text: There are certain fish that live in harsh conditions in underwater lakes and pools in caves. I saw the program "planet earth" on the bbc, it had some cave dwelling fish and an unusual blind salamander creature.\n\nsee\nhttp://www.britannica.com/search@?query=cave&submit=Find&source=MWTEXT\n\nand\n\nhttp://www.otleyaquaristsociety.co.uk/Blind%20as%20a%20Cave%20Fish.htm\n\nUnderwater fish tend to be blind, as there is no advantage in having eyes in a cave.