I have a feeling that exporting fish from French Guiana may be harder than just about any other part of South America - it would surprise me quite a bit if there aren't very strict restrictions on export there - simply because it is part of France/Europe, and thus has "higher standards" when it comes to protecting the natural habitats and fauna.
In fact, google found this:
http://www.2docstock.com/Suriname/Repor ... uiana.html
Trade Report wrote:International commerce in endangered species is covered by the law of 1986 and the amended law of 1 March 1993 and applies only to French Guiana. This decree, for all intents and purposes, forbids the capture, killing, holding, export, transit, import, sale or resale of all wild vertebrate fauna and wild flora occurring in French Guiana, including their parts and derivatives. Further, sympatric species (CITES or non-CITES) that also occur in Guyana and/or Suriname, or indeed any Guyanese species held in captivity in any other country, would not be allowed into France even with an export permit from its country of origin or re-export. Therefore, theoretically, there is no legal wildlife export trade of any kind from French Guiana (with a few exceptions for preserved Arachnids and Morpho butterflies exported in small quantities for personal use). There is no legal internal pet trade of any kind either
(1982 regulations and 1983 amendments.)
So, it appears that you will need to have permission from the French government to export fish (or other vertebrate) animals from French Guiana.
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Mats