| In order to obtain basic data of blood cell index reflecting health of grass carp, grass carps were divided
into four size groups, differential blood count(DLC) of grass carps was studied and compared, and white blood cells changes
of grass carps treated with copper sulfate solution and trichlorphon as well as infected by Ichthyophthirius multifiliis were
observed. The results showed that the lymphocyte percentages of grass carps in 1 000 g and 500 g groups increased, and
were significantly higher than that in 250 g group. The neutrophil percentages of grass carps in 250 g and 60 g groups
increased and were significantly higher than those in 1 000 g and 500 g groups. The lymphocyte percentages of grass carps
treated with 8 mg/L or 0.7 mg/L copper sulfate prominently increased, and were significantly higher than that of control
group. The lymphocyte and thrombocyte percentages of grass carps treated with 8 mg/L trichlorphon greatly increased, and
were significantly higher than that of control group. The DLC of grass carps infected by I.multifiliis dramatically decreased
for neutrophils, and was significantly lower than that of control group, but increased for lymphocytes, and was significantly
higher than that of control group. The results indicated that the DLC of grass carp was affected by the body size, physical
and chemical stress factors and pathogen infection. |
