Can you help with a song?

OK I need your help. Put on your thinking hats! I have this photo from Lock 7 school taken about 1932. The girls are dressed as fisher-women and holding cut-out cardboard fish. (herrings) Somebody who was there could remember words to this effect: “where are you going to my pretty lass, we’re going to sea, sea. After the …. Into the sea of jewels.” I would like to find out the name of the song so I can look it up and possibly find the words and tune. (Maybe you can even identify some of the girls: the girl second from right at back is my mother Evelyn Rains.)

Lock 7 school girls as fisherwomen c 1932

Lock 7 school girls as fisherwomen c 1932