en aquaculture aquaculture كاربردي Orginal research papers <span lang="TR" style="font-size:11.0pt"><span calibri="" style="font-family:"><span style="color:black">Rainbow trout (<i>Oncorhynchus mykiss</i>; Kamloops strain), were introduced to Khyber Pakhtunkhwa in 1928 and are now successfully farming in the Malakand and Hazara divisions due to the region&#39;s favorable cold-water conditions. Our study investigated the artificial breeding success, incubation period, and fecundity of rainbow trout at Jaghour trout hatchery in the district Chitral. A total of 4,311 eggs were harvested from four females with a combined body weight of 1.264 kg.</span></span></span><span lang="TR" style="font-size:11.0pt"><span calibri="" style="font-family:"> <span style="color:black">The eggs were fertilized and incubated in spring water at temperatures ranging from 12.6 to 13.3&deg;C.</span> The <span style="color:black">survival and mortality rates from fertilization to hatching were approximately 79% and 21%, respectively. The eyed stage commenced at around 155&plusmn;05 degree days (</span>D&deg;<span style="color:black">), with hatching occurring at approximately 305&plusmn;05</span> D&deg;<span style="color:black">. The incubation period spanned from 305&plusmn;05 to 349&plusmn;05 </span>D&deg;<span style="color:black">. Furthermore, the study explores female fecundity, revealing a range of 1.87 to 3.42 eggs per gram of body weight (n=15). The size of green ova increased by 1.02% to 8.60% during water hardening at 9&deg;C for 1.5 h (n=46). Our study provides valuable insights into the incubation period of Rainbow trout, highlighting the survival and mortality rates of fertilized eggs in spring water</span>. <span style="color:black">This information can assist local hatchery managers in estimating seed production from known brood stock.</span></span></span> Spawning period, Stripping, Gamete quality parameters, Water hardening, Eyed eggs 85 97 http://jifro.ir/browse.php?a_code=A-10-4709-3&slc_lang=en&sid=1 A. Jan Aminjan7007@gmail.com 100319475328460055085 100319475328460055085 No Institute of Zoological Sciences University of Peshawar Pakistan F. Zaidi Zaidi_farrah@uop.edu.pk 100319475328460055086 100319475328460055086 No Institute of Zoological Sciences University of Peshawar Pakistan Z. Tariq zarkishtariq8090@gmail.com 100319475328460055087 100319475328460055087 No Department of Zoology, University of Science and Technology Bannu, Khyber Pakhtunkhwa, Pakistan F.U. Rehman Faiz02140@gmail.com 100319475328460055088 100319475328460055088 Yes Department of Zoology, Government Superior Science College Peshawar, 25000, Khyber Pakhtunkhwa, Pakistan S.B. Rasheed basitrasheed@uop.edu.pk 100319475328460055089 100319475328460055089 No Institute of Zoological Sciences University of Peshawar Pakistan H. Ullah uhabib239@gmail.com 100319475328460055090 100319475328460055090 No Institute of Zoological Sciences University of Peshawar Pakistan T. Ahmad tariq.zoologist@yahoo.com 100319475328460055091 100319475328460055091 No College of Wildlife and Protected Area, Northeast Forestry University, No. 26, Hexing Road, Harbin 150040, P.R. China