Red, green, and brown seaweed produce large quantities of polysaccharides such as fucoidan, alginic acid, fucoidan, agar, cellulose, laminarin and carrageenan. Alginate is one of the main organic components in seaweed, and is as high as 50% in brown algal species such as wakame (Undaria pinnatifida) (Skriptsova et al. 2004). These polysaccharides have a variety of applications including antioxidants (de Souza et al. 2007), antitumor agents (Fukahori et al. 2008), anticoagulants (Li et al. 2008), anti-inflammatory agents, cosmetics, food ingredients, industrial products (Dhargalkar and Pereira 2005), and production of biofuel (Hom et al. 2000). In 2016, the global production of aquatic plants, mostly seaweeds, reached 31.2 million tonnes, 96.5 % (30.1 million tonnes) of which was harvested from aquaculture (FAO 2018). Regarding increasing seaweed products, there has been an increase in the quantities of seaweed wastes that are produced by industries (Fei et al. 1999); for example, in Japan more than 200,000 tonnes of Wakame (Undaria pinnatifida) is produced every year (Fujii and Korenage 2000). Another reasons in recent increased of seaweed waste is the eutrophication of coastal seawater resulting in a rapid increased in seaweeds growth and increased in drifting seaweeds (Tang et al., 2008). Furthermore, because most of this seaweed waste is confined in landfills or incinerated, the ability to either use or reduce the quantities of this harvested seaweed waste is receiving increased attention around the globe.
For preservation of the marine environment and recycling of organic substances, the utilization and the disposal are very important. However due to its complicated molecular structure, it is not easy for the general microorganisms to degrade the alginate contents in the seaweed. Thus it is important to find the effective way for disposal of seaweed wastes by seaweed polysaccharide like alginate degrading bacteria. The aim of this research is to isolate and characterize the seaweed degrading bacteria from marine herbivore animal gut and brown algae. In this research, isolation of the bacterium with seaweed degradability will be utilized for the future references for seaweed wastes disposal.