The whole island is essentially the temple called DingHuiSi, 定慧寺. From across banks the island does not look like a temple but it essentially encompasses the whole island. Built during the Han Dynasty, around 1500 years ago, this temple still has its original architecture, surviving the red guards during the Cultural Revolution likely due to its island inaccessibility.
I’ve seen the fish, looks like dragon fish “bong”, at many temples such as the temples in Korea. A kind monastic explained that they would strike the fish to call everyone back for mealtime. As for the coin “hudian” they would strike that to gather everyone for announcements.
Late Master Dong Chu, the teacher of late Master Shen Yen who founded of Dharma Drum Mountain, was the abbot here.
Jiaoshan Dinghuisi,Dongwu Rd, Jingkou, Zhenjiang, Jiangsu, China