Sex steroids in the seminal fluid and milt quality indices in the endangered Caspian brown trout, Salmo trutta caspius

Abstract

In this study, the relationships between the seminal fluid sex steroids sperm quality parameters (i.e. sperm motility and sperm production were investigated in the endangered Caspian brown trout. According to results, the variation of sex steroid concentrations was comparatively high. The seminal fluid levels of 17α‐Hydroxyprogesterone (OHP) had positive correlation with percentage and duration of sperm motility. Similar correlation was found between the seminal fluid concentration of testosterone (T) and estradiol‐17β (E2) with sperm concentration. As well as, there was no significant correlation between progesterone (P) with sperm quality indices. The significant correlation of some steroids i.e. OHP, T and E2 and sperm quality parameters of Caspian brown trout confirms the key role of these steroids in acquisition of the potential of motility during final stage of the maturation.

Improvement of techniques for sperm evaluation and cryobanking in European eel.

“…This low response in terms of motility in the groups receiving the lowest doses could be due to a hormonal failure in the maturation process. In this sense, an insufficient weekly dose of gonadotropin could generate a deficient production of steroidogenic enzymes, which in turn would produce a low production of the steroids involved in gonadal maturation, therefore causing a poor production of good quality sperm (Jamalzadeh et al, 2014;Peñaranda et al, 2010c;Schulz and Miura, 2002). Throughout the bibliography, the most common dose applied in fish has been 1 IU/g fish, but doses are usually species-dependent, varying from 0.15 IU/g fish in pikeperch (Sander lucioperca) (Falahatkar and Poursaeid, 2014) to 50 IU/g fish in silver perch (Leiopotherapon plumbeus) (Denusta et al, 2014).…”