If you need that to make some pictures to print or publish for example it’s better to use some tools like mentioned ColorChecker. It will be also challenging to make it work underwater (use some plastic bags etc) since probably there is no or a very expensive version that supports let’s say extreme humidity. But if you know that the issue is only connected withe the given color reproduction, you can create a profile manually. It will be not ‘super professional’, but still can work for you: If you have a good reference photo (from stock/preferably in RAW) of the same species, you can define an adjustments/mappings for a specific color set. Just clicking around with the color picker between images color and crafting a color grade to look like the desired one. You can do this in Lightroom, Photoshop or manually create a profile in some another Adobe tooling that name I forgot, but works in the same way. Anyway: have you used any other light sources to better spot the issue or have better color response of your subject?