TAILIEUCHUNG - STREPTOCOCCUS

SABRI Faculty of Veterinary Medicine, University Putra Malaysia, 43400 Serdang *National Fish Health Research Institute, Batu Maung, Penang Abstract Attempts were made to isolate Streptococcus agalactiae from cage cultured tilapia kept in different water bodies. These include the small-sized but fast flowing irrigation canal, small-sized slow flowing exmiming ponds, moderate-sized and moderate flowing rivers and huge-size slow flowing reservoirs. A total of 1164 tilapias were collected from irrigation canals, 982 from ex-mining ponds, 1967 from rivers and 1390 from reservoirs between October 2006 and March 2008. The brains, kidneys and eyes were collected for bacterial isolation, particularly Streptococcus agalactiae. S | STREPTOCOCCUS AGALACTIAE ISOLATION PATTERNS FROM CAGE CULTURED TILAPIA AMAL M. N. A. M. ZAMRI-SAAD A. SITI-ZAHRAH M. Y. SABRI Faculty of Veterinary Medicine University Putra Malaysia 43400 Serdang National Fish Health Research Institute Batu Maung Penang Abstract Attempts were made to isolate Streptococcus agalactiae from cage cultured tilapia kept in different water bodies. These include the small-sized but fast flowing irrigation canal small-sized slow flowing exmiming ponds moderate-sized and moderate flowing rivers and huge-size slow flowing reservoirs. A total of 1164 tilapias were collected from irrigation canals 982 from ex-mining ponds 1967 from rivers and 1390 from reservoirs between October 2006 and March 2008. The brains kidneys and eyes were collected for bacterial isolation particularly Streptococcus agalactiae. S. agalactiae was successfully isolated from less than 5 tilapia kept in irrigation canals and ex-mining ponds mainly in October 2006 July and September 2007. No disease outbreak was reported. Successful isolations in the range between 8 and 55 were made from tilapia kept in rivers particularly in October to December 2006 and between June and August 2007. Death rates range between 5 and 45 observed in May to October 2007. Isolations were made from 5 to 78 tilapia kept in reservoirs particularly between October and November 2006 April and August 2007 and January and March 2008 with mortality between 5 and 60 fish. Isolations were frequently made from tilapia of the size between 150 and 250 grams when the water temperature was higher than 31oC. INTRODUCTION Red tilapia Oreochromis niloticus hybrid was first introduced into Malaysia in the mid 1980 s. It was initially considered to be hardy and resistant to diseases. However mortality of tilapia in Malaysia was first observed in 1997 affecting fish weighing between 300 and 400 grams kept in floating net cages of Sungai Pahang Siti-Zahrah personal communication . The affected fishes showed corneal

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