Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2006.445.447Oncorhynchus mykiss, Walbaum 1792) and Rat (Rattus norvegicus, Berkenhout1769) in Morphometric and Histologic Manner]]>KocNazan Deniz3200693In this research, the Rainbow Trout (Oncorhynchus mykiss, Walbaum 1792) and Wistar Albino Rat (Rattus norvegicus, Berkenhout1769) are chosen vertebrates living in different media. It is seen that fish and rat kidneys differ in morphologic and histologic structures. Fish kidney consists of two different parts as head and body, whereas rat kidney has a more complicated and developed structure. After the examination of the sections taken from the kidney tissues, it is realized that the fish cortex and medulla shows difference with that of mammals in structure. Also, fish do not have a stable nefron system as in mammals and have different nefron structures in terms of structure and function. From the data obtained, it is observed that the fish kidney lacks the Henle part-which is a characteristic of developed vertebrates-it has more concentrated hematophoitic tissues and it has a different nefron structure.]]>Balinsky, B.I. and B.C. Fabian,19811981Bozkirli, I.,1999pp: 143-144pp: 143-144Demirsoy, A.,1993pp: 308-312pp: 308-312Drummond, I.A.,200014428435Hendriks, J.D.,1998pp: 97-99pp: 97-99Hofer, R.,1980Leitriz, E. and R.C. Lewis,1980pp: 73-75pp: 73-75Mcewen, R.S.,1949pp: 262-278pp: 262-278Meyer, V., G. Krefft and K. Lillelund,1989Moeller, R.B.,1996Oktay, M.,19981998Romer, A.S. and T. Parsond,19861986Takashima, F. and T. Hibiya,1993pp: 116-127pp: 116-127Tsuneki, K., H. Kobayashi and P.K. Pang,1984238307312Usinger, R.L. and T.I. Storer,1957pp: 498-499pp: 498-499Lloyd-Evans, P.,1994Scyliorhinus canicula.]]>4410611068Hoar, W.S. and D.J. Randall,1969pp: 140-167pp: 140-167