If you need the review of this subject (see the attached paper)

If you need the answer of your question (see the attached links)

http://www.ncbi.nlm.nih.gov/pubmed/23682610

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-87592006000300002

http://www.aquenal.com.au/capabilities-and-services/marine-pests-and-biofouling

You can also treat the surfaces with a natural product antifoulant that will minimize biofouling without posing toxicity to your target organisms.  For instance, several researchers have looked at using zosteric acid surfaces.  

Dear Eduardo Rodolfo Rebolledo Monsalve,

What do you mean with biofouling? Growth of algae on the scallops and oysters?

Is periodic mechanical scrubbing or a high water flow to remove the biofouling an option?

Chlorine is most likely not an option.

Best regards, Hans