Semen Cryopreservation for the Mediterranean Brown Trout of the Biferno River (Molise-Italy): Comparative Study on the Effects of Basic Extenders and Cryoprotectants

Overview

Journal Sci Rep

Specialty Science

Date 2019 Jul 6

PMID 31273238

Citations 5

Authors

Michele Di Iorio

Stefano Esposito

Giusy Rusco

Alessandra Roncarati

Marsia Miranda

Pier Paolo Gibertoni

Silvia Cerolini

Nicolaia Iaffaldano

Affiliations

Soon will be listed here.

Abstract

This study was designed to optimize the semen freezing protocol of the native Mediterranean brown trout inhabiting the Molise rivers through two experiments: an in vitro analysis of the effects of two basic extenders combined with three cryoprotectants on post-thaw semen quality; and an in vivo test to assess the fertilization and hatching rate. Semen was diluted at a ratio of 1:3 in a freezing medium composed of a glucose extender (A) or mineral extender (B). Each basic component contained 10% dimethylsulfoxide, dimethylacetamide or methanol. The post-semen quality was evaluated considering motility, duration of motility, viability and DNA integrity. The basic extender and cryoprotectant were shown to have significant effects on these variables, and the best results were obtained using extender A or B combined with dimethylsulfoxide (P < 0.05). These freezing protocols were selected for fertilization trials in vivo. Fertilization and hatching rates were significantly higher in fresh semen. No significant differences were observed in frozen semen using extender A or B, although higher percentages of eyed eggs and hatching rates were recorded using extender A. According to our in vitro and in vivo results, the glucose-based extender and dimethylsulfoxide emerged as the best combination for an effective cryopreservation protocol for semen of this trout.

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