00957nam a2200205Ia 4500 CTU_40328 210402s9999 xx 000 0 und d 639 F533/N397 Holger Hovgard FAO fisheries technical paper; N397 Manual estimation of selectivity for gillnet and longline gears in abundance surveys Holger Hovgard, FAO, Hans Lassen Rome FAO 2000 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 covers how to gear design, the basic concepts of size selection and fish morphometric data might be used detail and examples given of their application in speadsheets. fisheries Nguyễn Quang Điền, 010228 Trung tâm Học liệu Trường Đại học Cần Thơ