Abstract

RAMIREZ-MERLANO, Juan; MEDINA-ROBLES, Víctor  and  CRUZ-CASALLAS, Pablo. Stational variation on seminal characteristics in bagre rayado Pseudoplatystoma metaense (Telostei, pimelodidae). Rev.MVZ Cordoba [online]. 2011, vol.16, n.1, pp.2336-2348. ISSN 0122-0268.

Objective. To determine the quality variation, the ionic content and the osmolality in Pseudoplatystoma metaense seminal plasma during the reproductive period. Materials and methods. Sexually mature males were used during a reproductive season (march to august). The spermiation was induced with Carp Pituitary Extract (4 mg/kg). Volume (mL), masal motility (%), activation time (sc), spermatocrit (%), sperm concentration (10⁶ sptz/µL) and viability (%) were evaluated. Also, motility (%) and individual speed through a Computer-Assisted Semen Analysis (CASA) were determined. The Osmolarity (mOsm/kg), the ions (Na⁺, Cl⁺, K⁺ and Mg²⁺) and the glucose concentration were determined in seminal plasma obtained by centrifugation at 14.000 g. The ions and glucose concentration were established through a reflectance system. Results. Sperm showed masal motility greater than 90%, with the lowest rapid linear progressive motility in the month of april (34.9±9.0%) and general levels of spermatozoa inmotile less than 10%. The seminal plasma showed an osmolarity of 259.3±3.5 mOsm/kg, with an average concentration of glucose and ions Na⁺, Cl⁺, K⁺ and Mg²⁺ of 142.7±2.8, 118±2.2, 4.8±0.4 and 0.33±0.0 mmol/L, respectively, during the reproductive season. Conclusions. The semen quality of bagre rayado presented no changes during the breeding season, and showed a high quality for the process of fertilization.

Keywords : Pseudoplatystoma metaense; sperm; reproduction.

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