I can find loads of news sites reporting it, but none saying its a hoax. Where did it start?
It started with a major drugbust for which the banana load was a maquerading agent. Imagine that 20,000 kgs of bananas do not last very long and D.B. itself has publicly denied the very fact that the bananas would come Blijdorp's way (apart from the very fact that in feed stuffs bananas is not recommended for many species and so very few mouths for so many bananas ... so no way).
It is rather disheartening that the press - in these circumstances - never check their facts right and just print it cause it sells well. And vice versa it lands in the international press - always a good one for hype stories and you are done with it.
Again, let me say the story is a complete hoax.