Massive mortality associated with Streptococcus agalactiae Infection in Cage-cultured Red Hybrid Tilapia Oreochromis niloticus in Como River, Kenyir Lake, Malaysia

Najiah, M. and Aqilah, N.I. and Lee, K.L. and Khairulbariyyah, Z. and Mithun, S. and Khan Chowdhury, Ahmed Jalal and Shaharom-Harrison, F. and Nadirah, M. (2012) Massive mortality associated with Streptococcus agalactiae Infection in Cage-cultured Red Hybrid Tilapia Oreochromis niloticus in Como River, Kenyir Lake, Malaysia. Journal of Biological Sciences, 12 (8). pp. 438-442. ISSN 17273048 (P), 1812-5719 (O)

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Abstract

Massive mortality of cage-cultured red hybrid tilapia Oreochromis niloticus in Como River, Kenyir Lake, Malaysia was investigated. Moribund fish showing erratic swimming, sluggishness and hemorrhagic eyes were collected for the study. Water quality parameters were measured on-site. The highest temperature was 32.70°C at the surface while lower temperature was 30.85°C at 6 m. Dissolved Oxygen (DO) was highest 7.05 mg L-1 at 4 m while lowest 6.15 mg L-1 at 10 m. The pH value was highest 8.28 at 6 m and lowest 7.52 at surface. The result has shown that un-ionized ammonia levels ranged from 0.00046-0.01 ppm within the optimum range. While Nitrite (0.003 ppm) and Nitrate values (0.1-0.7 ppm). The water quality parameters were showed their values within the accepted range of water quality for aquaculture. Bacteria were isolated from diseased fish using blood and nutrient agars, and identified using BBL Crystal™ Enteric/Non-fermenter ID and Gram Positive ID Systems and subjected to antibiotic susceptibility analysis. Results showed the presence of Streptococcus agalactiae, Burkholderia cepacia in the fish liver and Staphylococcus aureus in the fish eyes, suggesting a possible case of warm-water streptococcosis associated with S. agalactiae with multiple bacterial complications. Nevertheless, a continuous long term monitoring is essential for the sustainable development of cage aquaculture in Como river of Lake Kenyir Malaysia.

Item Type:	Article (Journal)
Additional Information:	3575/29174
Uncontrolled Keywords:	red hybrid talapia, Como river, lake Kenyir, water quality, Streptococcus agalactiae
Subjects:	Q Science > Q Science (General) S Agriculture > SH Aquaculture. Fisheries. Angling
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science > Department of Marine Science
Depositing User:	Nur' Aini Abu Bakar
Date Deposited:	21 Feb 2013 15:36
Last Modified:	06 Dec 2017 13:23
URI:	http://irep.iium.edu.my/id/eprint/29174

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