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  • Water thermocline confirms susceptibility of tilapia cultured in lakes to Streptococcus agalactiae.

    Author(s) : Amal, M. N. A.Zamri-Saad, M.Zulkafli, A. R.Siti-Zahrah, A.Misri, S.Ramley, B.Shahidan, H.Sabri, M. Y.

    Author Affiliation : Department of Veterinary Pathology and Microbiology, Faculty of Veterinary Medicine, University Putra Malaysia, Serdang 43-400, Selangor, Malaysia.

    Journal article : Journal of Animal and Veterinary Advances 2010 Vol.9 No.22 pp.2811-2817 ref.20

    Abstract : A study was conducted on water qualitywater qualitySubject Category: Properties
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    profiling to confirm susceptibilitysusceptibilitySubject Category: Properties
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    of tilapiatilapiaSubject Category: Organism Names
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    cultured in lakeslakesSubject Category: Topographic Features
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    lakesSubject Category: Habitats
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    to Streptococcus agalactiaestreptococcus agalactiaeSubject Category: Organism Names
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    infection. A total of 1,010 and 719 tilapias of different sizes were collected from two lakes; the Kenyir and Pedu lakes, respectively. They were randomly sampled for a period of 24 months. Swabs of brainbrainSubject Category: Anatomical and Morphological Structures
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    , eye and kidney were streaked directly onto blood agar before S. agalactiae was identified by the API 20 STREP kit, Slidex Strepto-kit and PCR technique. The water temperaturewater temperatureSubject Category: Properties
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    (thermocline) and dissolved oxygen profiling were determined at 1 m intervals for up to 20 m deep. Water clarity and flow rate were also recorded using Secchi disk and a current meter. S. agalactiae was successfully isolated from both lakes throughout the year, ranging between 2 and 78%. Isolation was more frequent during the hot and dry months of both years. During this period, the mean water temperature was >29°C for up to 8 m deep due to the significantly (p<0.05) clearer water and slow rate of water flow that allowed deeper light penetrationpenetrationSubject Category: Properties
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    and enhanced heat retentionretentionSubject Category: Properties
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    . Water thermocline that showed a drop in water temperature was observed only in Kenyir lake at >12 m deep. This and the slow water flow kept the water temperature at 4 m deep where tilapias under the cage culture system were kept to remain high causing stress to tilapia and increases susceptibility to S. agalactiae. Dissolved oxygen profiling, however remained high at >5 mg L-1 for up to 8 m deep and did not give adverse effectsadverse effectsSubject Category: Properties
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    to susceptibility of tilapia to S. agalactiae.

    ISSN : 1680-5593

    DOI : 10.3923/javaa.2010.2811.2817

    Record Number : 20103374348

    Publisher : Medwell Online

    Location of publication : Faisalabad

    Country of publication : Pakistan

    Language of text : English

    Indexing terms for this abstract:

    Organism descriptor(s) : fishesfishesSubject Category: Organism Names
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    , StreptococcusstreptococcusSubject Category: Organism Names
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    , Streptococcus agalactiaestreptococcus agalactiaeSubject Category: Organism Names
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    , TilapiatilapiaSubject Category: Organism Names
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    Descriptor(s) : adverse effectsadverse effectsSubject Category: Properties
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    , aquacultureaquacultureSubject Category: Disciplines, Occupations and Industries
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    , aquatic animalsaquatic animalsSubject Category: Organism Groups
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    , aquatic organismsaquatic organismsSubject Category: Organism Groups
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    , brainbrainSubject Category: Anatomical and Morphological Structures
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    , cagescagesSubject Category: Techniques, Methodologies and Equipment
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    , effectseffectsSubject Category: Properties
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    , eyeseyesSubject Category: Anatomical and Morphological Structures
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    , lakeslakesSubject Category: Habitats
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    , penetrationpenetrationSubject Category: Properties
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    , retentionretentionSubject Category: Properties
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    , susceptibilitysusceptibilitySubject Category: Properties
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    , temperaturetemperatureSubject Category: Properties
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    , water qualitywater qualitySubject Category: Properties
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    , water temperaturewater temperatureSubject Category: Properties
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    Identifier(s) : adverse reactions, aquatic species, bacterium, cerebrum, water composition and quality

    Broader term(s) : vertebratesvertebratesSubject Category: Organism Names
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    , ChordatachordataSubject Category: Organism Names
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    , animalsanimalsSubject Category: Organism Names
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    , eukaryoteseukaryotesSubject Category: Organism Names
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    , StreptococcaceaestreptococcaceaeSubject Category: Organism Names
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    , LactobacillaleslactobacillalesSubject Category: Organism Names
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    , BacillibacilliSubject Category: Organism Names
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    , FirmicutesfirmicutesSubject Category: Organism Names
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    , BacteriabacteriaSubject Category: Organism Names
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    , prokaryotesprokaryotesSubject Category: Organism Names
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    , StreptococcusstreptococcusSubject Category: Organism Names
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    , CichlidaecichlidaeSubject Category: Organism Names
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    , PerciformesperciformesSubject Category: Organism Names
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    , OsteichthyesosteichthyesSubject Category: Organism Names
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    , fishesfishesSubject Category: Organism Names
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