Can. 1251 Abstinence from meat, or from some other food as determined by the Episcopal Conference, is to be observed on all Fridays,** unless a solemnity should fall on a Friday. **Abstinence and fasting are to be observed on Ash Wednesday and Good Friday.
All the days of the Octave of Easter are considered a solemnity. Therefore the Friday of the Octave of Easter would not be a day of necessary abstinence.
In the USA, outside of the Lenten season, Catholics are permitted to choose another form of penance other than abstinence on Fridays.
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