Ok i'll do mine now there have been a few replies.
Electrophorus electricus ;
Electric eel . I love these and with a couple in a large tank and the right equipment you could possibly use them to charge batteries from the small electrical impluses they constantly give off as a navigation device. Interesting and functional.
Mudskippers . I had these in mind for the same reasons as Nmonks, and if nothing else they would provide you with exercise chasing the little buggers about when they escape, probably much needed when you are stuck on a boring desert island with nothing else to do.
Gymnothorax tile ;
FW moray eel . It saddens me that so many of these get sold in shops and yet there is virtually nothing known about them or their care. With 20 years to keep and study them i could hopefully learn something about their breeding cycle and social behaviour.
Allenbatrachus grunniens ;
Toadfish . If you kept a few in a tank you could get a little chorus going when they start singing to each other at night, what better way to pass 20 years than to listen to some lovely music, well maybe not but at least it would be better than nothing. Also they have faces like little hairy old men so you wouldnt feel too stupid talking to them once the madness sets in, and toadfish fry must look really funny.
Malapterus electricus ;
Electric catfish . A great pet fish and could help the electric eels to generate some power, i might even get enough to get a PC running for a few minutes so i could check the forum once a month.
Potamotryon menchacai ;
Tiger stingray . I could never afford these in real life and would be terrified to keep them if i could but since this is make belief i can dream, besides if youre not going to be earning for 20 years then breeding these and having a couple of dozen to sell when you come back will get your bank balance back on the right track.
Asterophysus batrachus ;
Gulper catfish . I just want one, no other reason. Mrs CFC is cruel and mean and wont allow me to spend £300 on one fish while there is a mortgage to pay, but shes not allowed on my island so
Arowana; No scientific name because i'm not bothered which one i have, i just couldnt imagine not having one in a tank somewhere, maybe a few gold X backs to get breeding and have a nice little nest egg to come off the island with along with the tiger rays.
Polynemus species;
Paradise threadfins . You have to have seen and kept these to understand, like a class A drug in a fish tank.
Lepidosiren paradoxa ;
South American lungfish . I've wanted one of these for ages and after the fuss i made recently and finally managed to get one if i didnt take it mrs CFC would probably come over and stick it up my
besides they are very cool and are quite comical in the way they swim and eat, better than TV.
