The Toxicity of Laboratory Burned Oil to the Amphipod Allorchestes compressa and the Snail Polinices conicus

摘要

Acute 96 h LC50 values of the burned-oil-water-accommodated-fraction (BWAF) and burned-oil-residue- mixture (BRM) were determined in semi-static bioassays with seawater, using the amphipod Allorchestes compressa (Dana). Sublethal bioassays (suppression of burying behaviour over 30 min and 24 h exposure) were also conducted for these toxicants, using the marine sand snail Polinices conicus (Lamarck) as the test The mean (n = 4) 96 h LC50 (S.E.) value for BWAF was 80 (4.l) and for BRM was greater than 100. No-observed-effect-concentration (NOEC) and lowest-observed-effect-concentra (LOEC) for the both toxicants were 40 and 60 respectively. The burying behaviour of the snails after 30 min exposure to both toxicants was not affected with NOEC values greater than 100. The 24 h FC50 (S.E.) value for BWAF was 60 (2.7) with 10 NOEC and 20 LOEC values. The respective 24 h EC50 value for BRM was greater than 100 with 40 NOEC and 60 LOEC values.