(I) The methods for determining hemoglobin content (Hb), erythrocyte sedimentation rate (E.S.R.) and hematocrit (Ht) of the blood of young carp were critically tested and the proper methods were settled.
(2) Normal values of Hb, E.S.R., Ht and M.C.H.C. of the blood of young carp were determined in winter and in spring.
(3) The blood of the carp gave lower Hb and Ht, but higher E.S.R. and M.C.H.C. in winter than in spring.
(4) The blood of the carp starved for seven weeks gave abnormal values on various blood characteristics.