How to Tame:
老水泡 is a rare found off the coast of Zulzadar. He has a unique pink coloring. There is nothing special to taming him. Other crabs with a similar models but different coloring are common throughout Azeroth. 卡尔金 is another very popular Crab with a similar model introduced back in Firelands. He is one of the many challenge tames introduced in patch 4.2. For more information on how to obtain Karkin, check out the Hunter Pet Secret Guide!
For more information on 老水泡, check out the Wowhead comments or Petopia!