Answer: Supply decreases
Explanation:
Supply is the amount of products a manufacturer is willing to sell at a particular price at a given period. If the suppliers of fishes or fishermen believe that they can generate more income selling fruit smoothies and change their jobs, this will have a negative effect on the supply of fish. There is a direct relationship between the producers and the number of fishes supplied.
More producers will lead to more fishes and less producers will lead to less fishes supplied. Since some fishermen have changed jobs, this implies that there is a reduction in producers which will also lead to reduction in supply.