Murky vs Kerrigan
Murky can not do anything to Kerrigan with or without Fish Tank. Her auto attacks are hard hitting plus she has low cooldowns on her ability damage. Backing off wich works for most heroes will not work with Kerrigan because she can just jump on you. If that were not enough she also gets shields so Murky can not even get her low on health.
Switch lanes and deal with Kerrigan in team fights.