The objectives of this study were to evaluate the acute toxicity of copper in different life stages of shrimp Litopenaeus vannamei, and to determine the effect of sub-lethal copper concentrations on osmoregulatory capacity. In L. vannamei, the increase of the tolerance to copper is apt with the developmental stage. The 24 h LC50 values were low in nauplii and zoeae (between 11.98 and 25.25 νg Cu 1-1), and slightly increased in mysis (178.90 to 895.84 μg Cu 1-1). In mysis, the 48 h LC50 values were comprised between 84.89 and 368.90 μg Cu 1-1. After metamorphosis, the 48 h LC50 increased sharply. Post-larvae 10 (PL10) were less tolerant than PL5 after the exposure to copper for 24 and 48 h. However, after being exposed 96 h, the LC50 of PL10 (1577.37 μg Cu 1-1) was higher than that of PL5 (989.9 μg Cu 1-1). The most tolerant stage was juvenile. The 24 h, 48 h and 96 h LC50S of juvenile were 8576.58, 6387.65 and 2094.09 μg Cu 1-1, respectively. The juvenile of L. vannamei has low ability to maintain hemolymph osmoregulation under copper exposure. After the exposure to 675, 1325 and 2010 μg Cu 1-1 at salinity 15, the osmoregulatory capacity of exposed individuals significantly reduced by 70.3, 77.2, and 77.8% respectively compared to control animals.
|Number of pages||7|
|Journal||Cahiers de Biologie Marine|
|Publication status||Published - 2013|
- Litopenaeus vannamei