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Turkish Journal of Fisheries and Aquatic Sciences 2012, Vol 12, Num, 2     (Pages: 191-197)

Comparison of Reproduction Characteristics and Broodstock Mortality in Farmed and Wild Eurasian Perch (Perca fluviatilis L.) Females During Spawning Season Under Controlled Conditions

Jiří Křišťan 1 ,Vlastimil Stejskal 1 ,Tomáš Policar 1

1 University of South Bohemia in České Budějovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Institute of Fish Culture and Hydrobiology, Zátiší 728/II., 389 25 Vodňany, Czech Republic DOI : 10.4194/1303-2712-v12_2_01 Viewed : 4049 - Downloaded : 4300 Reproduction characteristics and broodstock mortality were compared in farmed perch (FP) and wild perch (WP) under controlled conditions. Thirty-six farmed females (FF) (92.3%) and 30 wild females (WF) (76.9%) spawned during the reproductive season. Absolute fecundity in FF was 18 660±6 809 eggs per female compared to 31,081±3,276 eggs per female in WF. Similar differences were observed in relative fecundity (FF 112,470±13,370 eggs per kg body weight and WF 137,054±18,513 eggs per kg body weight). No significant differences in fertilization rate (FR), larval resistance (LR) and larval total length (LTL) were found (FR - 91.9±6.9% and 90.5±6%; LR - 51.1±25.2% and 53.5±26.2%; LTL - 5.88±0.55 mm and 5.82±0.51 mm in FP and WP, respectively). The highest differences were found in hatching rates of 27.9±9.3% in FP and 62.0±16.0% in WP. No mortalities were observed during the reproductive season, but post-spawning mortality among WP was 92.5±2.5% of females compared with 21.5±12.5% in FP. Keywords : Wild perch, farmed perch, fecundity, fertilization rate, hatching rate, mortality