From February 1988 though June 1990, 475 adult long-tailed macaques (M
acaca fascicularis) were released on Tinjil Island to establish a bree
ding program that will provide monkeys for biomedical research while c
ontributing to Indonesia's primate conservation efforts. A survey was
conducted during the summer of 1990 to assess the status of the island
's population. Basic demographic data were consistent with those from
other field studies of long-tailed macaques, and estimates of reproduc
tivity suggest a successful breeding program. The facility established
on Tinjil Island should serve as a useful model for future primate re
source and conservation programs. (C) 1993 Wiley-Liss, Inc.