Direct and indirect effects of simulated calcareous dredge material on eggs and larvae of pink snapper Pagrus auratus

Journal of Fish Biology
G J Partridge, R J Michael

Abstract

The direct and indirect effects of a simulated, calcarenite-based dredge material on eggs and larvae of pink snapper Pagrus auratus were assessed. Direct effects were assessed by measuring hatch rate or survival of eggs and pre-feeding larvae, respectively, over a range of concentrations and exposure durations. Exposure of eggs to suspended solid concentrations up to 10 000 mg l(-1) for 24 h did not affect egg buoyancy or hatch rate, despite sediment adherence occurring at the two highest concentrations tested. Newly hatched larvae, whose mouths were still closed, were relatively tolerant of suspended solids, with a 12 h lethal concentration resulting in 50% mortality, LC(50), of 2020 mg l(-1) and a first observable effect concentration of 150 mg l(-1). Once the larvae's mouths opened, tolerance was significantly reduced, with a 12 h LC(50) of 157 mg l(-1) and a first observable effect concentration of 4 mg l(-1). Tolerance of larvae to suspended solids was negatively correlated with suspended solids concentration and exposure time, with exposure durations of <or=6 h being significantly less detrimental than those of 9 h or more. Indirect effects to larvae were assessed by measuring ingestion of copepod nauplii by 10 and 15 day...Continue Reading

References

Sep 1, 1982·Bulletin of Environmental Contamination and Toxicology·D D Johnston, D J Wildish
Nov 25, 1998·Comparative Biochemistry and Physiology. Part C, Pharmacology, Toxicology & Endocrinology·R S IsonoT Setoguma

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