How long do Crawfish live for??

crays depending on species will live up 2 about 2 years in captivity.

size also depends on species.

heres a few site you may want to try. http://www.crayfishworld.com/sexy.htm
http://forum.nanfa.org/index.php?showtopic=3241

my female was carrying eggs on christmas day, all hatched after 36 days well the eggs that were left, about 50 lil ronnies lol......all sold bar 10. keeping back to growout and pair.

4 months on and shes carring about 300-400eggs this time. her second time and mine so to speak so am not going to desturb her this time.

west1 said:

Also I am thinking of adding a grip of feeders so I could quarentine them before feeding to my fish. So they could probly eat a couple of feeders when realy hungry

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Just a note here to say that if you put fish in the sump that serves your display tank, you're not really quarantining the fish. If they have a water-transmissable disease or parasite (like ich), it will infect the display tank as well.

Quads live about 2years

Bigger crays (Cherax, Cambarus, Procambarus, Orconectes species) will eat feeder fish; they may do too good a job of it and clean your stock out before they make it to the main tank. Dwarf crays (Cambarellus species) are unlikely to eat fish.

Crayfish are not really suitable as sump cleaners; they do scavenge dead fish and the like, but they don't eat the general muck that collects in sumps. If you just want to keep some, and your sump is the only space available, that's cool. Just don't expect them to clean it out.

A better choice for that task is scuds (amphipods). As a bonus, occasional individuals will be sucked through the pump and shot into the tank, where your fish can chow down on them.

*EDIT* I wouldn't recommend adding salt to your sump- it will go right into your main tank. You don't have to set up a glass aquarium for QT; you can use a rubbermaid tub or plastic bucket, etc.