Veterinary composition of marine algae and Andrographis sp extracts, which can be used to treat infections in fish

An immunostimulant composition administered to fish comprising:

• an extract of Andrographis sp containing andrographolide and a seaweed extract containing fucoidan, wherein the ratio of andrographolide:fucoidan is in the ratio of 100:450;
• wherein the seaweed extract comprises an aqueous extract of brown algae, wherein the brown algae is selected from the group consisting of Fucus vesiculosus, Fucus evanescens, Fucus distichus, Fucus serratus, Pelvetia wrightii, Ascophyllum nodosum, Himanthalia Lorea, Bifurcaria bifurcata, Sargassum stenophyllum, Hizikia fusiforme, Durvillaea antarctica, Lessonia nigrescens, Lessonia trabeculata, Lessonia vadosa, Macrocystis pyrifera, Undaria pinnatifida, Padina pavonica, Laminarfa angustata, Laminaria japonica, Ecklonia kurome, Adenocystis utricularis, Dictyota menstrualis, Spatoglossum schroederi and Chordaria;
• and
• wherein the brown algae belongs to either (1) a fucal order of algae, each member of the fucal order of algae comprising one or more binding fucose units having glycosidic bonds of type (1-3) or (1-4) and sulfated groups located at positions C-2, C-3, or C-4, or (2) a Laminare order of algae, each member of the Laminare order of algae comprising one or more binding fucose units having glycosidic bonds of type (1-2) or (1-3) and sulfated groups located at positions C-2 or C-4.