{There were together} ((8873)an homou). These seven (Peter,
Thomas, Nathanael, the sons of Zebedee, and two others). We know
that the sons of Zebedee were James and John ( Mt 4:21 ),
mentioned by name nowhere in John's Gospel, apparently because
John is the author. We do not know who the "two others of his
disciples" were, possibly Andrew and Philip. It seems to me to be
crass criticism in spite of Harnack and Bernard to identify the
incident here with that in  Lu 5:1-11 . There are a few points of
similarity, but the differences are too great for such
identification even with a hypothetical common source.