Illyria said:
They don't live very long, 2-3 years and occasionally 4. After mating though males die, when they are around 2 years of age. Females die after hatching their young , which is about the same time for males, 2 years.
lol... not true. another myth like "the mommy bird wont come back if you touch the baby" type of thing.
i have a blue cray. THEY ARE NOT LOBSTERS. also, not all species are native to australia. mine is from florida. there are some well known species of crays from florida with the blue color morph. the procambarus alleni (mine) and the something imunis... i cant remember the genus. and another one im not for sure on, i think its the procambarus clarkii. yours is most likely one of those if you live in the united states.
the life span depends mostly on the temperature they are kept at. most crays like a temp between 55-72. anywhere above that and their metabolism will be greatly increased and give it an insanely short life span. the lower the temperature the less active they become. most can stand temps in the upper 40s but will hardly ever move. i keep my cray tank at about 70.
the color has nothing to do with their aggressiveness. the procambarus alleni is a very aggressive species of cray, but the imunis is very mellow, and not one to initiate an attack. im not sure on the clarkii, but its not as aggressive as the alleni.
i hope i didnt write to much. if you have any more questions feel free to ask.
EDIT: forgot to mention, your fish in there are tropical and crays are cold water. you will probably need a separate tank if you want both to thrive. strive to thrive not survive!!! w00+