en Ecology Ecology پژوهشي Orginal research papers <em>Capoeta buhsei</em> is native species in the Namak Lake basin and biological aspects of life history of this fish in Iranian waters is not very well known. Life history of this fish examined by collecting 92 samples in Gharachay River. Sampling done by using Electroshoker in July and January 2011 and October 2012. The maximum age was found +4 years in female. Sex Ratio (male: female) was 1:0.73, and length &ndash;weight relationship was BW=35.55.TL^3.2 in male and BW=14.8. TL^3.07 in female. Mean egg diameter (ED) was 0.8726<img alt="" height="17" src="file:///C:/Users/GH39BB~1.ALI/AppData/Local/Temp/msohtmlclip1/01/clip_image002.png" width="15" >0.12 mm ranging from 0.67 to 1.1 mm. Mean absolute (AF) and relative fecundity (RF) were 4917.2157 (<img alt="" height="17" src="file:///C:/Users/GH39BB~1.ALI/AppData/Local/Temp/msohtmlclip1/01/clip_image002.png" width="15" >1690.04 SE) egg female^-1 and 69.1 (<img alt="" height="17" src="file:///C:/Users/GH39BB~1.ALI/AppData/Local/Temp/msohtmlclip1/01/clip_image002.png" width="15" >16.15 SE) eggs g^-1 body weight, respectively.<br> &nbsp;&nbsp;&nbsp; AF and ED were found to increase significantly with increasing fish size, whereas RF increased significantly with both fish TL and weight.<br> &nbsp; Capoeta buhsei, Life history, Egg diameter, Reproduction, Fecundity 790 797 http://jifro.ir/browse.php?a_code=A-10-1584-1&slc_lang=en&sid=1 Z. yazdani z92.yazdani@gmail.com 100319475328460031122 100319475328460031122 No Department of Fisheries, Science and Research Branch, Islamic Azad University, Tehran, Iran S. Vatandoust S.vatandoust@gmail.com 100319475328460031123 100319475328460031123 No Department of Fisheries, Babol Branch, Islamic Azad University, Babol, Iran J. Khayatzadeh j.khayatzadeh@mshdiau.ac.ir 100319475328460031124 100319475328460031124 Yes Department of Biology, Science Faculty, Islamic Azad university University, Mashhad Branch, Mashhad, Iran