The Environmental Effect on Spawning Time, Length at Maturity and Fecundity of Kutum (Rutilus frisii kutum, Kamensky, 1901) in Southern Part of Caspian Sea, Iran

سال انتشار: 1390
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 853

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شناسه ملی سند علمی:

JR_IJEE-2-4_011

تاریخ نمایه سازی: 1 اردیبهشت 1393

چکیده مقاله:

Fish sampling were carried out using beach seines during the fishing season from early October 2006 to mid April 2007. The gonadosomatic indexes (GSI) in range and average for female and male were 0.03 to 40.28(5.70 ± 6.48) and 0.13 to 16.71 (3.39 ± 2.33), respectively. The GSI indicated that the reproductions of R. f. kutumwere occurred during March-April, with the highest average value of 6.52 for males and of 17.00 for females inApril. Fifty percent of length maturity (L ) at FL = 37.78 cm was recorded. The absolute fecundity ranged from m50% 15,723 for a three-year old to 130,737 eggs for an eight-year old female, with a mean of 60435 ± 24889. The relationship between fecundity (F) and fork length (cm) was represented by the formula: Fec. = 6616FL+25916.The von Bertalanffy growth parameters was: L =67.5cm, K=0.21 yearG , t =-0.10 for throw population of kutum. 8 01 The maximum spawning migration into the rivers based on GSI occurred significantly in April but it be affected by environment of sea water layers. The results showed that the length at first maturity and fecundity of R. f. kutum reduced in southern part of Caspian Sea.

کلیدواژه ها:

Length at maturity % Fecundity % GSI % Rutilus frisii kutum % Caspian Sea

نویسندگان

Afraei Bandpei

Ecological Research Institute of Caspian Sea, P.O. Box, ۹۶۱, Sari, Iran Corresponding Author

m.a.m Mashhor

School of Biological Sciences, Universiti Sains Malaysia, ۱۱۸۰۰, Penang, Malaysia

s.h Abdolmaleki

Inland Water Aquaculture Research Institute, P.O.Box, ۶۶, Bandar Anzali, Iran

s.h Najafpour

Ecological Research Institute of Caspian Sea, P.O. Box, ۹۶۱, Sari, Iran