I thought about this after thinking why Oda introduced a pirate myth which was cursed and how it is actually possible that mermaids get human legs with 30.
So when Vander Decken is the 9th generation, so we may can say that Vander Decken the first got that curse for ca. 200-250years (saying that a next generation was born every +- 30 yrs).
So what exactly have we for that time period already mentioned in previous chapter.?
When you use Gregs awesome site you can find this in the timeline of OP about 200 years ago: ([http://www.thegrandline.com/frames.html](http://www.thegrandline.com/frames.html)) Quote: The World Government extends its hand in friendship to Fishmen and Mermen-kind after previously classifying them as ‘fish’. May be a coincident but it could also be that this event is somehow connected to Vander Decken
s curse.
It could be that he actually wanted to help the fishman\merman but was cursed by them because they misunderstood something did go wrong.
That love to the fishman\mermaid race can be seen still today, because his descendant seems to have a interest (well it`s more than obvious,lol) to the mermaid princess.
And now after a while thinking about it, i came up with a theorie.(well the above is already speculation)
Maybe the curse was to make Vander Decken a fishman\merman and so to force him to live a life under the sea, while the people in FI was convinced that this guy was responsible for something bad they expierenced.
I would say it was maybe a relationship to a mermaid as he still was a human and thats why he was cursed.
On the opposite side the mermaid was cursed to get "more human" by splitting their tail with 30.
This wasn`t rly a curse afterall for the mermaid, which is why they are still today proud of that effect.
It may be that they both wished it from someone but for Vander Decken it went wrong.
Also this relationship could have been the reason why the WG eased the law how fishman\merman have to be seen as "fish" etc….
What do you guys\girls think about it =?