Is the amount of detail my department has to go through in its timetracking considered unfair according to labor laws, given that other departments are not required to do this? No. Labor laws do not give a damn what is fair. They care only what is legal. This is. What department you work for is not a protected category under the law; it is therefore quite legal to treat one department differently from another.

If I am meeting all my job responsibilites, but still getting questioned and sometimes chastized weekly if my times on activites are over the "averages", can this be construed as harassment? No.

My job is to keep fish alive, disease free, and keep the life-support in the faciltiy operational. Rarely if ever are we questioned about this performance, and whether we did enough to keep an animal healthy or well-fed; we are instead on questioned about our time spent doing an activity. Is this normal? What is "normal"? Different industries and different jobs have different requirements. It doesn't matter if yours is the only department at any employer anywhere in the world that is questioned about your time at various activities (and I assure you it is not). If there is no law prohibiting it, and there isn't, that's all that matters.

Is it in violation of any employment laws? No.