This experiment showed that the haemolymph total protein content significantly increased in freshwater prawn fed with 0.4% anthraquinone extract before the stress, in freshwater prawn treated with 0.2% anthraquinone extract at 6 h and 12 h after stress, and in freshwater
prawn treated with 0.4% anthraquinone extract at 12 h, 24 h after the stress as well.