You have to merge three or more fish to get more points. In this HTML5 game, by tapping on the side fish they will enter the puzzle board. You should set them in a correct order and let them merge and become a different color fish.
by tapping on the side fish they will enter the puzzle board and you can merge them and get score.
This video is the solution for Merge Fish game. Here you will find the answer for each level of the first Merge Fish game.