A Study on Black Spot Disease in Catla catla and Labeo rohita Fry in Fish Seed Rearing Center, Chhattisgarh, India

B. R. Honnananda; Pabitra Barik; Mangesh M. Bhosale

doi:10.22161/ijhaf.8.2.5

Indexing and Abstracting

A Study on Black Spot Disease in Catla catla and Labeo rohita Fry in Fish Seed Rearing Center, Chhattisgarh, India

B. R. Honnananda , Pabitra Barik , Mangesh M. Bhosale

International Journal of Horticulture, Agriculture and Food science(IJHAF), Vol-8,Issue-2, April - June 2024, Pages 32-35, 10.22161/ijhaf.8.2.5

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Article Info: Received: 11 May 2024; Received in revised form: 02 Jun 2024; Accepted: 08 Jun 2024; Available online: 15 Jun 2024

Abstract:

Black spot disease, also known as posthodiplostomiasis, is caused by digenetic trematodes belonging to the family Diplostomatidae, with Posthodiplostomum cuticola being a common etiological agent. The present study was conducted at the Government Fish Seed Rearing Center, Khairbanakala, Kawardha, Chhattisgarh, where an outbreak was observed in nursery ponds rearing fry of Catla catla and Labeo rohita. Infected fry were examined for black spot incidence, metacercarial cysts, and associated pathological conditions. A total of 200 fry were analyzed from over 1000 examined individuals. The mean fry length was 20.47 mm, with an average of 4.49 ± 1.53 black spots per fry. The cysts measured 0.79–1.01 mm in diameter, with metacercaria ranging between 0.70–0.98 mm. Histological observations confirmed encysted metacercaria surrounded by melanized host tissue. The infected ponds had abundant aquatic vegetation (Hydrilla sp., Vallisneria sp.), alkaline water, and were inhabited by snails (Planorbis sp., Lymnaea sp.) and piscivorous birds, facilitating completion of the parasite’s life cycle. The study highlights the significance of pond ecology, snail abundance, and bird populations in disease transmission. Control measures such as snail population management and exclusion of piscivorous birds are recommended to reduce the incidence of black spot disease in nursery ponds.

Keywords:

Black spot disease, Posthodiplostomum cuticula, Catla catla, Labeo rohita, Chhattisgarh.

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A Study on Black Spot Disease in Catla catla and Labeo rohita Fry in Fish Seed Rearing Center, Chhattisgarh, India

Abstract:

Keywords:

References: