Effects of Different Concentrations of Phosphorous on the Growth of the Cyanobacteria Jaaginema sp. and its Toxic Effects on Aquatic Organisms

Subject Areas : Journal of Large Animal Clinical Science Research(JLACSR)

Received: 2021-07-06 Accepted : 2021-07-06 Published : 2008-12-21

Keywords: growth rate, phosphorous, Algal bloom, Cyanobacteria, toxin, Jaaginema sp,

Abstract :

Consuming toxins produced by algal species in running waters andfreshwater bodies can have deleterious effects on fish and other aquaticorganisms. These toxins are produced by harmful algal blooms (HAB) ofcyanobacteria in water. These blooms can be caused by several factorsincluding light, temperature, carbon dioxide, phosphorous and nitrogen.The effects of different concentrations of phosphorous on stimulatingand inhibiting growth in cyanobacterial species Jaaginema sp. was studied inthis paper. Pure cultures of Jaaginemasp. were cultured in two culture media(Z8 and BG11) using two different concentrations of phosphorous. Fourreplicates were run for each experimental group and one control group withnormal concentration of phosphorous was also studied. Water temperaturewas 25 ± 1 °C and light intensity was 2200 lux. Observations were madeonce every 48 h. This species appeared yellow in the BG11 medium andgreen in the Z8 medium. Counting were made using a hemocytometer andthe microscopic observations were made under a light microscope.Results obtained were analyzed using computer based software likeSPSS and Excel. Growth rates in the cyanobacterium species weresignificantly higher in the treatment with phosphorous concentrations of twotimes the original concentration. Higher concentrations of phosphorousresulted in inhibiting growth in this species. It is evident from the resultsobtained that phosphorous can be considered a growth inhibiting factor forcyanobacteria and thus influence the occurrence of blooms and release oftoxins into water bodies.

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