Survival, growth and physiological responses of juvenile Japanese flounder (Paralichthys olivaceus, Temminck & Schlegel, 1846) exposed to different dissolved oxygen concentrations and stocking densities

• DOI: 10.1111/jai.13369
• Publication Date: 2017-04-10T12:23:29Z
• Authors: H.-Y. Guo; X.-Y. Dong; X.-M. Zhang; P.-D. Zhang; W.-T. Li
• Keywords: Paralichthys; Olive flounder

The aim of this study was to determine what extent juvenile Japanese flounder can adapt different stocking densities in captivity and examine whether growth some physiological parameters critical for welfare might be affected by dissolved oxygen levels. (Paralichthys olivaceus) juveniles (initial weight 1.27 ± 0.04 g/fish) were reared at five (500, 1,000, 1,500, 2,000, 2,500 ind/m3) two levels (DO) concentration (5.5 0.5 mg/L or 14 2 mg/L) with duplicate tanks each treatment water-recirculating systems 40 days. Survival activity superoxide dismutase (SOD) not either density oxygen, whereas final body weight, specific rate (SGR) feed conversion efficiency (FCE) fish under low DO decreased significantly increasing density. In contrast, high unaffected the Furthermore, group had a higher intake and, consequently, grew faster achieved than level. A significant reduction hemoglobin (Hb) red blood cell (RBC) count recorded as increased. protease increased concentration. ventilation frequency results indicate that gill This demonstrates affect performance flounder. Also shown is pure supplementation an effective way improve when