other پژوهشي Orginal research papers The effects of various salinity levels among (0&permil;, 5&permil;, 10&permil;, 15&permil;, and 20&permil;) for successful breeding of common carp, <em>Cyprinus carpio </em>were investigated<em>.</em> The duration of study was 75 days. Ripe broodstock (30) having a mean weight (male 1027&plusmn;2.4g and female 1084.8&plusmn;23g) were selected and stocked into spawning tanks (2000 L). The ratio among male and female was 2:1. They were fed with commercial floating pelleted feed having 35% crude protein with 2% body weight twice a day. Broodstock were injected with ovaprim hormone 0.5 mg kg^-1 female and male 0.2 mg kg^-1respectively, after successful spawning broodstock were removed from spawning tanks. The results showed that the highest fecundity, fertility, hatchability and survival of fry were obtained on salinity of 0&permil; to 10&permil; and significantly decreased on 15&permil; and 20&permil;. The eggs per gram body weight were also recorded in all treatments and highest eggs were obtained, i.e. 45-60 per female on salinity of 0&permil;-10&permil;.&nbsp; Water temperature (22.4&plusmn;0.2&deg;C), dissolved oxygen (6.5&plusmn;0.2 mg L^-1), pH (7.2&plusmn;0.2) and ammonia (less than 0.03&plusmn;0.06 mg L^-1) were monitored throughout the study period. Water quality parameters remained within the recommended range. Our results suggest that common carp, <em>C. carpio </em>may give maximum eggs up to 10 &permil; salinity with 81% survival of the fry. Common carp, Breeding, Ovaprim, Salinity, Semi-natural 790 804 http://jifro.ir/browse.php?a_code=A-10-2992-2&slc_lang=other&sid=1 A. Malik malik.cemb@gmail.com 100319475328460029631 100319475328460029631 Yes Centre of Excellence in Marine Biology, University of Karachi, Karachi, Pakistan; Centre of Excellence in Marine Biology, University of Karachi, Karachi, Pakistan; G. Abbas 100319475328460029632 100319475328460029632 No Centre of Excellence in Marine Biology, University of Karachi, Karachi, Pakistan; Centre of Excellence in Marine Biology, University of Karachi, Karachi, Pakistan; A. Jabbar 100319475328460029633 100319475328460029633 No Directorate of Fisheries Sindh, Livestock & Fisheries Department, Govt. of Sindh, Pakistan. Directorate of Fisheries Sindh, Livestock & Fisheries Department, Govt. of Sindh, Pakistan. S. Sajjad Shah 100319475328460029634 100319475328460029634 No Directorate of Fisheries Sindh, Livestock & Fisheries Department, Govt. of Sindh, Pakistan. Directorate of Fisheries Sindh, Livestock & Fisheries Department, Govt. of Sindh, Pakistan. A. Ali Muhammad 100319475328460029635 100319475328460029635 No Coastal Development and Fisheries Department, Govt. of Balochistan. Coastal Development and Fisheries Department, Govt. of Balochistan.