Laboratory experiments were conducted to determine the effects of total dissolved gas （TDG） supersaturation on acute lethality and avoidance responses in juvenile rock carp （Procypris rabaudi Tchang）. The juvenile...Laboratory experiments were conducted to determine the effects of total dissolved gas （TDG） supersaturation on acute lethality and avoidance responses in juvenile rock carp （Procypris rabaudi Tchang）. The juvenile rock carp were exposed to water with different levels of supersaturation （105%, 115%, 120%, 125%, 130%, 135%, 140%, and 145%） and depth of 0.20 m at 25℃ for 60 h. Median lethal time （LT50） was used to assess the lethal responses corresponding to different levels of gas supersaturation. The results show that half of the juvenile rock carp died at the 120%, 125%, 130%, 135%, 140%, and 145% levels of supersaturation, and the LT50 corresponding to different levels of supersaturation was 18.7, 15.4, 8.2, 6.6, 3.5, and 1.7 h. When the level of supersaturated water is below 115%, the mortality is negligible. Avoidance responses were observed 5 min after the fish were put into equilibrated water （99%, 0.08 m deep） and water with different supersaturated levels （105%, 115%, 125%, 135%, and 145%, 0.08 m deep） at 25 ℃. The fish exhibited strong avoidance responses in supersaturated water when the gas supersaturation was above 135%. However, they exhibited an obvious preference to supersaturated water when the gas supersaturation was below 115%. Thus, the juvenile rock carp can likely survive in water with a supersaturated level of 115%.展开更多
Total dissolved gas supersaturation(TDGS) appears when the pressures of gases in a solution exceed the barometric pressures.TDGS is often caused by flood discharge at dams.It may lead to gas bubble disease(GBD) for fi...Total dissolved gas supersaturation(TDGS) appears when the pressures of gases in a solution exceed the barometric pressures.TDGS is often caused by flood discharge at dams.It may lead to gas bubble disease(GBD) for fish and biochemical responses of selected fish and other aquatic organisms.The purpose of this study was to determine the impact of long-term TDGS levels on the growth and biochemical responses of rock carp(Procypris rabaudi Tchang) dwelling in the upper reaches of the Yangtze River.Three-year-old rock carp were exposed to TDGS levels at 100%,104%,108%,112%,and 116% for 42 d.Samples were taken every 7 d after the start of the trial in order to determine catalase(CAT) and superoxide dismutase(SOD) activities in gill and muscle tissues.Samples were taken at Days 0 and 42 of exposure to determine growth rate.Little effect was found on growth rate in all treatment groups.SOD and CAT activities varied in different tissues,according to time of exposure and TDGS levels.The biochemical response of fish exposed to TDGS was more obvious in gill tissue than in muscle tissue.Surveys of SOD and CAT activities in different tissues offer important information about the effect of TDGS on the rare fish in the Yangtze River,and may help evaluate the risk to the aquatic eco-environment and aquatic ecosystem in the downstream of the Yangtze River.展开更多
This study aimed to investigate the morphological characteristics of Percocypris pingi pingi （Tchang） at the embryonic and postembryonic developmental periods and to demonstrate the early developmental stage of P. p...This study aimed to investigate the morphological characteristics of Percocypris pingi pingi （Tchang） at the embryonic and postembryonic developmental periods and to demonstrate the early developmental stage of P. pingi pingi （Tchang）. According to the results, the fully mature eggs were spherical, orange-col- ored, sticky, 2.2 mm in diameter; the maximum outer diameter reached 3.2 -3.8 mm after absorbing water. When water temperature was （18 -＋ 0.5） ~C, the first cleavage occun~ at 2h 28 min post-fertilization; organs began to form at 45 h 23 min post-fertilization; larvae were hatched at 126 h 28 min post-fertilization. Newly hatched larvae exhibited a total length of 10.4 mm, with large and compressed yolk sacs. According to the morphological characteristics, the embryonic de- velopmental process of P. pingi pingi （Tchang） could be divided into seven continuous stages, including fertilized egg stage, cleavage stage, blastula stage, early gastrula stage, neurala stage, organ formation stage and hatching stage, which were further divided into 32 phases. When water temperature ranged from 18.8 ~C to 25.0 ~C, the whole developmental process of P. pingi pingi （Tchang） from larvae to juveniles lasted 93 d. According to the morphological and ecological charac- teristics, the pestembryonic developmental process of P. pingi pingi （Tchang） could be divided into three stages, including yolk-sac larva stage, late larva stage and junenile stage. This study laid solid foundation for .展开更多
目的:研究不同生长阶段齐口裂腹鱼的生长状况、肌肉品质和脂蛋白脂酶(lipoprotein lipase,LPL)及脂肪酸合成酶(fatty acid synthetase,FAS)的基因表达。方法:分别选取齐口裂腹鱼幼鱼(137.8±1.7) g(S组)、亚成鱼(312.4±11.8) ...目的:研究不同生长阶段齐口裂腹鱼的生长状况、肌肉品质和脂蛋白脂酶(lipoprotein lipase,LPL)及脂肪酸合成酶(fatty acid synthetase,FAS)的基因表达。方法:分别选取齐口裂腹鱼幼鱼(137.8±1.7) g(S组)、亚成鱼(312.4±11.8) g(M组)、成鱼(500.9±31.4) g(L组),测定形体指标、脏器指数和肌肉主要营养成分含量,并采用实时荧光定量聚合酶链式反应测定LPL及FAS的基因表达水平。结果:与S组相比,M组、L组肥满度、肝体比、肠脂比、水分含量均有所降低(P<0.05),粗蛋白、粗灰分含量变化不大;L组肌间脂肪(intermuscular fat,IMF)含量最低(P<0.05);而S组、M组与L组肝胰脏中LPL m RNA及FAS m RNA表达水平均基本高于肌肉(P<0.05),且L组肝胰脏中LPL m RNA及FAS m RNA表达水平均最低(P<0.05),M组肌肉中LPL m RNA及FAS m RNA表达水平最高(P<0.05)。结论:齐口裂腹鱼的肌肉主要营养成分含量在成鱼阶段有所降低,且IMF含量与LPL m RNA及FAS m RNA表达水平呈一定正相关。展开更多
基金Project (No. 50979063) supported by the National Natural Science Foundation of China
文摘Laboratory experiments were conducted to determine the effects of total dissolved gas （TDG） supersaturation on acute lethality and avoidance responses in juvenile rock carp （Procypris rabaudi Tchang）. The juvenile rock carp were exposed to water with different levels of supersaturation （105%, 115%, 120%, 125%, 130%, 135%, 140%, and 145%） and depth of 0.20 m at 25℃ for 60 h. Median lethal time （LT50） was used to assess the lethal responses corresponding to different levels of gas supersaturation. The results show that half of the juvenile rock carp died at the 120%, 125%, 130%, 135%, 140%, and 145% levels of supersaturation, and the LT50 corresponding to different levels of supersaturation was 18.7, 15.4, 8.2, 6.6, 3.5, and 1.7 h. When the level of supersaturated water is below 115%, the mortality is negligible. Avoidance responses were observed 5 min after the fish were put into equilibrated water （99%, 0.08 m deep） and water with different supersaturated levels （105%, 115%, 125%, 135%, and 145%, 0.08 m deep） at 25 ℃. The fish exhibited strong avoidance responses in supersaturated water when the gas supersaturation was above 135%. However, they exhibited an obvious preference to supersaturated water when the gas supersaturation was below 115%. Thus, the juvenile rock carp can likely survive in water with a supersaturated level of 115%.
基金Project (No. 50979063) supported by the National Natural Science Foundation of China
文摘Total dissolved gas supersaturation(TDGS) appears when the pressures of gases in a solution exceed the barometric pressures.TDGS is often caused by flood discharge at dams.It may lead to gas bubble disease(GBD) for fish and biochemical responses of selected fish and other aquatic organisms.The purpose of this study was to determine the impact of long-term TDGS levels on the growth and biochemical responses of rock carp(Procypris rabaudi Tchang) dwelling in the upper reaches of the Yangtze River.Three-year-old rock carp were exposed to TDGS levels at 100%,104%,108%,112%,and 116% for 42 d.Samples were taken every 7 d after the start of the trial in order to determine catalase(CAT) and superoxide dismutase(SOD) activities in gill and muscle tissues.Samples were taken at Days 0 and 42 of exposure to determine growth rate.Little effect was found on growth rate in all treatment groups.SOD and CAT activities varied in different tissues,according to time of exposure and TDGS levels.The biochemical response of fish exposed to TDGS was more obvious in gill tissue than in muscle tissue.Surveys of SOD and CAT activities in different tissues offer important information about the effect of TDGS on the rare fish in the Yangtze River,and may help evaluate the risk to the aquatic eco-environment and aquatic ecosystem in the downstream of the Yangtze River.
基金Supported by Special Fund for Scientific Research in the Public Interest from the Ministry of Agriculture"Protection and Utilization of Fish Resources in the Middle Reach of Brahmaputra River"(201403012)Youth Fund for Breeding Project from Sichuan Department of Finance(2009QNJJ-022)
文摘This study aimed to investigate the morphological characteristics of Percocypris pingi pingi （Tchang） at the embryonic and postembryonic developmental periods and to demonstrate the early developmental stage of P. pingi pingi （Tchang）. According to the results, the fully mature eggs were spherical, orange-col- ored, sticky, 2.2 mm in diameter; the maximum outer diameter reached 3.2 -3.8 mm after absorbing water. When water temperature was （18 -＋ 0.5） ~C, the first cleavage occun~ at 2h 28 min post-fertilization; organs began to form at 45 h 23 min post-fertilization; larvae were hatched at 126 h 28 min post-fertilization. Newly hatched larvae exhibited a total length of 10.4 mm, with large and compressed yolk sacs. According to the morphological characteristics, the embryonic de- velopmental process of P. pingi pingi （Tchang） could be divided into seven continuous stages, including fertilized egg stage, cleavage stage, blastula stage, early gastrula stage, neurala stage, organ formation stage and hatching stage, which were further divided into 32 phases. When water temperature ranged from 18.8 ~C to 25.0 ~C, the whole developmental process of P. pingi pingi （Tchang） from larvae to juveniles lasted 93 d. According to the morphological and ecological charac- teristics, the pestembryonic developmental process of P. pingi pingi （Tchang） could be divided into three stages, including yolk-sac larva stage, late larva stage and junenile stage. This study laid solid foundation for .
基金The National Natural Science Foundation of China(30670226)the National Key Scientific Program of China(2009CB941200)+1 种基金the Postdoctoral Research Foundation of Southwest University(2005-05)China Three Gorges Corporation Research Project to Y.Li
文摘目的:研究不同生长阶段齐口裂腹鱼的生长状况、肌肉品质和脂蛋白脂酶(lipoprotein lipase,LPL)及脂肪酸合成酶(fatty acid synthetase,FAS)的基因表达。方法:分别选取齐口裂腹鱼幼鱼(137.8±1.7) g(S组)、亚成鱼(312.4±11.8) g(M组)、成鱼(500.9±31.4) g(L组),测定形体指标、脏器指数和肌肉主要营养成分含量,并采用实时荧光定量聚合酶链式反应测定LPL及FAS的基因表达水平。结果:与S组相比,M组、L组肥满度、肝体比、肠脂比、水分含量均有所降低(P<0.05),粗蛋白、粗灰分含量变化不大;L组肌间脂肪(intermuscular fat,IMF)含量最低(P<0.05);而S组、M组与L组肝胰脏中LPL m RNA及FAS m RNA表达水平均基本高于肌肉(P<0.05),且L组肝胰脏中LPL m RNA及FAS m RNA表达水平均最低(P<0.05),M组肌肉中LPL m RNA及FAS m RNA表达水平最高(P<0.05)。结论:齐口裂腹鱼的肌肉主要营养成分含量在成鱼阶段有所降低,且IMF含量与LPL m RNA及FAS m RNA表达水平呈一定正相关。
