Killoch IN Tasmania 1860

Andrew Killoch (also Killick, Kellick, Kilock) was born in 1835 (most likely in Scotland) but lived in Hobart, Tasmania around 1860-1863. His wife was Susannah Zellisine (also Zellar, Keller, Siller) was born about 1830 ( probably in Germany).
In late 1863 or early 1864 they arrived they arrived in Otago, New Zealand with two children, Andrew and Susannah and in March 1864 Susannah Snr gave birth to William Reid my great grandfather. Soon after they arrived in NZ the parents have disappeared from records (to my knowledge) but the 3 children turn up in the Taranaki/Wanganui area of the North Island of New Zealand around 1870.
We are searching for traces of Andrew Snr and his wife Susannah prior to arriving in Tasmania and then after leaving Otago NZ, probably in the late 1860's or early 1870's