The reception at my conference in Genoa was held in the Aquarium, one of the largest in Europe. At that time, I realized that the most interesting photos of aquaria are actually images of the visitors, not the actual exhibits of fish, reptiles, etc. While the panorama of Genoa at sunset that I shot from the rooftop of the aquarium was impressive, I did not find many photogenic subject inside the exhibit itself.
A couple of weeks after, when we visited a much lower-profile “oceanarium” in Voronezh with my family, I shot almost exclusively my daughter enjoying the site, and the opportunities for interesting (from my, very subjective, perspective) shots were numerous.
From the technical standpoint, flash photography is usually not allowed in aquaria, so a fast lens is a must. I used my Canon EF 35mm f/1.4L USM 
