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Thankyou.
5 comments:
Very interesting, and lovely photo of the squirrel!
Tilapia are common on Brazilian menus and I suppose I assumed they were already farmed. By all accounts they escape easily so I hope they don't get the chance!
About Tilapias and other non native fish:
I think the basic problem is that current legislation allows the cultivation of non-native fish in cages networks only in environments where the NON NATIVE species is demonstrably established, which is not the case in most environments dammed in the country, especially in the basins in the West and North portions of the Brazil.
Apart from this obvious mismatch, the major concern is about the possibility of massive releases of non-native fishes into Brazilian ecosystems. There are numerous scientific publications showing that negative impacts follow the establishment of non-native fish, including impacts caused by tilapia (a target species) in Brazilian aquatic ecosystems (e.g. Vitule 2009 and references therein), problems neglected in the law project (PL). Especially, PL neglected broad and basic aspects concerning fish invasionlike: there is no safe confinement in aquaculture, and the activity has been considered the main vector releasing non-native organisms around the world (Naylor et al., 2001). Fish escapes are inevitable, and cage aquaculture may create a constant flow of propagules into the wild , establishment, spread and invasions. Certainly, aquaculture may affect invaders dynamics, which in turn determine impacts. Finally, cages will be installed in reservoirs, environments that facilitate the invasion process (Johnson et al. 2008), so establishment, dispersion and impacts will be magnified triggering to colossal invasion events across South America, because reservoirs are in all large basins of the continent and fish do not recognize political borders.
If the real danger of species introductions is minimized
because of insufficient and unreliable data, or misguided
ecological pragmatism, carte blanche is in fact provided
to decision-makers or organizations who think only
about immediate profit that introductions can bring,
without considering longer term losses. Those losses
will be tremendous and experienced by all future
generations, especially those who live in megadiverse
tropical countries.(Lövei at al 2012).
Jean Vitule
Thank you David for your comment. De. Jean Vitule, the author of the correspondence in Nature, has kindly commented. In a nutshell, as your correctly pointed out, culture of non-native species indeed takes place in areas where such fishes are 'established ' but not in those environments that are dammed in Brazil.
Thank you for your comments Dr. Vitule. Many thanks for highlighting this issue. We will look forward to hearing more about the fate of the proposed law in due course. We wish you all the best in your research
Dear Ruth,
You are welcome!
Thank you for use our correspondence.
Thanks on behalf of my co-author.
Jean
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