EFFECTS OF PFOS ON BURST SWIMMING PERFORMANCE AND METABOLIC RECOVERY IN JUVENILE SPINIBARBUS SINENSIS

To assess the effects of PFOS pollution on burst swimming performance and metabolic recovery of fish, juvenile Spinibarbus sinensis were exposed to different PFOS concentrations (0, 0.32, 0.8, 2 and 5 mg/L) for 28d. There after, the burst swimming speed (U_burst), relative U_burst (rU_burst), resting metabolic rate (RMR) and metabolic recovery after exhaustive swimming of the fish were measured. The results showed that PFOS had a profound effect on the U_burst and rU_burst of fish (P<0.05). TheU_burst and rU_burst were reduced by 17.4% and 10.8%, respectively, upon exposure to 5 mg/L PFOS. A possible non-monotonic dose response was found in rU_burst to PFOS. Moreover, PFOS significantly increased RMR (P<0.05), but did not have a marked effect on maximum metabolic rate (MMR), metabolic scope (MS), factorial metabolic scope (F-MS) and excess post-exercise oxygen consumption (EPOC) (P>0.05). The results indicated that PFOS had more dramatical effect on RMR than MMR of the experimental fish. Presumably, PFOS negatively impact survival-related activities such as capturing prey, avoiding predators, hunting for suitable habitats without significant ecotoxicological effects on metabolic recovery associated with anaerobic metabolism.