Prices of fish for aquariums in Goa has increased

Due to unknown reasons, the prices of fish in aquariums in Goa has increased considerably in May 2018
In 2017, it was possible to purchase goldfish for as less as Rs 40 a pair
There were many other fish like mollies, angel fish which were available for Rs 40, Rs 50 or Rs 60 a pair
However in May 2018, one aquarium did not have any fish which cost less than Rs 80 a pair.
In another aquarium, the goldfish were priced at Rs 100 a pair