Sains Malaysiana 40(10)(2011): 1049–1052

Histopathology of Marine and Freshwater Fish Lymphocystis

Disease Virus (LCDV)

(Histopatologi Virus Penyakit Limfosistis (LCDV) pada Ikan Marin dan Ikan Air Tawar)

Mosharrof Hossain*

Department of Zoology, University of Rajshahi, Rajshahi-6205, Bangladesh

Myung-Joo Oh

Division of Food Science and Aqualife Medicine, Chonnam National University

Chonnam-550-749, Korea

Received: 7 September 2010/Accepted: 31 January 2011

ABSTRACT

Lymphocystis disease (LCD) in fishes is caused by the agent called lymphocystis disease virus (LCDV). LCDV is a chronic and benign virus. The disease affects 96 species of marine and fresh water fishes ranged among 34 families in the world. Affected fish with LCD has a typical external symptom with clusters consisted of enormously hypertrophied dermal cells on the skin and fins. The hypertrophied cells, generally named lymphocystis cells, have a thick hyaline capsule, an enlarged nucleus and prominent basophilic cytoplasmic inclusions. Among the four species of fishes, olive flounder Paralichthys olivaceus, and rockfish Sebastes schlegeli were marine cultured fish, and gouramiTrichogaster leeri and painted glassfish Channa baculis were freshwater ornamental fish. Although LCD causes low mortality, the disfigurement of infected fish can make them unsellable. Thus LCD has resulted in an important economic loss in the aquaculture industry. This study of histopathology may be adequate for a presumptive diagnosis of lymphocystis diseases both in marine and freshwater fish species.

Keywords: Fish; histopathology; LCDV; lymphocystis disease; virus

ABSTRAK

Penyakit limfosistis (LCD) pada ikan disebabkan oleh satu agen yang disebut virus penyakit limfosistis (LDCV). LCDV merupakan satu virus kronik dan kurang bahaya. Penyakit ini memberi kesan kepada 96 spesies ikan marin dan ikan air tawar di dunia yang tergolong dalam 34 famili. Ikan yang terjangkit LCD mempunyai simptom luaran yang tipikal dengan kelompok sel dermis hipertrofi pada kulit dan sirip. Sel hipertrofi juga dikenali sebagai sel limfosistis yang mempunyai kapsul hialin tebal, nukleus yang besar dan sitoplasma basofilik. Antara empat spesies ikan kajian, Paralichthys olivaceus dan Sebastes schlegeli adalah ikan marin kultur manakalaTrichogaster leeri dan Channa baculis adalah ikan air tawar hiasan. Walaupun LCD membawa kepada mortaliti yang rendah, tetapi ikan terjangkit mempunyai bentuk cacat yang menyebabkan ia tidak dapat dijual. Oleh itu, LCD telah membawa kerugian ekonomi dalam industri akua-kultur. Kajian histopatologi ini mungkin sudah cukup untuk diagnosis presumptif ke atas penyakit limfosistis pada kedua-dua ikan marin dan air tawar.

Kata kunci: Histopalogi, ikan LCDV; limposistis; virus

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*Corresponding author; email: mshzool@yahoo.com