7089

6631

كارشناسي ارشد

تكثير و پرورش آبزيان

اصفهان: دانشگاه صنعتي اصفهان، دانشكده منابع طبيعي

1390

دوازده، 80ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

نصراله محبوبي صوفياني، سالار درافشان

عيسي ابراهيمي

25/7/91

يزدان كيواني، فاطمه پيكان حيرتي

1396/09/20

كتابنامه

منابع طبيعي

مهندسي منابع طبيعي

ID6631

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Effect of Tribulus terrestris and 17 Methyltestosterone on Growth Performance and Masculinization of Rainbow Trout Oncorhynchus mykiss Noushin Ghamati Noushin Ghamati 63@yahoo com Date of Submission 2012 03 5 Department of Natural Resources Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisors Nasrollah Mahboobi Soofiani Soofiani@cc iut ac ir Salar Dorafshan sdorafshan @cc iut ac irAbstractThe action of phytochemicals when administered to fish for sex reversal and as a growth boosteris a recent subject of study The present research is focused on the use of Tribulus terrestris TT extract Zygophylaseae and 17 methyltestosterone MT to investigate theirs potential actionon growth performance body composition and masculinization of rainbow trout Oncorhynchusmykiss In a completely randomized design experimental diets supplimented with 2 5 5 10 and20 g kg food TT and two diets containing 3 and 6 mg kg food MT along with a control diet free of TT and MT were evaluated The seven treatments each consisted of three replicate Theexperiment was conducted on the first feeding genetically all female rainbow trout with the meanweight of 0 11 0 02 g A stock of American imported fish were assigned to experimental dietsfor 3 different trials of 60 90 and 120 days At the end of each experiment fish performance wasassesed in terms of mean final weight specific growth rate SGR condition factor CF foodconversion ratio FCR weight gain percentage WGP and body composition Histologicalexaminations was carried out to determine the developmental stage of testes and ovary Theresults indicate that MT6 treated fish exhibited successful growth acceleration compared to thecontrol TT2 5 treatment also improved the growth rate of fish At the termination of theexperiment all treatments except TT10 and TT20 showed a better specific growth rate SGR compare to control Food conversion ratio FCR of MT and TT treated fish were significantlygreater than that of control at the end of 60 days of experiment p 0 05 Codition factor CF wasnot significantly different from Control group in all 3 Trials p 0 05 It was concluded that usageof higher doses and treatment duration of TT extract had negative effects on growth performance In addition It could be concluded that the MT and TT treatments had no negative effects on bodycomposition Nevertheless the highest and the lowest percentage crude lipid were observed inMT3 8 32 and TT20 7 44 treatments respectively Mean percentage moisture and ash were77 29 1 08 and 1 69 0 18 respectively On the other hand the highest and the lowest percentagecrude protein were observed in MT3 14 73 and control 14 19 Histological studies of sampledfish at the end of 90 and 120 days of treatments did not show a clear gonadal structure diagnosis so fish sex was undetectable Therefore gonad examination 14 months after hatch was carriedout again only for our first trial 60 days Macroscopic and microscopic investigations revealedthat TT treatments in considered dosages had no effects on masculination of rainbow trout Nevertheless MT treatments 3 and 6 mg kg food resulted in 88 88 and 71 42 percent malepopulation respectively Gonads from control TT and MT treatment were in an early stage andcompletely normal Furthermore among the fish subjected to MT3 one of the treated individualswere found to develop intersex gonads Key words Rainbow trout Oncorhynchus mykiss Tribulus terrestris 17 methyltestosterone Growth performance Masculinization

نصراله محبوبي صوفياني، سالار درافشان

عيسي ابراهيمي

يزدان كيواني، فاطمه پيكان حيرتي