RT Report
T1 Methods of Measuring Stock other than by the Use of Commercial Catch and Effort Data: FAO Fisheries Technical Paper No. 176
A1 Food and Agriculture Organization of the United Nations, 
A1 Institute of Marine Research, 
A1 United Nations Environment Programme, 
K1 fish
K1 aerial survey
K1 fishing vessel
SN 92-5-100397-1
YR 1977
FD 1977
LK https://wedocs.unep.org/handle/20.500.11822/29853
UL https://wedocs.unep.org/handle/20.500.11822/29853
NO This paper reviews methods of monitoring the abundance of fish stocks other than by the analysis of catch and effort data. The main methods considered are: fishing surveys; acoustics, sightings and aerial surveys; egg and larval surveys; and tagging experiments. For each method consideration is given to the precision obtained, the possible causes of bias, and the costs involved. A tabulation is given of the advantages and disadvantages of different methods in respect of different types of stock. The ultimate choice of method depends on the biological and environmental characteristics of the situation, as well as the specific purpose of the work, and the resources of personnel, expertise and equipment that are available.
DS UN Environment Document Repository
RD Sep 18, 2026