Many of my fish portraits don't look so good because of the "red eye" effect which also affects fishes.
I am talking about relatively close-up shots, typically shot with a 60mm macro lens (APS-C DSLR), 2 strobes in manual mode, shooting scorpionfishes, pipe fishes, etc.
Here's an example i have handy, although on this particular shot it's not too bad (i wouldn't have published it otherwise ), it can get much worse:
When i started underwater photography, i was shooting with a 105mm macro in TTL, got some red eyes, but the Lightroom version i used at that time (v3?) was capable to remove the red eyes the same feature as for humans did work brilliantly.
Now on Lightroom 6 it doesn't work.
I thought about using the camera's onboard red eye reduction mode, but it actually relies on the AF assistance light, which is of no use in an undrwater housing.
So question to the crowd: how are you preventing red eyes from ruining your fish portraits?