In Venice BEAR was dreaming of fish...
But everyday the plat du jour was poisson. 
Poisson. 
POISSON! 
Today in Paris it's Poisson D'Avril and the plat du jour is. 
CHOCOLATE FISH! 
You'll see signs all over town. 
It's the day you play a trick/blageur on your nearest and dearest. 
And secretly attach a paper fish on their back...ahem 
Plus you MUST eat FISH! 
Specially in season are ganache-filled chocolate 'sardines'. 
Sachets and baskets of them await you. 
Or marzipan fish of all ilk. 
And species. 
You can always settle for a giant chocolate fish filled with friture (even more tiny chocolate fish). 
Poisson d'Avril is the day to get fish out of your system by eating as much as possible. A good place to get your fill is La Mere de Famille. 
So get out the fish plates and glasses. 
And put on those fish shorts while you're munching away... BONJOUR POISSON D'AVRIL!