Now, your text is perfect! In spite of it, consider it doesn't sound idiomatic (just like a child written story).
You need "los" before "peces" because "los peces" are the subject of the sentence:
Los peces (Suj) no le (OI) gustan (V) a Mac el oso (OI).
By definition, almost "all" of nouns working as a subject require articles (there are exceptions). I would have used "acaparar" or "adueñarse":
Eos significa que Mac puede acaparar/adueñarse de todas las nueces y (las) bayas.
A pleasure.
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