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Book (series)Size-based assessment of data-limited inland fish stocks – Review and applications 2020
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No results found.Assessment of data-limited fish stocks is a rapidly evolving topic in marine fisheries, and is supported by an increasing focus on the socio-economic and ecological importance of small-scale fisheries. The challenges in such systems can be compounded in inland fisheries, which are often complex, spatially dispersed and difficult to monitor. This publication reviews the application of empirical indicators and simple size-based models usually used in marine fisheries, but also applicable in inland systems. It presents case study applications for important fisheries in the Amazon River (Brazil), Tonlé Sap River (Cambodia), Paraná River (Argentina) and Lago Bayano (Panama). These studies consider issues including spatial separation of life-history stages, strong modality in population size structure, and fishing gear selectivity. Local scientific experts interpreted trends in stock state. Empirical indicators showed strong decline in size structure and relative abundance for one of the four assessed Tonlé Sap stocks. The length-based spawning potential ratio model suggested that two of the three assessed Amazon Goliath catfish stocks, and the sábalo stock in the Paraná River, were below sustainable spawning potential ratio reference points. The Lago Bayano tilapia stock appeared healthy. The review concludes that data-limited assessment methods developed for marine stocks may provide guidance for the sustainable management of important target species in inland fisheries. The methods tested are probably less applicable in non-selective fisheries where small species are preferred, or in river fisheries with extreme dependence on flood pulses. Important considerations are species life history and spatial distribution, environmental variability, and fishery sampling strategy. -
Book (stand-alone)Building awareness in aspects of fishery statistics, stock assessment and management. proceedings of the FAO/SEAFDEC regional training workshop on the use of statistics and other information for stock assessment. 2002
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No results found.An account of the FAO/SEAFDEC workshop, this document includes a brief account of the fishery statistics programme undertaken by the FAO Fishery Information, Data and Statistics Unit. Catch statistics from the FAO database are provided for each country along with comments relevant to the quality of the statistics. Fish stock assessment initiatives in the region are briefly reviewed. This is followed by an introduction to spreadsheet applications of the Thompson and Bell’s approach to assessing f ishery performance and on the use of trophic models as applied in the aquatic ecosystem off the southwest of India. Issues concerning fishery management are also discussed. These include a brief review on marine fisheries management in the region, and suggested approaches to achieving better linkages between research and management. The latter include formalizing the linkages through legally empowered fisheries management plans, and fishing community / industry / government co-financing of fishe ries research and management. -
Book (series)Manual on sample-based data collection for fisheries assessment. Examples from Viet Nam. 2000
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No results found.This manual deals with the practical implementation of a routine data collection programme. The data collection programme is developed through a top-down approach, from the identification of the objectives down to the practical recording and management of data obtained from the fishery. The issues are dealt with both through detailed discussion and by using simple examples. The examples are mostly based on situations in tropical fisheries, and in particular, experience has been drawn from develo ping a data collection programme in Viet Nam. The main questions addressed in the manual are which fisheries data to collect, where and when to collect them. Only data collected from commercial marine capture fisheries are considered (data from freshwater fisheries, cultured fish and experimental fishery are excluded). The methodologies used are mainly appropriate for a tropical, developing country, with many small (artisanal) vessels and a few large (industrial) vessels. The methodology is the “sample-based approach” - the manual does not deal with a methodology which assumes complete enumeration. The data collection methodology presented attempts to utilize whatever information can be obtained in practice in a developing country. Processing and storing of data (fisheries databases) and staff training are partly covered.
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