Effects of turbidity on survival, osmoregulation and gill Na+-K+ ATPase in juvenile shrimp Penaeus japonicus

摘要: Penaeus japonicus juveniles were exposed for 3 wk to different turbidities of suspended sediments: control [2 + 2 nephelometric turbidity units (NTU)], medium (35 f 15 NTU) and high (65 NTU). The mortality rate increased after exposure Exposed late luveniles became less tolerant changes in ambient salinity showed hlgher mortalities at low salinity. effect on osmoregulatory capacity shrimps was examined by determining the osmotic gradient between haemolymph external concentrated seawater (42 9& S) dilute (15 O/m S). In young juveniles, capaclty generally not affected turbidity. it sign~ficantly reduced Reduced resulted from impaired regulation Na' Clconcentrations. Gill Na+-K' ATPase activity with turb~dity, apparently as a compensating reaction disruption ionic balance.