(Tenualosa Ilisha) in the Ayeyarwady Delta
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DISTRIBUTION AND MIGRATIONS OF HILSA (TENUALOSA ILISHA) IN THE AYEYARWADY DELTA Eric BARAN1, WIN KO KO2, ZI ZA WAH2, Norberto ESTEPA3, SARAY Samadee1, Xavier TEZZO1, KHIN MYAT NWE, Edward MANINGO3 1 WorldFish 2 Myanmar Department of Fisheries, 3 Consultant February 2015 CONTENTS 1 INTRODUCTION ........................................................................................................................................ 1 2 METHODOLOGY ........................................................................................................................................ 3 2.1 Area studied ....................................................................................................................................... 3 2.2 Selection of target species ................................................................................................................. 5 3 OVERALL RESULTS .................................................................................................................................. 6 3.1 Spatiotemporal patterns of Hilsa abundance in the Ayeyarwady Delta ............................................. 6 3.1 Migrations patterns and size of Hilsa individuals in the Ayeyarwady Delta ....................................... 4 4 DETAILED RESULTS ................................................................................................................................. 7 4.1 Pathein route ...................................................................................................................................... 7 4.1.1 Hainggyi Township ......................................................................................................................... 7 4.1.2 Ngapudaw Township ...................................................................................................................... 8 4.1.3 Pathein Township ........................................................................................................................... 8 4.1.4 Thabaung Township ....................................................................................................................... 9 4.1.5 Ngatainchaung Township ............................................................................................................. 10 4.1.6 Ingapu Township .......................................................................................................................... 10 4.2 Ayeyarwady route ............................................................................................................................ 11 4.2.1 Pyinzalu Township ....................................................................................................................... 11 4.2.2 Labutta Township ......................................................................................................................... 12 4.2.3 Bogale Township .......................................................................................................................... 13 4.2.4 Mawgyun Township ..................................................................................................................... 13 4.2.5 Yandoon Township ...................................................................................................................... 14 4.2.6 Danubyu Township....................................................................................................................... 15 4.2.7 Zalun Township ............................................................................................................................ 16 4.2.8 Hintada Township......................................................................................................................... 16 4.2.9 Monyo Township .......................................................................................................................... 17 4.3 Maubin route .................................................................................................................................... 18 4.3.1 Pyapon Township ......................................................................................................................... 18 4.3.2 Kyiaiklat Township........................................................................................................................ 18 4.3.3 Dedaye Township......................................................................................................................... 19 4.3.4 Twantay Township ....................................................................................................................... 20 4.3.5 Maubin Township ......................................................................................................................... 21 5 CONCLUSIONS AND PERSPECTIVES .................................................................................................. 22 6 BIBLIOGRAPHY ....................................................................................................................................... 23 7 ANNEX 1: SURVEY METHODOLOGY .................................................................................................... 24 7.1 Overview .......................................................................................................................................... 24 7.2 Pre-Survey Guidelines. .................................................................................................................... 25 7.2.1 Preparations at the office ............................................................................................................. 25 7.2.2 District meeting ............................................................................................................................. 26 7.2.3 Village Meeting ............................................................................................................................. 26 7.3 Survey Manual ................................................................................................................................. 27 7.3.1 Overview ...................................................................................................................................... 27 7.3.2 FORM A: Survey Identification ..................................................................................................... 28 7.3.3 FORM B: Species List .................................................................................................................. 30 7.3.4 FORM C: Migration, spawning ..................................................................................................... 31 7.3.5 FORM D: Conclusions ................................................................................................................. 35 8 ANNEX 2: SURVEY QUESTIONNAIRE ................................................................................................... 36 9 ANNEX 3: FLIP CHART OF FISHING GEARS ........................................................................................ 44 10 ANNEX 4: FLIP CHART OF SPECIES STUDIED .................................................................................... 53 11 ANNEX 5: OVERVIEW OF CATCHES PER MONTH .............................................................................. 84 1 INTRODUCTION Hilsa (Tenualosa ilisha) is a major fishery resource in the Gulf of Bengal. The stock of this migratory species is shared between multiple countries and this anadromous species breeds inland, where it ascend up to 1,200 km up rivers for spawning (Motwani et al. 1957, Karamchandani 1961). Bangladesh, India, Indonesia, Malaysia, Maldives, Myanmar, Sri Lanka and Thailand are working together through the Bay of Bengal Large Marine Ecosystem (BOBLME) Project. Identifying distribution patterns, migration routes and breeding sites in each country in order to implement adequate management measures in these sites is essential to sustainability of the resource. According to BOBLME (2010), in Myanmar “there is limited information on the Hilsa fishery and no scientific studies on the species or its habitats were reported. Thus the knowledge base to undertake management of the fishery in Myanmar appears limited. This limits the scope of any management plan”. The present collaboration between BOBLME and WorldFish/DoF/MyFish will fill a knowledge gap about Hilsa in Myanmar; it includes two sub-components based on systematic and structured gathering of local knowledge, namely i) seasonal abundance, geographic distribution and migration extent of hilsa in the Ayeyarwady delta, and ii) identification of hilsa inland breeding sites in the Ayeyarwady delta This research will contribute to Component 2 of BOBLME: Coastal/marine natural resources management and sustainable use, in particular its Sub-component 2.3. Collaborative regional fishery assessments and management plans. It will also complement the project “Procedures and methods for continuing assessment of the status of the hilsa resources in Myanmar” by providing information on spawning sites and migration extent, which is not covered by the latter LOA/RAP/2012/36 project and is necessary to ensure access management at critical sites. Last, this project will contribute to a better understanding of connectivity between Hilsa marine stocks and inland reproduction sites ensuring the sustainability of these stocks. We detail in the present report the methodology used, the hilsa seasonal abundance and fish size patterns in 31 townships,