Toxicity of malachite green to the larvae of Penaeus monodon.

Abstract

The toxicity of malachite green to the larvae of the jumbo tiger prawn Penaeus monodon was determined in a static bioassay. Daily larval death was directly proportional to the chemical concentration of and exposure time to the dye. Estimates of the TL₅₀ in 24, 48, 72, and 96 h are as follows: 112.80, 30.61, 18.91 and 2.27 micrograms/l for the zoeae; 2502.65, 1105.63, 610.09 and 139.01 micrograms/l for the myses; and 2900.17, 339.28, 70.85, and 66.60 micrograms/l for the postlarvae. No adverse effects on the development and moulting of larvae were noted.