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Integrated Analysis of Data from MRC Fisheries Monitoring Programmes in the Lower Mekong Basin

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Integrated Analysis of Data from MRC Fisheries Monitoring Programmes in the Lower Mekong Basin ISSN: 1683-1489 Mekong River Commission Integrated Analysis of Data from MRC Fisheries Monitoring Programmes in the Lower Mekong Basin MRC Technical Paper No. 33 August 2013 . Cambodia Lao PDR Thailand Viet Nam Page 1 For sustainable development Mekong River Commission Integrated Analysis of Data from MRC Fisheries Monitoring Programmes in the Lower Mekong Basin MRC Technical Paper No. 33 August 2013 Published in Phnom Penh, Cambodia in July 2013 by the Mekong River Commission Cite this document as: Halls, A.S.; Paxton, B.R.; Hall, N.; Hortle, K.G.; So, N.; Chea, T.; Chheng, P.; Putrea, S.; Lieng, S.; Peng Bun, N.; Pengby, N.; Chan, S.; Vu, V.A.; Nguyen Nguyen, D.; Doan, V.T., Sinthavong, V.; Douangkham, S.; Vannaxay, S.; Renu, S.; Suntornratana, U.; Tiwarat, T. and Boonsong, S. (2013). Integrated Analysis of Data from MRC Fisheries Monitoring Programmes in the Lower Mekong Basin. MRC Technical Paper No. 33, Mekong River Commission, Phnom Penh, Cambodia, 130pp. ISSN: 1683-1489. The opinions and interpretations expressed within are those of the authors and do not necessarily reflect the views of the Mekong River Commission. Cover Photo: J. Garrison Editors: T. Hacker, T.R. Meadley and P. Degen Graphic design and layout: C. Chhut Office of the Secretariat in Phnom Penh (OSP) Office of the Secretariat in Vientiane (OSV) 576 National Road, #2, Chak Angre Krom, Office of the Chief Executive Officer P.O. Box 623, 184 Fa Ngoum Road, P.O. Box 6101, Phnom Penh, Cambodia Vientiane, Lao PDR Tel. (855-23) 425 353 Tel. (856-21) 263 263 Fax. (855-23) 425 363 Fax. (856-21) 263 264 © Mekong River Commission E-mail: [email protected] Website: www.mrcmekong.org Table of contents List of Tables ........ ...................................................................................................................................v List of Figures ...... ................................................................................................................................ vii Abbreviations and Acronyms.. ............................................................................................................... xi Glossary of parameters ......................................................................................................................... xii Glossary ............................ .................................................................................................................. xiii Acknowledgements ............................................................................................................................. xvi Summary .............. .............................................................................................................................. xvii 1. Introduction .... ....................................................................................................................................1 1.1 Background ..............................................................................................................................1 1.2 The aims of the paper ...............................................................................................................2 1.3 Relevance to FEVM Logframe Outputs and Activities ............................................................2 1.4 Structure of the paper ...............................................................................................................2 2 The Cambodian Dai Fishery Monitoring Programme .......................................................................3 2.1 Introduction ..............................................................................................................................3 2.2 Description of the fishery .........................................................................................................3 2.3 Monitoring programmes ..........................................................................................................5 2.4 Status and trends of resources ..................................................................................................6 2.4.1 Catch composition .......................................................................................................6 2.4.2 Trends in species composition and diversity ...............................................................7 2.4.3 Trends in catch, indices of abundance and biomass and fish size (weight) .................7 2.5 Hydrological influences ..........................................................................................................10 2.6 Management effects ...............................................................................................................11 2.7 Conclusions ............................................................................................................................11 3. The Lao Lee Trap Fishery Monitoring Programme .........................................................................13 3.1 Introduction ............................................................................................................................13 3.2 Description of the fishery .......................................................................................................13 3.3 Monitoring programmes ........................................................................................................13 3.4 Status and trends ....................................................................................................................17 3.4.1 Catch composition .....................................................................................................17 3.4.2 Trends in species composition and diversity .............................................................17 3.4.3 Inter-annual variation in relative biomass and hydrological effects ..........................17 3.4.4 Intra-annual variation and hydrological effects .........................................................20 3.5 Conclusions ............................................................................................................................23 4. Fish Abundance and Diversity Monitoring Programmes (Small-Scale Artisanal Fisheries)............25 iii Integrated Analysis of Data from MRC Fisheries Monitoring Programmes in the Lower Mekong Basin 4.1 Introduction ............................................................................................................................25 4.2 Monitoring programmes .........................................................................................................25 4.3 Resource status and trends .....................................................................................................30 4.3.1 Species composition ..................................................................................................30 4.3.2 Trends in species diversity ........................................................................................31 4.3.3 Trends in relative fish abundance and biomass indices .............................................36 4.3.4 Trends in growth .......................................................................................................38 4.3.5 Abundance, biomass, growth and flooding ...............................................................41 4.3.6 Other sites and species-wise analyses ........................................................................41 4.4 Conclusions .............................................................................................................................41 5. Larvae Density Monitoring Programme ...........................................................................................45 5.1 Introduction ............................................................................................................................45 5.2 Monitoring programmes .........................................................................................................45 5.3 Status and trends .....................................................................................................................47 5.3.1 Species composition ..................................................................................................47 5.3.2 Trends (all species) ....................................................................................................49 5.3.3 Trends by species .......................................................................................................52 5.4 Origin of ichthyoplankton drift ..............................................................................................57 5.5 Summary and conclusions ......................................................................................................57 6. Integrated analyses ...........................................................................................................................61 6.1 Introduction ............................................................................................................................61 6.2 Methodology ...........................................................................................................................62 6.2.1 The timing and extent of fish migrations ...................................................................62 6.2.2 Spawning locations ....................................................................................................62 6.2.3 Recruitment effects on stocks migrating from the TS-GL .........................................63
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