Pests and diseases can cause damage to the seaweed, this is because the pest seaweed is seaweed grazer so consumed by pests that exist in the location of cultivation. There is also a pest seaweed that are attached to the thallus kelp, this causes seaweed thallus can not receive nutrients and oxygen available in the water to the optimum because the surface is covered by pest tacks.
Epiphytic nature pest is a pest that stick and take nutrients from seaweed thallus to survive, such as parasites. Umumya prey on pest seaweed kelp that will cause physical damage to the thallus, which will thallus easily chipped, broken or devour pests. Micro pests are parasitic organisms which generally have a length of less than 2 cm.
Micro pests generally live a ride on seaweed, micro pests that often attack seaweed, among others:
a) The larvae of sea urchins (Tripneustes sp.) which are planktonic, floating in the water and then attached to the plant seaweed.
b) The larvae of sea cucumbers (Holothuria sp.) were initially attach to and settle on the seaweed thallus, then grow up to be big. The larvae are grown can eat seaweed thallus directly by inserting the ends of the branches of seaweed into his mouth.
c) Lumut Ticks, blackish brown with a small size such as hair, usually attach to and penetrate tissue seaweed thallus impede the penetration of sunlight so that the seaweed thallus rot and fall off. Spread levels quickly and cause massive damage to the seaweed cultivation.
d) epiphytes, micro pests can also be epiphytic or other types of seaweed inadvertently other seaweed spores from drifting so it can attach to and settle on thallus cultivated. These epiphytes may also reduce the penetration of light received by seaweed cultivation that can indirectly affect the growth of seaweeds cultivated. Seaweed attached epiphytes, thalusnya will become flaccid, pale, emaciated and eventually destroyed.
e) set of eggs, pest and other micro found in seaweed can also be a collection of eggs other organisms embedded in seaweed cultivated or some other organisms that make seaweed as a shelter or a shelter to store food in seaweed The.
Figure 17. Hama micro seaweed (a) Sphacelaria sp. (b) Neosiphonia sp. (c) Zoocanthid and (d) collection of marine animal egg or bryozoans