Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2006.549.552Theodoxus macri (Neritidae: Prosobranchia) from Azraq Oasis, Jordan]]>ElkarmiAli Z.IsmailNaim S.3200693A total of 371 specimens of the freshwater gastropod Theodoxus macri (Sowerby, 1849) (Neritidae: Prosobranchia) from Azraq Oasis, Jordan, were studied for age, growth and shell morphometrics. The results show the life span to be four years. The mean observed lengths of the four age cohorts range from 3.295 to 7.707 mm. Theoretically, using Von Bertalanffys and Richards growth formulae, the maximum length of this snail may reach 17.187 and 12.930 mm, respectively. Shell and dry body weights averaged 44.4 and 36.05 mg, respectively. The relationships of the shell length to shell and dry body weights are curvilinear. However, the relationships of the shell length to shell width, aperture length and aperture width are linear. The relative coefficient (Kn) was 1.008 and 0.999 for young (age groups 1-2) and old (age groups 3-4) snails, respectively.]]>Abel-Hafez, S.K. and N.S. Ismail,1987Theodoxus jordani snails in Yarmouk river, Jordan and its seasonal infection with larval trematodes.]]>5463470Burch, J.B.,1985Dagan, D.,1971Theodoxus (Gastropoda, Neritidae).]]>20223229Ismail, N.S. and S.K. Abel-Hafez,1987Melanopsis praemorsa (L. 1785) (Thiaridae) snails in Yarmouk river, Jordan and its seasonal infection with larval trematodes.]]>5287299Ismail, N.S. and A.Z. Elkarmi,1999Cellana radiata (Born, 1778) form the Gulf of Aqaba, Red Sea.]]>586169Ismail, N.S., A.Z. Elkarmi and S.M. Al-Moghrabi,2000Drupella cornus (Gastropoda: Prosobranchia) in the Gulf of Aqaba, Red Sea.]]>29165170Le-Cren, E.D.,1951Perca fluviatilis).]]>20201210Ostle, B. and R.W. Mensing,1975pp: 206pp: 206Ott, L.,19841st Edn.,pp: 482pp: 482