I transfer pictures from several visits to these mosaics to sub-galleries in the Zeugma gallery to put some order in them. This is one such gallery. You will see my technique and equipment (and opinion on what looks best) changes over the years, as do the displays.
This mosaic is very similar to one in the Antakya museum, so I think the subject is the same. If it is, this is Oceanous and Thetis. From Enc. Britt.: In Hesiod's Theogony, Oceanus was the son of Uranus (Heaven) and Gaea (Earth), the husband of the Titan Tethys, and father of 3,000 stream spirits and 3,000 ocean nymphs. In Homer's works he was the origin of the gods. As a common noun the word received almost the modern sense of ocean. Hence in details all sorts of "sea life" appear.
In the museum there is another, very similar mosaic.