Changes in Sperm Production,Sperm Motility,and Composition of Seminal Fluid in Caspian Brown Trout,Salmo trutta caspius,Over the Course of a Spawning Season |
| |
| Authors: | Saeed Hajirezaee Bagher Mojazi Amiri Ali Reza Mirvaghefi |
| |
| Institution: | 1. Department of Fisheries and Environmental Sciences , Faculty of Natural Resources, University of Tehran , Karaj, Iran Shrezaee@yahoo.com;3. Department of Fisheries and Environmental Sciences , Faculty of Natural Resources, University of Tehran , Karaj, Iran |
| |
| Abstract: | This study was carried out to evaluate milt quality in male Caspian brown trout (Salmo trutta caspius) over the course of the winter spawning season. Milt samples were collected biweekly during December and January. Chemical composition of seminal fluid, sperm production (milt volume, sperm density, spermatocrit,) and sperm motility characteristics (percentage and duration of motility) were measured. Milt volume, sperm density, osmolality, seminal minerals (Ca2+, Mg2+, K+, Na+, Cl?), and total protein gradually decreased over the spawning season. Glucose and triglyceride content of milt did not show significant changes over the spawning season. Milt pH and the percentage and duration of motility were comparatively stable, declining only at the end of the season. Significant positive correlations were found between sperm density and seminal minerals, total protein and spermatocrit; percentage of motile spermatozoa and seminal minerals, total protein; and duration of motility and K+, Cl?, total protein, and pH. Results show that season has a significant influence on milt quality in male Caspian brown trout, with the best milt being available at the beginning of spawning season. |
| |
| Keywords: | sperm motility sperm density spawning season temperature Caspian brown trout |
|
|
