Effect of different microcystin profiles on toxin bioaccumulation in common carp ( Cyprinus carpio) larvae via Artemia nauplii

• Published in: Ecotoxicology and environmental safety 2010-07, Vol.73 (5), p.762-770
• Main Authors: El Ghazali, Issam, Saqrane, Sanaa, Carvalho, António Paulo, Ouahid, Youness, Del Campo, Francisca F., Oudra, Brahim, Vasconcelos, Vitor
• Format: Article
• Language: English
• Subjects: Accumulation; Animals; Artemia; Artemia - metabolism; Artemia salina; Carcinogens - metabolism; Carp; Carps - metabolism; Composition effects; Cyanobacterial blooms; Cyprinus carpio; Dominance; Fish; Fish growth; Food Chain; Freshwater; Larva - metabolism; Larvae; Microcystin variants; Microcystins - metabolism; Microcystins - toxicity; Microcystis; Microcystis - growth & development; Microcystis - metabolism; Microcystis aeruginosa; Toxicity; Toxins; Transfer
• ISSN: 0147-6513; 1090-2414
• DOI: 10.1016/j.ecoenv.2009.12.015

In this study, a 12-day growth trial was conducted to compare the effect of the variation in microcystin (MC) composition in two Microcystis aeruginosa bloom samples on the growth performance and MC accumulation/transfer in the common carp ( Cyprinus carpio L.) larvae. Fish were fed Artemia salina nauplii that had been preexposed to extracts from two M. aeruginosa natural blooms with different microcystins (MCs) profiles. Bloom A had MC-LR as major toxin (74.05%) while bloom B had a diversity of MC (MC-RR; MC-(H4)YR; MC-YR; MC-LR; MC-FR; MC-WR) with no dominance of MC-LR. Newly-hatched Artemia nauplii were exposed separately to the two M. aeruginosa extracts A and B (100 μg L −1 Eq MC-LR) for 2 h. The MC concentration in the nauplii was 73.60±7.88 ng Eq MC-LR g −1 FW ( n=4, mean±SE) for bloom A and 87.04±10.31 ng Eq MC-LR g −1 FW for bloom B. These contaminated nauplii were given at the same ration to different groups (A and B) of fish larvae. Larval weight and length from day 9 were significantly different between groups A and B, and in both cases lower than that of a control group fed non-exposed nauplii. MCs accumulation by larvae, inversely correlated with the growth performance, was also significantly different between groups A and B (37.43±2.61 and 54.55±3.01 ng Eq MC-LR g −1 FW, respectively, at the end of the experimental period). These results indicate that MC profile of a bloom may have differential effects on toxin accumulation/transfer and toxicity.