Tropical Fish Keeping - Aquarium fish care and resources

Tropical Fish Keeping - Aquarium fish care and resources (http://www.tropicalfishkeeping.com/)
-   Catfish (http://www.tropicalfishkeeping.com/catfish/)
-   -   Questions About Upside Down Catfish! (http://www.tropicalfishkeeping.com/catfish/questions-about-upside-down-catfish-21628/)

BORGUSX 02-24-2009 02:41 PM

Questions About Upside Down Catfish!
 
1.Does anyone know when did a regular catfish evolved or become able to swim upside-down in the first place? Since,they are one of the interesting fish that I came to know about,besides some fish that are able to live on land for an extended period of time.

2.Some of my upside down catifish seem to be pale,but I do put bottom feeders food at night,but I do admit sometimes I forget to?!

iamntbatman 03-03-2009 01:43 PM

Well, most if not all fish *can* swim upside down, it's just that most of the time they don't. My corydoras catfish will swim upside down just under the surface to eat flake food every once in a while. I imagine that over time, competition and other environmental factors made it so traits that helped upside-down catfish feed this way were favored and thus passed on. Actually many Synodontis catfish species will swim upside down from time to time; but the true upside-down catfish just does it the most.

Color changes in fish usually have to do with stress, aggression or mating, so I don't think it's the food supply. I know many nocturnal fish (like upside-down catfish) will go pale when you first turn the lights on.


All times are GMT -5. The time now is 04:09 PM.

Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0 PL2