The influence of the clan extended even to Ezo crossing over the Tsugaru Straits, and the clan appointed Watari-to (the group of immigrants) settled in the south part of Ezogashima Islands (generally they are said to have come from the mainland, but there are different theories) as its hikan (low-level bureaucrat).
その勢力は津軽海峡を跨いで蝦夷地に及び、蠣崎氏ら蝦夷島南部の渡党（一般的には和人勢力とされているが疑問も呈されている）を被官とした。