Using an AOE suiton like water dome would encompass the clam allowing Kisame to detect it (he sees where the water is not touching and knows the clam is there.) Or Kisame can summon sharks which can detect the clam through use of
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. Joki Boy explosions are tanked. All that's left is for Kisame to drain the Mizukage of chakra. Only way Mizukage could even potentially put down Kisame is through a water bullet to the brain, and he isn't entering close range when Kisame can surround himself with a water prison as protection then quickly detect the Mizukage and absorb his chakras with Samehada until he dies.