5791

5406

كارشناسي ارشد

تكپير و پروش آبزيان

اصفهان: دانشگاه صنعتي اصفهان، دانشكده منابع طبيعي

1389

چهارده،77ص.: مصور﴿رنگي﴾،جدول،نمودار

ص.ع.به فارسي و انگليسي

اميدوار فرهاديان، نصراله محبوبي صوفياني

مهدي محمدي

3/2/90

عيسي ابراهيمي، يزدان كيواني

مهندسي منابع طبيعي

ID5406

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Community Composition of Zooplankton and Macrobenthos in Litopenaeus vannamei Rearing Ponds and their Importance in Daily Food Intake Narjes Bakhtiari n bakhtiari@na iut ac ir November 2010 Department of Natural Resources Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor O Farhadian Assist Prof omfarhad@cc iut ac ir Supervisor N M Soofiani Assoc Prof soofiani@cc iut ac ir Abstract The purpose of this study was to analyze the composition and abundance dominant plankton and macrobenthos organisms in Litopenaeus vannamei rearing ponds Delvar Busher Iran and their importance in daily food intake during 113 day period Samplings were conducted after stocking the ponds with postlarvae PL12 every 15 days starting from July 2009 Samplings were carried out for phytoplankton by water collection for zooplankton by zooplankton net 55 m mesh size and macrobenthos by grab 25 25 cm dimension During culture period the water and shrimp post larvae larvae were sampled Results showed that ponds water had 45 50 g L of salinity 3 5 5 5 mg L of dissolved oxygen 8 1 8 4 of pH and 24 32 C of water temperature The phytoplankton community were Bacillariophyceae Dinoflagellates Cyanobacteria and Chlorophytes with Navicula Coscinodiscus and Nitzschia being dominant The main groups of zooplankton during each sampling period consisted of rotifer copepod and meroplanktonic organisms The copepod assemblage belonged to Calanoidae Cyclopoidae and Harpacticoidae with mean abundance were estimated to be 3 17 0 2 5 0 and 0 1 individuals L respectively The major copepod species were Acartia Centropage and Oithona during L vannamei rearing period On the other hand the rotifer Brachionus plicatilis was dominant at the beginning of culture and its abundance varied between 0 to 122 ind L The meroplankton community during culturing period were consisted of Trochophore Scyphomedusae and Phyllosoma larvae Macrobenthos polychaeta and chironomid were dominant among macrobenthic community with relative abundance of 16 7 and 83 3 respectively and total absolute abundance of 0 352 ind m2 Correlation analyses showed were no significant correlation P 0 05 between pH and dissolved oxygen and zooplankton abundance while there correlative P 0 05 between water quality parameter and macrobenthos abundance Results stated that specific growth rate of L vannamei in rearing ponds varied during culturing period and its mean was 3 03 mg day and 0 93 mm day The gut contents of L vannamei were mainly included artificial shrimp food phytoplankton zooplankton and macrobenthos which indicated this species consumed different food sources either in pond or in artificial form Further study on gut analyses were conducted using gut fullness and color index The highest gut fullness was obsorved in foregut 0 95 and the lowest in hindgut 0 20 while colore index were dominant with brown green color throughout the gut Key words Litopenaeus vannamei Zooplankton Macrobenthos Phytoplankton Specific Growth Rate Gut Contents Gut Fullness Color index

اميدوار فرهاديان، نصراله محبوبي صوفياني

مهدي محمدي

عيسي ابراهيمي، يزدان كيواني