Mariner Gunerius Kristiansen from Fredrikstad

I am looking for information on the voyages my grandfather made from about 1887/8 onwards. I read somewhere that there are lists of cres and vessels does anyone know where can I find this information. Also Gunnerius or George worked in Russia from 1918 - 20 training Russian fishermen. He was still a Norwegian citizen at this time, can anyone suggest under whose auspices he was working.