GR translation: sunfishing in the clouds

[Mike Jing]

P130.38-131.4   Tonight’s scratch choir was all male, epauletted
shoulders visible under the wide necks of the white robes, and many
faces nearly as white with the exhaustion of soaked and muddy fields,
midwatches, cables strummed by the nervous balloons sunfishing in the
clouds, tents whose lights inside shone nuclear at twilight, soullike,
through the crosshatched walls, turning canvas to
fine gauze, while the wind drummed there.

What is "sunfishing"?  Fishing for the sun?  Or acting like sunfish?