Tashirojima (田代島?) is a small island in Ishinomaki, Miyagi, Japan. It lies in the Pacific Ocean off the Oshika Peninsula, to the west of Ajishima. It is an inhabited island, although the population is quite small (around 100 people, compared to around 1000 people in the 1950s). It has become known as “Cat Island” due to the large stray cat population that thrives as a result of the local belief that feeding cats will bring wealth and good fortune. The cat population is now larger than the human population on the island. There are no pet dogs on the island due to the large cat population.
The island is divided into two villages/ports: Oodomari and Nitoda. Ajishima, a neighbouring island, used to belong to the town of Oshika, while Tashirojima was a part of the city of Ishinomaki. On April 1, 2005, Oshika merged with Ishinomaki, so now both islands are a part of Ishinomaki.
Source : wikipedia