Zafar Iqbal, Sonia A Shukerova and Imtiaz K Minhas
Keywords: Posthodiplostomum cuticola, black spot disease, Labeo rohita, fry, control
Abstract: Two hundred fry of Labeo rohita were obtained from Central Fish Seed Hatchery Lahore. The mean total length of fry was 20.47 mm. The fry were examined to be infected with metacercaria of a digenetic fluke Posthodiplostomum cuticola. The infection resulted in the formation of black spots on the skin of fry. This infection is commonly called as a Black spot disease or Posthodiplostomasis in fish. The prevalence of P. cuticola was 100% and mean intensity of infection was 4.495. The size of metacercaria varied from 0.70 - 0.98 mm. A moderate significant relationship existed between the total length of the fry and number of black spots (r2 = 0.15). The black spots were randomly distributed on the body of fry. The ventral side of the fry (Section-I); was having a significantly higher number of the black spots than the dorsal side (Section II) (?2 = 3.75; P = 0.05). No skeletal deformation was observed in the infected fry. The black spot disease in L. rohita fry, its relationship to pond management and control is discussedTwo hundred fry of Labeo rohita were obtained from Central Fish Seed Hatchery Lahore. The mean total length of fry was 20.47 mm. The fry were examined to be infected with metacercaria of a digenetic fluke Posthodiplostomum cuticola. The infection resulted in the formation of black spots on the skin of fry. This infection is commonly called as a Black spot disease or Posthodiplostomasis in fish. The prevalence of P. cuticola was 100% and mean intensity of infection was 4.495. The size of metacercaria varied from 0.70 - 0.98 mm. A moderate significant relationship existed between the total length of the fry and number of black spots (r2 = 0.15). The black spots were randomly distributed on the body of fry. The ventral side of the fry (Section-I); was having a significantly higher number of the black spots than the dorsal side (Section II) (?2 = 3.75; P = 0.05). No skeletal deformation was observed in the infected fry. The black spot disease in L. rohita fry, its relationship to pond management and control is discussed
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