To study anomaly among body components in the Mahisefid population situated in one of the spawning rivers, the abnormal fishes were sampled (n=10). Twenty six morphological properties were measured to be statistically (P<0.05) compared with normally caught fishes. The mentioned characters were standardized based on the total length. Eight ratios including standard length (SL), snout length (SNL), dorsal fin height (DFH), distance between pelvic fin to ventral fin (PV), distance between snout to anterior part of dorsal fin (PRB), distance between posterior part of dorsal fin to anterior part of caudal fin (POB), upper part of caudal fin length (UCFL) and mid part of caudal fin Length (CCFL) of abnormal fishes differed significantly (P<0.05) from those of healthy fishes. The morphological characters were classified at three components. Discriminant analysis showed the ratios of fork length and standard length were the significantly (P<0.05) variables to screen samples. Draining diverse pollutants and heavy metals to the receiving rivers, inbreeding and technical errors during propagation were the most important reasons threating the life cycle of Mahisefid populations.
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Abdolhay, H.A. and Tahori, H.B. 2006. Fingerling production and release for stock enhancement of sturgeon in the Southern Caspian Sea: An overview. Journal of Applied Ichthyology, 22(1):125-131.
Abdolhay, H.A., Khalijah, D.S., Pourkazemi, M., Shapor, S.S., Rezvani, S., Satar, M.K.A. and Hosseinzadeh Sahafi, H. 2010. Morphological studies of Mahisefid (Rutilus frisii kutum, Kamensky, 1901) from selected rivers in the southern Caspian Sea. Iranian Journal of Fisheries Sciences, 9 (1): 1-18.
Bengtson, B.E., Bengtson, A. and Hinberg, M. 1985. Fish deformities and pollution in some Swedish waters. Ambio1ogy, 4: 32–5.
Brown, C.L. Nunez, J. M. 1998. Disorders of development. In: J. F. Leatherland, P. T. K. Woo (Ed.), Fish Diseases and Disorders, 2nd edition.Oxon CABI publishing.
Dulin, M. 1979 . Fish Diseases. TFH Publication Inc, 93 p.
Harris, K. C., Hulsman, P. F. 1991. Intensive culture of lake whitefish (Coregonus clupeaformis) from larvae toyearling size using dry feeds. Aquaqulture, 96: 255- 268.
Haya, K. 1989. Toxicity of pyrethroid insecticides to fish. Environment Toxicology Chemistry, 8: 381-391.
Kashefi, P., Bani, A. and Ebrahimi, E. 2012. Morphometric and meristic variations between non- reproductive and reproductive Kutum femals (Rutilus frisii kutum, Kamensky, 1901), in the southwest Caspian Sea,. Italian Journal of Zoology, DOI:10.1080/11250003.2011.642414.
Kiabi, B. H., Abdoli, A. Naderi, M. 1999. Status of the fish fauna in the South Caspian Basin of Iran. Zoology in the Middle East, 18:57-65.
Lien, N. T. H. 1997. Morphological abnormalities in African catfish Clarius gariepinus larvae exposed to Malathion. Chemosphere. 1475–86.
Polo, A., Yafera, M., Pascual, E. 1991. Effects of temperature on egg and larval development of Spartus aurata L. Aquaculture, 92: 367-375.
Sadler, T.W. 1990. Langman’s Medical Embryology. 6th edn. Baltimore: Williams & Wilkins. 411 pp.
Snelder, T. 1995. The environmental impacts of urban stormwater runoffs. Auckland Regional Council Technical Publication, 53: 1–96.
Valipour, A., Khanipour, A. A. 2009. Mahisefid, Jewel of Caspian Sea. Publication of Iranian Fishery Reseach Organisation. Tehran. Iran. 185 pp.
Weis, J. S., Weis, P. 1989. Effects of environmental pollutants on early fish development. Aquatic Science, 1: 45-73.
Wilson, T. 1999.Catchment 22. Metro, 214:53-59.
Zar, J. H. 1999. Biostatistical Analysis. New Jersy, USA. Prentice-Hall, Inc.