The blue 'species' tab with the small fish icon will have information about each species you've unlocked! Each species available in Splash are categorised into different sets. There are Core Sets, unlocked from the set unlocker chests around the reef with keys. Then there are event sets, obtained through limited time events! On some pages you will see silhouettes - this means you're yet to unlock that particular species!
Here you’ll see all the species you’ve unlocked . Tap on that fish for more details about that species, and how many of each you’ve released. If you have enough crafting ingredients tap ‘Create’. You can also tap on an ingredient to see a list of fish that could drop that ingredient when released!
Missing egg ingredients can be purchased using Splashcash, if you wish not to, hold tight - you’ll also find crafting ingredients in the chests you earn from releasing fish!