Other than your typical questions about former jobs and such, they tend to ask situational questions. They'll ask about how your former experience helps prepare you for this role. They'll ask you to describe what you would do in "worst case scenario" aquarium goes down situations. They may ask about your feelings on euthanasia because this is a good question to "feel out" a candidate. Here's a hint: there are times when it's necessary. You'll also get daily husbandry questions regarding the care of animals. You typically first get a phone interview, then if you make it to the next round, you'll get a Skype interview so they can see what you look like and see how you respond to questions via your body language. The questions here can either become more detailed regarding husbandry, or if they were detailed in the first interview, they could be more questions to get to know you. They are typically pretty good about letting you know either way about the position so you don't have to wonder.