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Abstract

This study investigated the sublethal concentration of lead and calcium levels in yellowfin seabream juvenile (Acanthopagrus latus) (4.367 ± 0.470 cm; 1.408± 0.478 g) following exposure to a series of lead concentrations at various salinities (0‰, 9‰, 17‰, 25‰ and 34‰). Yellowfin seabream juveniles exposed to 17‰ salinity were the most tolerant to lead. After 96-h, the 50% lethal concentration (LC50) values were 0.33, 1.43, 3.78, 2.32 and 1.46 mg Pb2+ /L following exposure to 0‰, 9‰, 17‰, 25‰ and 34‰ salinities, respectively. The 6-, 12-, 24-, 48- and 96-h LC50 for fish exposed to 17‰ salinity were 124.67, 33.02, 10.40, 5.15 and 3.78 mg Pb2+ /L, respectively. The lead levels in fish body increased with increasing ambient lead concentrations in each acclimated salinity. Fish juvenile exposed to 17‰ salinity had the lowest lead accumulation compared with other exposure salinity exposures. The calcium levels decreased with decreasing salinity exposure and increasing ambient lead concentrations. The fish juvenile exposed to low salinity had a Pb2+ /Ca2+ ratio that was significantly higher than the high salinity experimental group with the same lead concentration exposure. In conclusion, the lead toxicity and accumulation of the fish juvenile were affected by salinity concentrations.

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