Dr. Ciaran Kelly:

Regarding those changes to the physical environment, fish do not eat temperature and so they do not affect them in that way. However, they affect the environment within which fish live. Therefore, it affects their reproductive potential if there is a mismatch in timings of conditions for spawning. It can affect their growth potential if it affects their predator or prey availability. It can also affect their reproductive potential in terms of stressors on the environment like heat waves and other things. All those are second-order effects and it is not very straightforward to deduce one from the other. However, we may possibly be seeing the impact of that now and the Marine Institute is looking into this.