Here's some current data from active vivo pools:
Pool Workers Blocks in 24h
gos.cx 150 1 hour ago
zpool.ca 107 51 minutes ago
ahashpool.com 77 1 hour ago
zergpool.com 66 1 hour ago
phi-phi-pool.com 45 51 minutes ago
starpool.biz 23 1 hour ago
Hope that helps!
Be careful if you decide to mine VIVO at some of the larger pools.
For example on zpool.ca the only guaranteed currency is BTC
So check out the conditions, usually given on the homepage first. Happy mining!