M.Sc. Thesis. Migration and Productivity of Wild Fish in Stung Chinit Reservoir, Kampong Thom Province, Cambodia
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1 Royal University of Agriculture Graduate School of Agricultural Sciences Supported by the French Assistance Project M.Sc. Thesis Migration and Productivity of Wild Fish in Stung Chinit Reservoir, Kampong Thom Province, Cambodia SOK Seyha Tel: Contact Address: 37L, St 271, Teok Laak3 Toul Kork, Phnom Penh Name of Supervisor : Prof. LIM Puy Institution : Institut National Polytechnique. Ecole Nationale Superieure Agronomique de Toulouse (INP/ENSAT) Field : Agronomy, Environment and Eco-toxicology Name of Assistant Institution Field Name of Assistant Institution Field : Dr. SO Nam : Inland Fisheries Research and Development Institute, Fisheries Administration (IFReDI/FA) : Aquaculture and Fisheries Biology : Mr. Chhouk Borin : Faculty of Fisheries, Royal University of Agriculture (FoF/RUA) : Aquaculture and Aquatic Resource Management December
2 ACKNOWLEDGEMENTS I would like to express my deepest and sincere gratitude with heart-felt to my advisor Prof. Dr. LIM Puy for his kindly guided me throughout this work by sacrificing much of his value time amidst the plenty of task he had have. He had deserved my greatest and cordial thanks as this work cannot be completed at all without his invaluable guidance and un-tired support. I also would like to extend my sincere thanks to all the professors and lecturers in Graduate School of Agricultural Science, Royal University of Agriculture, who shared us with the knowledge and experiences. I would like to indicate my sincere thanks to Dr. Igor Besson, Coordinator of the French Assistant Project for Integrated Management of Agricultural and Rural Development (GIDAR) for his kind help and support during my study. Again, I would like to show my deepest gratitude to Prof. Dr. LEK Sovan, Community Ecology, Ecological Modeling, Evolution et Diversité Biologique (EDB), for his data analysis. Finally, I owe warmest thank to my dearest parents, sisters and brothers for their supplement support in my research. 2
3 Migration and Productivity of Wild Fish in Stung Chinit Reservoir, Kampong Thom Province Sok Seyha 1, Lim Puy 2, So Nam 3, Chouk Borin 1 1 Royal University of Agriculture, Phnom Penh Cambodia; 2 Ecole Nationale Superieure Agronomique de Toulouse, Toulouse, France; 3 Inland Fisheries Research and Development Institute, Fisheries Administration, Phnom Penh, Cambodia ABSTRACT The main purposes of this study were (i) to monitor fish pass after fish ladder built on Stung Chinit diversion weir to allow fish migration and (ii) to observe wild fish productivity (yield and biomass) on which depends an important part of the local population s consumption. The appropriate method in the study was collecting data from fish ladder structure and from fishermen logbook in the reservoir and downstream. The fish ladder was the first structure in Kompong Thom province, Cambodia. It was built in 2005 to allow fish migrate from downstream to upstream. Fish ladder has 43 pools. Fish migration in fish ladder was monitored one year through fish cage checked everyday in front of the structure, and 8 fishermen were selected to make logbook to study about fish productivity. 3
4 During one year of fish ladder monitoring (Sep-2006 to Aug-2007), 41,980 fish individuals for 850 kilograms migrated throw fish ladder. There were only 4 orders with 10 families and 55 fish species which migrated from downstream to upstream and only 5 orders with 11 family and 40 fish species from upstream to downstream throw spill way structure. Only 18 of 55 fish species was occurrence in fish ladder. Most fish species migrated were in Cypriniformes orders, especially in September and October Fish prefer migration at day to night time which Cipriniformes at day time and Siluriformes at night time. Fish species migrated to find new habitat than spawning. Fish migration had not relationship with rainfall factor, but it had relationship with water level in reservoir and in downstream, especially fish migration had relationship with lunar calendar (waxing moon). For fish catch estimation by fishermen logbook (6 fishermen in reservoir and 2 fishermen in downstream), there were 8 orders with 18 families and 69 fish species was recorded in Chinit reservoir and 44 fish species recorded in Chinit downstream. The total catch in the both sites were around 11 tons per year which the figure was higher than in But for the total catch was estimated 653 tons per year in Chinit reservoir that meant 0.9 kilograms/family/day and 74 tons per year in Chinit River that meant 0.6 kilograms/family/day. The abundant of fish was caught by gill net and seine net. After Chinit reservoir rehabilitation, fish stock in Chinit reservoir has increased from 141 tons to 151 tons. It meant that the fish stock high potential to support in local consumption, because just after dam construction, fish stock increased 10 tons, and moreover, fish ladder structure has attracted fish to migrate from downstream to reservoir, which fish around 40,000 with 750 kilograms a year. But high fish yield was caught by fishermen using Brush Park during December 2006 to April 2007, which this fishing gear is prohibited by fishery law. If this fishing gear is reduced or eliminated from Chinit downstream, the fish stock in Chinit reservoir will be high potential. 4
5 TABLE OF CONTENT ACKNOWLEDGEMENTS...2 ABSTRACT...3 TABLE OF CONTENT...5 CHAPTER I: INTRODUCTION 1.1 Background... Error! Bookmark not defined. 1.2 Rationale... Error! Bookmark not defined. 1.3 Research Question... Error! Bookmark not defined. 1.4 Hypothesis... Error! Bookmark not defined. 1.5 Objective... Error! Bookmark not defined. 1.6 Scope of Study... Error! Bookmark not defined. 1.7 Limitation of Study... Error! Bookmark not defined. CHAPTER II: LITERATURE REVIEW 2.1 Kompong Thom Background... Error! Bookmark not defined Geography... Error! Bookmark not defined Demography... Error! Bookmark not defined Stung Chinit Information... Error! Bookmark not defined Inland Fish Catch Yield Error! Bookmark not defined. 2.2 Project Area... Error! Bookmark not defined Stung Chinit Irrigation System Information... Error! Bookmark not defined Fish Migration Construction... Error! Bookmark not defined Water Level and Rainfall in the Chinit Reservoir AreaError! Bookmark not defined. CHAPTER III: METHODOLOGY 3.1 Time of Study... Error! Bookmark not defined. 3.2 Place of Study... Error! Bookmark not defined. 3.3 Tools of Research... Error! Bookmark not defined Fish Pass Monitoring... Error! Bookmark not defined Fish Productivity Monitoring... Error! Bookmark not defined. 3.4 Data Collection and Analysis... Error! Bookmark not defined. 3.5 Materials in the Research... Error! Bookmark not defined. CHAPTER IV: RESULT AND DISCUSSION 4.1 Fish Pass Monitoring... Error! Bookmark not defined Fish Diversity Fish Ladder, Spill Way, Chinit River, Tonle SapError! Bookmark not defined Fish Pass Monitoring by Month... Error! Bookmark not defined Fish Pass Monitoring by Day and Night... Error! Bookmark not defined Fish Pass Monitoring by Lunar Calendar... Error! Bookmark not defined Fish Pass Monitoring by Richness Index (Shannon-Wiever) and OccurrenceError! Bookmark no Length Class Structure and Length-Weight Ratio of Main Fish SpeciesError! Bookmark not def Fecundity of Main Fish Species... Error! Bookmark not defined GSI Evolution... Error! Bookmark not defined. 5
6 4.1.9 Fecundity... Error! Bookmark not defined. 4.2 Fishermen records on Fish Catch... Error! Bookmark not defined Fishermen Records... Error! Bookmark not defined. Survey, CPUE estimation and Catch estimation... Error! Bookmark not defined Brush Park (prohibited by fishery law)... Error! Bookmark not defined Productivity of Fish Catch... Error! Bookmark not defined. CHAPTER V: CONCLUSION AND RECOMMENDATION 5.1 Conclusion... Error! Bookmark not defined. 5.2 Recommendation... Error! Bookmark not defined Irrigation System Engineering... Error! Bookmark not defined Royal Government or Fisheries Administration... Error! Bookmark not defined. ANNEX Questionnaire... Error! Bookmark not defined.1 Result of TABLE Table 2.1: Chinit reservoir elevation, area, volume and mean deptherror! Bookmark not defined. Table 2.2: Number of days that water level is up to 252 in Chinit ReservoirError! Bookmark not defined. Table 3.1: Fishermen sampling for logbook making... Error! Bookmark not defined. Table 3.2: List of fishing gear... Error! Bookmark not defined. Table 3.3: List of people sampling for survey... Error! Bookmark not defined. Table 3.4: Fishing gear for each village estimation (example of 2 villages)error! Bookmark not defined. Table 3.5: Number of Brush Park in Chinit River... Error! Bookmark not defined. Table 4.1: Orders and families of fish recorded at fish ladder and spillwayerror! Bookmark not defined. Table 4.2: Orders and families of fish recorded at fish ladder and spillway, Chinit River and Tonle Sap... Error! Bookmark not defined. Table 4.3: Water level in Chinit Reservoir, Kg. Thmar Bridge, and rainfallerror! Bookmark not defined. Table 4.4: Relation between rainfall, Chinit reservoir level and Chinit river level at Kompong Thmar during the rainy season... Error! Bookmark not defined. 6
7 Table 4.5: Abbreviation list of fish species... Error! Bookmark not defined. Table 4.6: Fecundity in relation with total length... Error! Bookmark not defined. Table 4.7: Abbreviation fish name, Khmer name, scientific name, fish order, fish familyerror! Bookmark n Table 4.8: Catch by fish order and total catch in Chinit reservoir and Chinit RiverError! Bookmark not defi Table 4.9: Percentage of fishermen interviewed in each village... Error! Bookmark not defined. Table 4.10: CPUE for each fishing gear based on catch by fishermen selectederror! Bookmark not defined Table 4.11: Catch by each fishing gear in Chinit Reservoir... Error! Bookmark not defined. Table 4.12: Villages in Chinit down stream concerned by survey Error! Bookmark not defined. Table 4.13: Fishing gear used and CPUE... Error! Bookmark not defined. Table 4.14: Catch estimated... Error! Bookmark not defined. FIGURE Figure 2.1: Rainfall in 2006 and reference period ( )... Error! Bookmark not defined. Figure 2.2: Water level in Chinit Reservoir and rainfall (1st August to 31st December)Error! Bookmark not Figure 2.3: Flow discharge, station Kg Thmar Bridge, in Error! Bookmark not defined. Figure 2.4: Water temperature, station Chinit weir, in Error! Bookmark not defined. Figure 3.1: Kompong Thom Province Map... Error! Bookmark not defined. Figure 3.2: Location of research... Error! Bookmark not defined. Figure 4.1: Number of species for each order in different sites... Error! Bookmark not defined. Figure 4.2: Number for each order and by month registered at fish laddererror! Bookmark not defined. Figure 4.4: Weight for each order and by month registered at fish laddererror! Bookmark not defined. Figure 4.5: Abundance monthly analysis, Principal Component Analysis (PCA)Error! Bookmark not define Figure 4.6: Specie monthly analysis, Principal Component Analysis (PCA)Error! Bookmark not defined. Figure 4.7: Abundance Day and Night analysis, Principal Component Analysis (PCA)Error! Bookmark not Figure 4.8: Number of fish registered at day and night by different orderserror! Bookmark not defined. Figure 4.9: Abundance day and night analysis, Principal Component Analysis (PCA)Error! Bookmark not d Figure 4.10: Abundance lunar calendar analysis, Principal Component Analysis (PCA)Error! Bookmark no 7
8 Figure 4.11: Abundance analysis with Rainfall... Error! Bookmark not defined. Figure 4.12: Abundance analysis with Water Level in Reservoir (WLR)Error! Bookmark not defined. Figure 4.13: Abundance analysis with Water level in Downstream (WLDn)Error! Bookmark not defined. Figure 4.14: Occurrence day/night of fish species at fish ladder (Sep 2006 Aug 2007)Error! Bookmark not Figure 4.15: Length Frequencies (Mystus nemurus -Trey Chhlang)Error! Bookmark not defined. Figure 4.16: Length and weight relationship of fish (Mystus nemurus - Trey Chhlang)Error! Bookmark not Figure 4.17: Length Frequencies (Micronema micronema - Trey Kes)Error! Bookmark not defined. Figure 4.18: Length and weight relationship of fish (Micronema micronema - Trey Kes)Error! Bookmark n Figure 4.19: Length Frequencies (Pangasius hypophthalmus - Trey Pra)Error! Bookmark not defined. Figure 4.20: Length and weight relationship of fish (Pangasius Hypophthalmus - Trey Pra)Error! Bookmark Figure 4.21: Length Frequencies (Thynnichthys thynnoides - Trey Linh)Error! Bookmark not defined. Figure 4.22: Length and weight relationship of fish (Thynnichthys thynnoides - Trey Linh)Error! Bookmark Figure 4.23: Length Frequencies (Dangila spp - Trey Khnang Veng)Error! Bookmark not defined. Figure 4.24: Length and weight relationship of fish (Dangila spp - Trey Khnang Veng)Error! Bookmark no Figure 4.25: Length Frequencies (Osteochilus melanopleurus - Trey Krum)Error! Bookmark not defined. Figure 4.26: Length and weight relationship of fish (Osteochilus melanopleurus- Trey Krum)Error! Bookma Figure 4.27: Length Frequencies (Barbodes altus -Trey Kahe)... Error! Bookmark not defined. Figure 4.28: Length and weight relationship of fish (Barbodes altus - Trey KaheError! Bookmark not defin Figure 4.29: Length Frequencies (Puntioplites protozysron - Trey Chrakaing)Error! Bookmark not defined Figure 4.30: Length and weight relationship of fish (Puntioplites proctozysron-trey Chrakaing)... Error! Bookmark not defined. Figure 4.31: Length Frequencies (Henichorhynchus siamensis - Trey Riel)Error! Bookmark not defined. Figure 4.32: Length and weight relationship of fish (Henichorhynchus siamensis - Trey Riel)Error! Bookma Figure 4.33: Length Frequencies (Botia modesta - Trey Kanchrouk Krohorm)Error! Bookmark not defined Figure 4.34: Length and weight relationship of fish (Botia modesta-trey Kanchrouk krahorm)error! Bookm Figure 4.35: GSI evolution/total length for Henicohynchus siamensiserror! Bookmark not defined. 8
9 Figure 4.36: GSI evolution/total length for Thynnichthys thynnoideserror! Bookmark not defined. Figure 4.37: GSI evolution/total length for Rasbora aurontaenia Error! Bookmark not defined. Figure 4.38: GSI evolution/total length for Botia spp... Error! Bookmark not defined. Figure 4.39: GSI evolution/total length for Mystus nemurus... Error! Bookmark not defined. Figure 4.40: Catch occurrence in Chinit reservoir... Error! Bookmark not defined. Figure 4.41: Catch occurrence in Chinit River... Error! Bookmark not defined. Figure 4.43: Fish catch by month in Chinit River... Error! Bookmark not defined. Figure 4.44 and 4.45: percentage of each fish order catched in Chinit reservoirerror! Bookmark not defined Figure 4.46 and 4.47: percentage of each fish order catched in Chinit DownstreamError! Bookmark not def Figure 4.48: Specie Richness analyzed by PCA for reservoir and Chinit River (down stream)error! Bookma Figure 4.49: Fishing gear analyzed by PCA for reservoir and Chinit River (down stream)error! Bookmark n 9
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