Quote:
Originally Posted by o.c.d.
If fresh water puffers can be converted to salt I don't see why a hardy species couldn't adapt to higher temp, after all we all keep animals in synthetic salt mixes and trade coral from different conditions.
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FW puffers can't be adapted to live in SW. CAN NOT BE DONE.
There are some species of puffer and many other fish families that are native to estuary areas and can adapt to different conditions. What you are thinking of as a FW puffer (Figure 8, Green Spot) is native to these estuaries. These fish have a specially adapted kidney that allows them to handle the transition and thrive.
There may be some temperate species that has the ability to adapt to tropical temperature, through some facility or another. However the vast majority of ocean species are cold blooded and as such the temperature of the environment determines their metabolic rate so it seems unlikely. You can see the issues this causes if you consider the case of the livestock that is collected off of California and provided to the trade. Things like Catalina Gobies, doesn't work well.