Harmful Algal Bacteria (HAB)

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)