Author(s): Wen Jiang; Xiaoqing Liu; Yuexia Zhang; Shichao Chen; Zhiguang Zhang; Kefeng Li
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Keywords: Total dissolved gas supersaturation (TDGS); Tolerance; Rock carp (Procypris rabaudi Tchang); Prenant’s schizothoracin (Schizothorax prenanti Tchang); Chinese sucker (Myxocyprinus asiaticus Bleeker)
Abstract: The total dissolved gas supersaturation (TDGS) appears in the downstream of high-dam when flood discharged. TDGS may cause gas bubble disease (GBD) in fish and increased mortality. The purpose of this study was to determine the acute lethal response of TDGS on the endemic fish residing in the upper reaches of Yangtze River, such as juvenile rock carp (Procypris rabaudi Tchang), prenant’s schizothoracin (Schizothorax prenanti Tchang) and chinese sucker (Myxocyprinus asiaticus Bleeker). The median lethal time (LT50) of juvenile rock carp exposed to TDGS was 3. 40h, 4. 01h, 4. 32h, 6. 39h and 11. 14h in different levels of TDGS (145% , 140% , 135% , 130% and 125% ), respectively. The LT50 of juvenile prenant’s schizothoracin was 2. 61h, 3. 96h, 5. 46h, 13. 67h and 19. 14h. The LT50 of juvenile chinese sucker was 3. 21h, 4. 67h, 7. 81h, 9. 19h and 49. 06h. In addition, the results indicated that median lethal concentration (LC50) of juvenile rock carp, which was exposed to TDG supersaturated water continuously for 4h, 6h, 8h and 10h, was 139% , 130% , 128% and 127% , respectively. The LC50 of juvenile prenant’s schizothoracin was 137% , 134% , 133% and 132% . The LC50 of juvenile chinese sucker was 142% , 138% , 135% and 130% . Tolerances of different species exposed to TDG supersaturated water were various. Compared with juvenile rock carp and prenant’s schizothoracin, juvenile chinese sucker showed highest tolerance to TDGS. Juvenile prenant’s schizothoracin had more tolerance than that of juvenile rock carp.
Year: 2013