The recent death of a 46-year-old beluga in Vancouver has again highlighted the need of other belugas and whales to be freed. Though, the captivation of these organisms proves to be largely helpful for researchers to gather information about these, says a recent report.

In fact, researchers at the Canadian Federation of Humane Societies who are into a study of these belugas are themselves claiming that it is unsafe to captivate them. They are strictly criticizing the decision of raising whales' population in the aquarium, where the beluga lived.

Kavna has stayed at the Vancouver Aquarium for a period of almost 36 years and almost 30 million people before her painful death have visited her. Since, the beluga was popular for her playful as well as smiling and lovely nature.

It is also being said that she was the oldest in the esteemed North American aquarium amongst her species. The statement is evident as wild belugas usually live for some 30 years, as per senior vice-president Clint Wright.

Concerns now include two other belugas for their lives are also in danger. Since, aquariums lack enough space to fulfill their behavioural and environmental needs. "It's only by bringing these animals, talking about them, having great interpretation and talking about the issues that we make people aware", said Mr. Wright.