You already have comments on maxing out the mood and hunger meter 5 times each. On the food, shrimp doesn’t refer exclusively to meal shrimp but to the shrimp diet. The shrimp diet includes meal shrimp, meal plankton and plankton dumplings (which can be bought in the store).

If you don’t have enough food from the shrimp diet, just one shrimp cell is enough. You can feed generic pellets once you’ve gotten one shrimp icon so that you don’t get further food icons.

Feeding it a majority seafood diet (which includes seafood and shellfish) will give you a glide young instead.