6669

6220

كارشناسي ارشد

بوم شناسي آبزيان شيلاتي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده منابع طبيعي

1390

چهارده، 89ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

يزدان كيواني، نصرالله محبوبي صوفياني

خسروآئين جمشيد

13/2/91

سالار درافشان، فاطمه پيكان حيرتي

1396/10/06

كتابنامه

منابع طبيعي

مهندسي منابع طبيعي

ID6220

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Reproductive Biology of Kingsoldier Bream Argyrops spinifer in Coastal Waters of Bushehr Province Persian Gulf Samira Hamzeh s hamzeh@in iut ac ir Date of Submission 2012 02 21 Department of Natural Resources Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Yazdan Keivany keivany@cc iut ac irNasrollah Mahboubi Soofiani soofiani@cc iut ac irAbstractThe reproductive characteristics such as reproductive cycle gonad maturation gonado somatic indices GSI and fecundity of 639 kingsoldier bream Argyrops spinifer a commercial species of Sparidae family in thePersian Gulf were investigated by monthly sampling during June 2010 to May 2011 Samples were caught bylocal fisherman using trawl net in waters of Bushehr province in the northern part of the Persian Gulf Eachmonth a total of 50 to 60 specimens of fish were examined on average Total length of fish sampledranged from 15 to 61 2 cm in males and 13 5 to 64 2 cm in females and total weight ranged 77 3450 g and52 5 4162 g in males and females respectively Size Lm50 and age Am50 at first maturity were estimatedto be 30 1 cm total length and 5 years for males and 31 3 cm total length and 6 years for females this indicatethat A spinifer is exploited below the mean size at sexual maturity Age determination using annualgrowth rings on sagittal otoliths was estimated Age groups of females and males were in the range of 2 to 21 and 2 to 25 respectively The overall sex ratio was 0 8 1 male female and were significantlydifferent from the expected ratio of 1 1 p 0 05 2 test The most frequent age groups were 2 and 3 inmales and females respectively The highest value of condition factor was observed in January for femalesand in February for males The minimum maximum and average absolute fecundity were 79061 2374796and 682940 527998 respectively for females 17 47 cm total length and weighing 117 5 1666 gr Therelationship between absolute fecundity and fish total length was represented by the following linearequation F 54417 L 92699 r 0 767 and a linear equation F 1165 W 41595 r 0 806 was foundbetween absolute fecundity and fish weight The analysis of ova diameter for the species revealed that thereare 3 egg batches in ripe ovary of A spinifer and swing diameter of eggs in the ovaries of these fishthroughout the year was between 25 to 800 microns Regarding gonado somatic index GSI values oocyte diameter histological studies and abundance of different stages of maturity at different month itseems that spawning of A spinifer occurs from December to April Indeed gonad maturation started fromDecember and spawning completed in March and April Long spawning season suggests that A spinifer is amultiple spawner with an asynchronous ovary This finding could be confirmed by oocyte diameter andhistological studies too No changes in gonad conditions were noted from May to October The results of thepresent study presume state of both protogyny and rudimentary hermaphroditism in A spinifer The results ofthis study provide fundamental information on the reproduction biology of A spinifer in the Northern PersianGulf that can be used in management models for the continued sustainable exploitation of this species in theIranian demersal coastal fisheries Keywords Kingsoldier bream Argyrops spinifer Sparidae Persian Gulf Reproductive characteristics

يزدان كيواني، نصرالله محبوبي صوفياني

خسروآئين جمشيد

سالار درافشان، فاطمه پيكان حيرتي