In the aquaculture feed industry, green and brown seaweeds have been used interchangeably
in small amounts as binders and growth promoters and for their nutraceutical
effect, because they can strengthen the immune system against stress. Differences have
been found in the benefits of different green and brown seaweeds (Cruz-Sua´rez et al. 2000;
Selvin et al. 2011). Their positive influence on immune systems is important because they
can be used as an alternative to the indiscriminate use of antibiotics that may increase the
resistance of pathogens. The use of antibiotics raises costs and is restricted by law