legendary fish

I was in the sewers and caught the mutant carp. But on the same day, I made a mistake and load previous save. After loading my previous save, I noticed that the buff I used previously is still there and when I am back at the sewer and try to recatch the fish, I was only able to catch carps and...

I am playing on IOS, iPad Pro, game updated to v.1.4 and in year 6 of the game, community centre restored and added. I have caught all the fish, including the legendary fish. I understand that legendary fish can only be caught once per day. But now, if I return to the sites, at the right times...