Wild Salmo trutta labrax from the Bıçkı Stream in the Marmara Region: Gamete Quality and First Reproduction Under Aquaculture Conditions

Abstract

In this study, the quality and reproductive success of wild Black Sea Trout (Salmo trutta labrax) wereinvestigated. In total 32 wild trout (27.3±13.6 g and 13.9±2.3 cm) from the Bıçkı Stream in KocaeliProvince in the Marmara Region were kept in circular fiberglass outdoor flow-through tanks (1.5mø) at the mean water temperature of 11.8±4.5 °C. In November 2016, when the water temperaturewas 8.4 °C, the first spawning of wild trout occurred. Sperm volume (ml), Motility (%) and VCL (µm/sec) values were determined to be 7.5±2.5, 70.42±0.83 and 70.35±3.98, respectively. The weight(g), total fecundity and egg diameter (mm) values of female fish were listed to be 513.75±78,1.171±171, and 3.84±0.02, respectively. In the experiment, 5.859 wild Black sea trout eggs werefertilized. The eyed-egg stage occurred 24 days (288 day-degree) post fertilization and the survivalrate from fertilization to the eyed-stage was 28%. Wild Black Sea trout larvae from P1 (PaternalGeneration) hatched 48 days after fertilization with the hatching rate of 7%.