Common silver barb, Puntius gonionotus, exposed to the nominal concentration of 0.06 mg/L Cd for 60 d, were assessed for histopathological alterations （gills, liver and kidney）, metal accumulation, and metallothione...Common silver barb, Puntius gonionotus, exposed to the nominal concentration of 0.06 mg/L Cd for 60 d, were assessed for histopathological alterations （gills, liver and kidney）, metal accumulation, and metallothionein （MT） mRNA expression. Fish exhibited pathological symptoms such as hypertrophy and hyperplasia of primary and secondary gill lamellae, vacuolization in hepatocytes, and prominent tubular and glomerular damage in the kidney. In addition, kidney accumulated the highest content of cadmium, more than gills and liver. Expression of MT mRNA was increased in both liver and kidney of treated fish. Hepatic MT levels remained high after fish were removed to Cd-free water. In contrast, MT expression in kidney was peaked after 28 d of treatment and drastically dropped when fish were removed to Cd-free water. The high concentrations of Cd in hepatic tissues indicated an accumulation site or permanent damage on this tissue.展开更多
Objective:To explore the growth performance of low-cost mobile hatchery produced silver barb(Barbodes gonionotus)fingerling comparing with typical one,field laboratory complex hatchery.Methods:Assigning Treatment I an...Objective:To explore the growth performance of low-cost mobile hatchery produced silver barb(Barbodes gonionotus)fingerling comparing with typical one,field laboratory complex hatchery.Methods:Assigning Treatment I and Treatment II stoked with low-cost mobile hatchery and field laboratory complex hatchery originated fingerling of silver barb in plastic circular tank.Results:The average weight gain(g/day)of fish was 0.18 and 0.16 g,length gain(cm/d)0.03 and 0.02,gross yield 0.09 and 0.08 kg/tank per month,net yield 0.03 and 0.01 kg/tank per month respectively in Treatment I and Treatment II.The growth of low-cost mobile hatchery produced silver barb was higher(P<0.05)although SGR(%/d)was 1.63 and 1.89 and FCR was 2.57 and 2.55 for Treatment I and Treatment II,correspondingly and survival was 100%in both cases.In case of economic efficiency,total operating cost were BDT 68.91 and 67.41,revenue BDT 107.35 and 89.30,net profit BDT 38.44 and 21.89 and BCR 1.55 and 1.32 respectively in low-cost mobile hatchery and field laboratory complex hatchery produced fishes.Conclusions:The fry from both origins showed more or less similar growth performance and none of them was superior.Considering the economic feasibility in both cases,it is assumed that the intensive culture of silver barb is possible at field level.展开更多
文摘Common silver barb, Puntius gonionotus, exposed to the nominal concentration of 0.06 mg/L Cd for 60 d, were assessed for histopathological alterations （gills, liver and kidney）, metal accumulation, and metallothionein （MT） mRNA expression. Fish exhibited pathological symptoms such as hypertrophy and hyperplasia of primary and secondary gill lamellae, vacuolization in hepatocytes, and prominent tubular and glomerular damage in the kidney. In addition, kidney accumulated the highest content of cadmium, more than gills and liver. Expression of MT mRNA was increased in both liver and kidney of treated fish. Hepatic MT levels remained high after fish were removed to Cd-free water. In contrast, MT expression in kidney was peaked after 28 d of treatment and drastically dropped when fish were removed to Cd-free water. The high concentrations of Cd in hepatic tissues indicated an accumulation site or permanent damage on this tissue.
文摘Objective:To explore the growth performance of low-cost mobile hatchery produced silver barb(Barbodes gonionotus)fingerling comparing with typical one,field laboratory complex hatchery.Methods:Assigning Treatment I and Treatment II stoked with low-cost mobile hatchery and field laboratory complex hatchery originated fingerling of silver barb in plastic circular tank.Results:The average weight gain(g/day)of fish was 0.18 and 0.16 g,length gain(cm/d)0.03 and 0.02,gross yield 0.09 and 0.08 kg/tank per month,net yield 0.03 and 0.01 kg/tank per month respectively in Treatment I and Treatment II.The growth of low-cost mobile hatchery produced silver barb was higher(P<0.05)although SGR(%/d)was 1.63 and 1.89 and FCR was 2.57 and 2.55 for Treatment I and Treatment II,correspondingly and survival was 100%in both cases.In case of economic efficiency,total operating cost were BDT 68.91 and 67.41,revenue BDT 107.35 and 89.30,net profit BDT 38.44 and 21.89 and BCR 1.55 and 1.32 respectively in low-cost mobile hatchery and field laboratory complex hatchery produced fishes.Conclusions:The fry from both origins showed more or less similar growth performance and none of them was superior.Considering the economic feasibility in both cases,it is assumed that the intensive culture of silver barb is possible at field level.
