It's not the fish poop they are worried about, it's the human poop
.. plus bacteria and diseases and nasty biological stuff people bring in that cant be easily filtered.
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Hobie PA 14 ¸.·´¯`·.´¯`·.¸¸.·´¯`·.¸><(((º>
Jackson Kraken ¸.·´¯`·.¸.·´¯`·.´¯`·.¸¸.·´¯`·.¸><(((º>
Malibu X-Factor ¸.·´¯`·.´¯`·.¸¸.·´¯`·.¸><(((º>
Malibu Stealth-12 ¸.·´¯`·.´¯`·.¸¸.·´¯`·.¸><(((º>
Its not a spelling B its a fishing B 
~yakjoe