Title of article :
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
Author/Authors :
Bandpei, Afraei Ecological Research Institute of Caspian Sea - P.O. Box - 961, Sari , Mashhor, M.A.M School of Biological Sciences - Universiti Sains Malaysia - 11800 - Penang, Malaysia , Abdolmaleki, S.H Inland Water Aquaculture Research Institute - P.O.Box - 66, Bandar Anzali , Najafpour, S.H Ecological Research Institute of Caspian Sea - P.O. Box - 961, Sari , Bani, A Department of Fisheries - Faculty of Natural Resources - University of Guilan - P.O. Box - 1144, Sowme-Sara , Pourgholam, R Ecological Research Institute of Caspian Sea - P.O. Box - 961, Sari , Fazli, H Ecological Research Institute of Caspian Sea - P.O. Box - 961, Sari , Nasrolahzadeh, H Ecological Research Institute of Caspian Sea - P.O. Box - 961, Sari , Janbaz, A.A Ecological Research Institute of Caspian Sea - P.O. Box - 961, Sari
Abstract :
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. kutum
were occurred during March-April, with the highest average value of 6.52 for males and of 17.00 for females in April. 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 0 1
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.
Keywords :
Length at maturity , Fecundity , GSI , Rutilus frisii kutum , Caspian Sea
