"St. Chicken" is a quirky game for Mac and PC where you’ll play as a lost pet guppy with special healing powers. Controlling St. Chicken, players spawn, nourish and protect a school of offspring, guiding them through a series of lakes and estuaries, in search of lost, sacred aquarium relics. Players unlock levels by spawning as many baby guppies (fry) as possible. To spawn offspring, St. Chicken needs to eat nutrients from food in the water. Once St. Chicken eats enough food, a baby guppy is born. Throughout the game the player will spawn hundreds of offspring, and use St. Chicken to shepherd them through the perils of the wild- to safety. The fry are dependent on St. Chicken for nourishment and guidance.
So actually... Glowfish predates St. Chicken by about a year and does the whole "small fish following big fish" thing much better both artistically and in terms of game mechanics and gameplay. So if you liked Glowfish, don't buy this one, it's going to be a letdown.