Fizzy due to gas formation.

Cantaloupe normally should not taste Fizzy .

Cantaloupe has sugar, like fructose, glucose, sucrose,when it is ready to eat.

There are many bacteria that can gain entry from the environment in cantaloupe during preparing for eating. If it is kept for a while, the contaminated bacteria will multiply. Some are gas formers .Depending upon the species,that can be Carbon dioxide or Hydrogen.

• Gas can also form in uncut cantaloupe if the skin is broken through which bacteria gain in .

Rule of thumb: it is better not consume without being sure the nature of the contaminants