(Bloomberg) -- The Cuba-linked closed-end mutual fund that's going bananas in the wake of Fidel Castro's death is a product investors had grown increasingly sour on over the past six months.

The Herzfeld Caribbean Basin Fund (CUBA) was up as much as 17% on Monday morning, its best one-day showing since December 2014, amid hopes that the dictator's passing will herald profit-making opportunities for a number of firms that operate there, mostly in the businesses of tourism and infrastructure development.

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