en Biology & physiology Biology & physiology پژوهشي Orginal research papers <p dir="ltr" style="text-align: justify;">This study was carried out to determine population structure, growth and reproduction properties of barbel. A total of 198 individuals were sampled. Ages of samples were found between I and VI years, fork lengths between 4.3 and 16.6 cm and total weights between 1.2 and 65.8 g. Length-weight relationship was calculated as W=0.0146&times;L^2.934. Munro&rsquo;s phi prime index was estimated as 1.95, L_&infin; as 26.42 cm W_&infin; as 216.92 g, and condition factor as 1.265&plusmn;0.01. First sexual maturation was determined in 6.0-6.9 cm-group males, and second sexual maturity was recorded in 10.0-10.9 cm-group females. Individual fecundity was defined between 568 and 4171 eggs/female and relative fecundity was calculated as 64964.55&plusmn;5855.49 eggs/kg female. Barbel did not show good growth and reproduction performance in the stream, because of fishing pressure.</p> Barbel, Growth, Population structure, Reproduction, Çığlı stream 827 838 http://jifro.ir/browse.php?a_code=A-10-1272-198&slc_lang=en&sid=1 F. Şen fazilsen1@gmail.com 100319475328460016094 100319475328460016094 Yes Ö. Kara 100319475328460016095 100319475328460016095 No