This study was carried out in order to determine population parameters of Planiliza abu in August 2014, May and July 2015 in Azaplı Lake and Kartalkaya Dam Lake, Ceyhan River Basin. A total of 370 specimens were analyzed. Age of the specimens ranged from 0 to VI. age groups and dominant age group was III (30.81%). Total length varied from 4.0-23.1 cm with the mean of 14.17±3.11 cm and total weight ranged from 1.06 to 160.10 with the mean of 39.49±24.95 g. Length-weight relationship were estimated W=0.0114L 3.022 . Estimated population parameters were calculated as L ∞ : 27.87 cm, k: 0.189 year -1 , t o : -1.09 year, Φꞌ: 2.89 and K: 1.13 for the population. Mortality and exploitation rates were also estimated as Z: 0.40, M: 0.33, F: 0.07 and E: 0.17, respectively. In the light of these values there were no over fishing pressure on the population.

This study was carried out to determine the population parameters of Garra rufa in Merzimen Stream, Euphrates River Basin between May and November 2013. A total of 365 specimens were caught by electro shocker. The age of the sampled specimens ranged from 0 to V age groups. Total length and weight varied from 2.9 to 16.8 cm with a mean of 9.67±3.52 cm and 0.21 to 69.27 g with a mean of 15.69±14.75 g, respectively. The length-weight relationship was obtained as W=0.0124L 2.9888 and the b value indicated the isometric growth. Estimated population parameters were calculated as L∞: 19.98 cm, k: 0.275, t0: -1.157. Fulton's condition factor and growth performance index were estimated as K: 1.24 and Φꞌ: 2.04. Total (Z), natural (M), and fishing (F) mortalities and the exploitation rate (E) were estimated 0.452, 0.295, 0.156, and 0.347, respectively.

respectively. In the light of these values have been estimated there were not any over fishing pressure on the population which is exploited optimally.

As a result of the field studies carried out between

Length-weight relationships (L-WRs) and condition factors were estimated for eight exotic fish species, including Oreochromis niloticus, Coptodon zillii, Carassius auratus, C. gibelio, Pseudorasbora parva, Gambusia holbrooki, Lepomis gibbosus, and Oncorhynchus mykiss from 10 basins of Turkish inland waters. A total of 1958 specimens were sampled in the years of 2014, 2017, 2018, and 2019 from 29 populations and their LWRs parameters, and form, Fulton’s, relative and mean condition factors were estimated. The estimated values of the parameter b ranged from 2.732 (C. auratus) to 3.319 (C. gibelio) with the mean and median values estimated at 3.013 and 3.047, respectively. The R2 values varied from 0.753 to 0.998, indicating a high degree of positive relationship between length and weight. The Fulton’s condition factor was estimated as 0.882 for P. parva and 2.002 for L. gibbosus. with the mean and median values of 1.397 and 1.453, respectively. This situation reveals that the condition values of all alien species except P. parva are quite high. In addition, the condition factor values of exotic fish species and local species they live with in Çıldır Lake were compared. As a result of this comparison, it was determined that C. gibelio had the highest condition factor value.