Hi scubaron,
It is estimated that there were 250,000 visitors to Belize in 2004. If each of those visitors took home 'one or two dead shells or several edible fish' I personally think that it would be quite destructive to Belizean natural resources.
...and no, I'm not vegetarian or a member of Greenpeace but I do have respect for the environment.
Take only pictures. Leave only footprints.
Hon