reproduction of an isolated iranian cichlid, iranocichla hormuzensis

نویسندگان
چکیده

the reproductive biology of the iranian cichlid, iranocichla hormuzensis coad, 1988, was investigated for 13 consecutive months in lower mehran river, from august 2008 through august 2009. four hundred and eighty six individuals (252 males and 234 females) were captured using a seine net (5 mm mesh size). the observed sex ratio was 1m: 0.93f (χ², df = 1, p = 0.414). mean ± sd of total length (tl) values in males and females were 70.34 ± 8.16 and 62.08 ± 6.51 mm, respectively. the frequency of 56-65 mm size class was higher in females and the 66-75 mm size class in males. a gonadosomatic index (gsi) analyses of females indicated that the reproductive period was during february-june, with a peak in march. fecundity was best correlated with total body mass (m) (linear regression, r2 = 0.62) condition factor (linear regression, r2 = 0.62) and total length (tl) (linear regression, r2 = 0.56). the absolute fecundity ranged between 48-167 eggs with a mean ± sd of 107 ± 35.2. egg diameters ranged from 0.58 to 2.93 mm.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Reproduction of an isolated Iranian cichlid, Iranocichla hormuzensis

The reproductive biology of the Iranian cichlid, Iranocichla hormuzensis Coad, 1988, was investigated for 13 consecutive months in lower Mehran River, from August 2008 through August 2009. Four hundred and eighty six individuals (252 males and 234 females) were captured using a seine net (5 mm mesh size). The observed sex ratio was 1M: 0.93F (χ², df = 1, P = 0.414). Mean ± SD of total length (T...

متن کامل

Morphological characteristics of Parsi cichlid Iranocichla persa (Teleostei; Cichlidae)

To provide more morphological data of I. persa, in this study, morphological characteristics along with scales and otolith were studied. Fish samples were collected from Khorgo spring and transferred to the laboratory. Fish were classified into three class sizes based on standard length. Based on the results, the size of the first class was different in 12 relative traits but did not show a sig...

متن کامل

an examination of developmental dyslexia among iranian efl second graders

چکیده رساله/پایان نامه: این تحقیق جهت بررسی تاثیر نارسا خوانی در یادگیری زبان انگلیسی به عنوان زبان خارجه در میان دانش اموزان ایرانی مقطع دوم راهنمایی طراحی شده است. ده نفر از دانش اموزان ایرانی مقطع دوم راهنمایی و ده نفر از دانش اموزان غیر نارسا خوان همان مقطع برای انجام این تحقیق انتخاب شدند. تمام شرکت کنندگان توسط ازمون زبان انگلیسی ای که برای این هدف ساخته شده و متشکل از بخشهای خواندن ام...

15 صفحه اول

Iranocichla persa, a new cichlid species from southern Iran (Teleostei, Cichlidae)

Iranocichla persasp. n. is described from the Shur, Hasanlangi and Minab River drainages flowing into the Persian Gulf at the Strait of Hormuz in southern Iran. It is distinguished from Iranocichla hormuzensis, from the Mehran River drainage, by nuptial males having a bright orange breast and lower part of the head (vs. black), a poorly developed or invisible (vs. distinctive) "Tilapia-mark" in...

متن کامل

بررسی رژیم غذایی ماهی سیچلاید ایرانی Iranocichla hormuzensis در رودخانه کُل استان هرمزگان

 این مطالعه به­منظور بررسی رژیم غذایی ماهی سیچلاید ایرانی (Iranocichla hormuzensis) در رودخانه کل استان هرمزگان به­مدت 12 ماه از بهمن ماه 1393 تا دی ماه 1394 انجام شده است . نمونه­برداری با تورهای پرتابی (سالیک) و تور انتظاری انجام شد. جهت بررس...

متن کامل

Social regulation of reproduction in male cichlid fishes.

Social interactions and relative positions within a dominance hierarchy have helped shape the evolution of reproduction in many animals. Since reproduction is crucial in all animals, and rank typically regulates access to reproductive opportunities, understanding the mechanisms that regulate socially-induced reproductive processes is extremely important. How does position in a dominance hierarc...

متن کامل

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید


عنوان ژورنال:
caspian journal of enviromental sciences

جلد ۱۳، شماره ۲، صفحات ۱۱۹-۱۲۸

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023