1. The place where elephants and mussels are caught is located in Xinyue River, probably at the lower left of the lonely shadow snow mountain. The map is as follows.

2. Prepare mussel bait: hairy crab bait (hairy crab+feed wheat), as shown below;

3. Then prepare a fishing rod to catch mussels, as shown below;

4. After preparing fishing rod and hairy crab bait, go to Xinyue River, as shown below;

5. Equip the fishing rod, click the hairy crab bait, click the attack button, and immediately enter the fishing mode, as shown below;

6. After a long wait, the elephant pulled out the clam, as shown below;

7. Finally, you can see the mussels caught in the backpack, as shown below.