Sample-based fishery surveys: a technical handbook
Food and Agriculture Organization of the United Nations, 2002 - Business & Economics - 132 pages
The purpose of this handbook is to summarize experience gained over recent years in fishery statistical development by the Fishery Information, Data and Statistics Unit (FIDI) of FAO, and provide planners and users of fishery surveys with simple and step-by-step guidance for developing and implementing cost-effective and sustainable fishery surveys. The methodological and operational concepts discussed here apply equally to marine and inland capture fisheries and are presented in a manner that is generic enough to make them adaptable to most commonly used data collection systems.
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CONCEPTS IN ESTIMATING CATCH
CONCEPTS IN ESTIMATING EFFORT
GENERAL SAMPLING CONSIDERATIONS
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accuracy and precision accuracy level active boats Active Days Survey applications software basic fishery data basis Beach Boat Activity Coefficient Boat Activity Survey boat-days boat/gear category boat/gear type catch by species census approach collectors computed confidence limits data collection database Dzemenl estimated catch estimated effort estimated total catch estimation context estimation process fishery statistical fishing activities fishing gear fishing sites fishing units formulated Frame Survey data Gillnets implementation indicators landing sites Landings Surveys ln this example ln this section methodological and operational month MOTORISED number of boats number of days number of fishing overall CPUE parameters primary data raising factor recording Round Sardinella safe sample sizes sample effort sample-based fishery surveys sampling day Sampling requirements sampling sites species composition Statistics Unit strata stratification SUMMARY ln survey standards Surveys sampling SW Coast target data population total fishing effort Total landing total number traps trawlers users variability