Harmful
Algal Bacteria (HAB)
Harmful bacteria bloom is an algal bloom that
produce toxic and give a negative impact to environement or other organisms. The example of microalgae that
cause this phenomenon is cyanobacteria, dinoflagellate, and blue green algae.
Examples
1.
Red tides
2.
Eutrophication
Causes
Algal
need sunlight for photosynthesis,
a high flowing water for more oxygen and nutrientsas their food sources.
Excessive amount of sunlight increase the amount of oxygen level in the water
and also increase the number of algae, a slow moving of water causes the algae
lack of oxygen instead releasing more carbon dioxide and lack of nutrient which
is nitrogen and phosphorus which really important for their need to keep growth
. Besides that, cause by humans also can contribute to algal blooms which is,
run-off, overuse of fertilizer , waste water from industries and many more.
Disadvantages
Disadvantages
|
·
Create the dead zone in the water
|
·
The treatment costs to treat the water is
increasing
|
·
Produce a toxin that can being harmful for
fish and humans if they drink the water which already contaminated.
|
·
Increases the mortality of fish
|
·
Mechanical damage like gills becomes clogging
and asphyxiation
|
·
Effect the aquaculture product
|
Further
study about HAB
1.
Prorocentrum
minimum (Pavillard) Schiller: A
review of a harmful algal bloom species of growing worldwide importance.
(Cynthia et. al (2004)
2.
A review
of harmful algal blooms and their apparent global increase by G.M. Hallegraeff
(1993)
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