Summarize what happened to the fish in loberg lake include an explanation for why it happened.

The Stickleback fishes regrew in their assigned and adapted niche

According to sources, the most probable answer to this query is that this shows how species, for example, fishes can still evolve. And that evolution is a tangible explanation for such event, 

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Glucose, also called grape sugar, blood sugar or corn sugar, is among the simplest and one of the primary naturally occurring sugars. produced naturally by plants as the primary photosynthesis product, it is heavily used by living beings as a main energy source and is necessary for cellular respiration. chemically, it is a monosaccharide carbohydrate and serves as a building block for complex sugars like starch.