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1、CLIMATE CHANGE AND ITS IMPACT ON FISHERIES RESOURCES IN BANGLADESH International Conference on Environmental Aspects of Bangladesh (ICEAB) Sept. 4, 2010. Japan. Presenter Muhammad Tanvir Hossain Chowdhury PhD Student, Department of Biotechnology Pukyong National University, Busan, KoreaMTH Chowdhury
2、, ZP Sukhan1, MA Hannan Department of Biotechnology, Pukyong National University, South Korea 1Laboratory of Marine Biology, Kyushu University, JapanINTRODUCTIONTemperature Rainfall HydrologyDirectly affectFreshwater FisheriesMarine FisheriesFish ProductionFish ProductionOn the basis of vulnerabilit
3、y Source: Macfadyen, G., and Allison, E. (2009). P 38.On the basis of adaptive capacitySource: Macfadyen, G., and Allison, E. (2009). P 38.INTRODUCTION most vulnerable countries in Asia depending on the vulnerability of national economy to the impacts of climate change on fisheries VULNERABILITY* Pr
4、edicted warming * Relative importance of fisheries to national economics and diet* Limited societal capacity to potential impacts and opportunitiesCombinedCombined Effect ofEffect ofhas lowest adaptive capacity to climate change in fisheries Climate change directly affect fishery production Fish rep
5、roduction, growth and migration patterns are all affected by temperature, rainfall and hydrology Climate change is likely to adversely affect both the fresh water and marine fisheries in Bangladesh.INTRODUCTION12 M+2nd; 4.83%Foreign Exchange4.48 %GDPContribution of Fisheries Sector in BangladeshPROT
6、EIN SUPPLY58.0 %20.87 %AGRICULTUR ECAUSES OF CLIMATE CHANGE Green house gases like carbon dioxide, methane and nitrous oxide have increased). The global increase of carbon dioxide is due to the use of land and fossil fuel, Increase of methane and nitrous oxide are due to agriculture Rising concentra
7、tion of the green house gases in the atmosphere are causing global climate changeEFFECT ON FRESHWATER FISHES IN BANGLADESHPoikilothermic animal Growth, reproduction & activity are directly influenced by the change of temperatureTEMPERATURESALINITYSolubility ofINVERSELY RELATED TO&TEMPERATUREDISSOLVE
8、D has harmful effect in pond fish culture&EFFECT ON FRESHWATER FISHES IN BANGLADESHTEMPERATUREACTIVITYEVAPOTRANS -PIRATIONSURFACE & VOLUME OF POND WATEREFFECT ON OPEN WATER FISHERIES RESOURCESContribute nearly 1 million metric ton of fishInundated during the flood stagesIsolated from the main channe
9、l during the dry seasonRegular flooding ensures the reproductive success of the fish EFFECT ON OPEN WATER FISHERIES RESOURCESGCM estimates of temperature and precipitation changes in BangladeshThis model was run by the IPCC (Inter-government Panel on Climate Change) B2 scenarioEFFECT ON OPEN WATER F
10、ISHERIES RESOURCESEVAPOTRANSPIRATIONVOLUME & FAVORABLE FISH HABITATSKILL1CHALLENGEThe Survival of Next Years Brood For Reproduction2EFFECT ON OPEN WATER FISHERIES RESOURCESRunoff with Higher NutrientFloodplain & Productivity+Extend the Feeding Ground of FishEFFECT ON OPEN WATER FISHERIES RESOURCESRu
11、noffFloodDestroy aquaculture InfrastructureRanching In Monson brings Revolution in Fish Productionreduced the closed water aquaculture productionEFFECT ON OPEN WATER FISHERIES RESOURCESDecrease productivityTEMPERATUREAquatic MacrophyteReduce fish habitatReduce dissolved OxygenCreate anoxic condition
12、 Fish KILLBangladesh might face this problem2-3OC of temperature cause 300-500% of macrophyte production123EFFECT ON COASTAL AREASea Level riseThe main impacts of climate change on coastal area in Bangladesh are 1Reduction of freshwater availability by salinity intrusion 2Increasing cyclone frequenc
13、y3Decrease Brackish water fish production4EFFECT ON COASTAL AREA1Water salinity varies from 0-20 ppt 2Water salinity and its distribution are increasing with the increase of sea level rise3Soil salinity in South Western part of Bangladesh is also increasing EFFECT ON COASTAL AREAIncreasing rate of s
14、oil salinity area of southern part of BangladeshArea (hectare)EFFECT ON COASTAL AREACycloneSidr (15 Nov., 2007) and Aila (27 May, 2009) hit South and South West part of Bangladesh and destroy the coastal embankment infrastructure and increase the salinityThis salinity intrusion including sea level r
15、ising creates harmful effect on existing fish species. Water salinity exceeds the expected salinity level that especially required for fresh water fish productionEFFECT ON COASTAL AREASALINITY INTRUSION Negative EffectPositive Effectthreatened to fresh water fisheries Loss of fish biodiversityCreate
16、 opportunities for catching and cultivating brackish and marine species Potential species Penaeus vannamei (Western White Shrimp) Penaeus monodon (Tiger Shrimp) Chanos chanos (Milk Fish)Mugil cephalus (Mullet)Tilapia nilotica (Tilapia)EFFECT ON SUNDARBAN FISHERIESEFFECT ON SUNDARBAN FISHERIESWorlds Largest single chunk of continuous mangrove forestFish species inhibit : 175
