|
|Author||:||Holger Hovgård, Hans Lassen|
|Publisher||:||Food & Agriculture Org. - 2000|