A Study on Populations of Endangered Species, Shemaya, Chalcalburnus<br /> Chalcoides in The Haraz and Shirud Rivers.<br />
Journal Title: محيط شناسي - Year 2008, Vol 34, Issue 46
Abstract
In this study, age and growth for two populations of Shemaya, Chalcalburnus chalcoides, in Haraz and Shirud rivers were investigated in April to June 2006. 704 fish specimens were collected using a Cast- net. The maximum length and weight observed were 251 mm and 96 gr, in a 5- year old female. The most abundant age groups were 2+ and 3+ years for male and female respectively. While male of Shirud populations were heavier and longer on average in younger ages (ANCOVA, P ≤ 0.05), differences in female were not significant (ANCOVA, p≥ 0.05). Female of Haraz population had isometric growth while positive allometry was observed in the fish population of Shirud. The Von Bertalanffy growth parameters were: (Haraz population: for male and for female), (Shirud population: for male and for female). In the two populations, Female had higher L∞, while Kvalue for males were relatively higher in the two rivers.
Authors and Affiliations
Hossein Rahmani
Keywords
Related Articles
- EP ID EP84569
- DOI -
- Views 144
- Downloads 0
Investigation of Heavy Metals Accumulation in soil, leave and fruit of Olive (Olea europaea L.) Irrigated with Municipal Effluent
The most factors for making unbalance in irrigation of soil with municipal effluent is the presence of heavy metals in municipal effluent and transformation of this pollution in food chain and threaten of healthy. The ai...
الگويي براي تحديد محدودة مطالعاتي در ارزيابي پيامد فعاليت‌ها بر محيط زيست (با استفاده از :شش مطالعة موردي)
خروجي‌هاي گزارش ارزيابي پيامد فعاليت‌ها بر محيط زيست (ا.پ.ف.م.) به منزلة يک سامانة پشتوانه تصميم‌گيري همواره تابعي از مرزهاي محدودة مطالعاتي خواهد بود. اين در حالي است که مرز محدوده مطالعاتي ممکن است در بر گيرندة دو ماهي...
Daily Air Pollution Time Series Analysis of Petrochemical Industry of Isfahan
Air pollution is the result of human activities in twentieth century which has direct and indirect effects on human being and its environment. Environmental researchers and human ecologists have studied air pollution qua...
بررسي شدت آلودگي عناصر سنگين در رسوبات <br /> رودخانه شفارود<br />
در اين تحقيق رسوبات رودخانه شفارود جهت تعيين غلظت عناصر سنگين، منشأ عناصر و شدت آلودگي مورد آناليز شيميايي قرار گرفتند. گرچه از سال های 1350 مقايسه نتايج غلظت عناصر سنگين با استانداردهای جهاني رايج بوده است ليکن نتايج تح...
بررسي اقتصادي – زيست محيطي حذف(اس-او-2/ اس-او-3)از واحد اسيد سولفوريک در صنعت پتروشيمي
در اين تحقيق به منظور كنترل اکسيدهاي گوگرد از دودکش‌هاي واحد اسيد سولفوريک، فرايند گوگرد‌زدايي به‌وسيلة اسکرابر آمونياک به عنوان روش پيشنهادي اول (Plant A) و همچنين ترکيب اسکرابر خشک با ماده جاذب هيدروکسيد کلسيم به عنوان...