Well, on a side note. Once I went swimming in the Dead Sea in Israel.
Awfully salty stuff. Feels like acid on your tongue.
Well I decided to...well...release some excess gasses I had. Thought nothing of it.
Until I did it. My eyes grew as big as saucers. Felt like someone got ahold of a red hot poker and stuck me where the sun don't shine.
And I SWEAR that my poop was a different color every night for at least a week.
Started off with purple if I remember correctly. So maybe the chemical composition of the water affects the fishy poo?