Pink Chromodoris grahami from Colombia

Thanks Elianny,
I don't remember saying Aplysiids don't like sewage - perhaps it was the discussion suggesting that large populations of Bursatella leachi indicated sewerage pollution. I don't really want ot get into a discussion on the subject because it is very complicated. Sewerage itself can cause problems of eutrophication, excess of nutrients leading to excess plant and bacterial growth and deoxygenation. But often with house waste it is the other chemical wastes - detergents, poisons etc which are the problem.

I must say that the leaking main sewer pipe in Dar es Salaam, Tanzania, which ran across an intertidal raised reef when I lived there, was a very good place to find nudibranchs, presumably because the added nutrients allowed a lush growth of sponges, hydroids and other colonial animals that nudibranchs like to eat, but I wouldn't consider that a good reason not to fight pollution wherever possible.
Cheers,
Bill Rudman