الفهرس 
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Abstract
Harmful algal Blooms (HABs) include all aquatic microscopic species that are known to produce toxins or to cause harm, directly or indirectly, to aquatic organisms or to terrestrial organisms associated with aquatic habitats or their products. Harmful microalgae can produce a suite of toxic or noxious bioactive compounds (Secondary metabolites) that can adversely affect other organisms or ecosystems (Murray et al. 2012). Dinoflagellates are one of the main components of harmful algal species; they act as prey or predator in the marine environment food web. Some potentially harmful species of dinoflagellates bloom can cause a massive fish kill. These dinoflagellates are either toxic, secreting mucous or have spines interfere with fish breathing system or they cause oxygen depletion in the water lead to the suffocation of the fish which led to economic loss (Glibert, 2007). Dinoflagellates are planktonic, benthic and also play a key role in symbiotic associations (zooxanthellae) with tropical animals and coral reefs.