Bloom of a freshwater green alga <i>Botryococcus braunii</i> (Botryococcaceae, Trebouxiophyceae) and the associated mass fish mortality in a man-made lake, Sarawak, Malaysia

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  • Teng Sing Tung
    Faculty of Resource Science and Technology, Universiti Malaysia Sarawak
  • Law Ing Kuo
    Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya
  • Hanifah Afiqah Hamilton
    Faculty of Resource Science and Technology, Universiti Malaysia Sarawak
  • Bojo Othman Bin
    Faculty of Resource Science and Technology, Universiti Malaysia Sarawak
  • Idrus Farah Akmal
    Faculty of Resource Science and Technology, Universiti Malaysia Sarawak
  • Mannaf Aini Hannani Naqiah Abdul
    Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya
  • Lim Po Teen
    Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya
  • Leaw Chui Pin
    Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya

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  • Bloom of a freshwater green alga Botryococcus braunii (Botryococcaceae, Trebouxiophyceae) and the associated mass fish mortality in a man-made lake, Sarawak, Malaysia

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Description

<p>Mass mortality of fish (∼8,500 fishes), mainly Oreochromis placidus, was noted in a man-made lake located at Kuching, Sarawak (Malaysia). A field investigation was conducted to collect water samples and fishes. Patches of discoloration in brick red were observed in the lake and clear oil layer was found on the surface of the water. Microscopic observation and enumeration of the water samples showed that the plankton composition was dominated by a green algal species Botryococcus sp., with the colony densities ranging 1.2×103–7.4×106 colonies L−1. Detailed morphological assessment by light microscopy revealed the dominant species as Botryococcus braunii Kützing. Molecular characterization using an rDNA marker further supported the species identity as B. braunii in the L race. Fish gill observation showed that cells of B. braunii and the oily substances were found in the dead fish gills. The race-L B. braunii bloom was reported, for the first time, to be associated with a fish kill event in a freshwater lake in Malaysia and confirmed the species as one of the algal types causing harmful effects to the environment.</p>

Journal

  • Plankton and Benthos Research

    Plankton and Benthos Research 16 (1), 59-68, 2021-02-19

    The Plankton Society of Japan, The Japanese Association of Benthology

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