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Iranian Journal of Ichthyology، جلد ۲، شماره ۱، صفحات ۱۳-۱۹
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عنوان انگلیسی Some biological characteristics of Sefidrud loach, Oxynoemacheilus bergianus (Teleostei: Nemacheilidae), in Aras River, northwestern Caspian Sea basin
چکیده انگلیسی مقاله Some 190 specimens of Sefidrud loach, Oxynoemacheilus bergianus , were collected from Aras River (Northwestern Iran) and age, size, and some biological characteristics of the samples were investigated from March to July 2013. The maximum age was 3 + years. The specimens ranged in size from 42 to 64mm for males and 45 to 61mm for females in total length, weighing from 0.62 to 2.03g for males and 0.63 to 1.66g for females. Length-weight relationship was estimated as W= 0.00005TL 2.81 for females, W= 0.000005TL 3.11 for males and W= 0.000008TL 2.97 for the sexes combined. Sex ratio was 1M:0.9F, in favor of males (P< 0.05). The growth model was isometric for males, females and sexes combined. The calculated maximum Fulton’s condition factor ( K F ) and allometric condition factor ( K A ) were 0.900 and 0.010 in males and 1.000 and 0.009 in females, respectively. The most frequent age classes in the samples were 2 + years for both males and females. In general, as most other loaches, Sefidrud loach is also a small short lived species with a low frequency in Aras River.
کلیدواژه‌های انگلیسی مقاله Loaches, Growth, Condition factor, Sex ratio, Iran.
نویسندگان مقاله هادی جمالی | hadi jamali
department of fisheries, faculty of natural resources, urmia university, p.o.box 46414-356, urmia, iran.

سازمان اصلی تایید شده: دانشگاه ارومیه (Urmia university)

احمد حسن پور فتاحی | ahmad hasanpour fattahi
department of fisheries, gonbad kavous university, gonbad kavous, iran.


داریوش عبداللهی | daruosh abdollahi
department of fisheries, gonbad kavous university, gonbad kavous, iran.


رحمان پاتیمار | rahman patimar
department of fisheries, faculty of natural resources, gonbad kavous university, golestan, iran.


یزدان کیوانی | yazdan keivany
department of fisheries, faculty of natural resources, isfahan university of technology, isfahan 84156-838111, iran.

سازمان اصلی تایید شده: دانشگاه صنعتی اصفهان (Isfahan university of technology)

نشانی اینترنتی http://ijichthyol.org/index.php/iji/article/view/8
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زبان مقاله منتشر شده en
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