Jason,
I maintain my adult greens in 8 by 3 foot cages. I feel that this is of adjacent size for females up to 13 or 14 feet. Without a pool taking up floor area, this size of cage appears to be sufficient. When females approach 15 feet, the floor area of the cage will need to be increased. There are two schools of thought on the water question with green anacondas. One group follows the quite logical reasoning that there must be a water pool available that they can submerge into in order for them to do well in captivity. The other, much smaller group, feels that a pool is not necessary and they will do quite well in captivity without it. Through my years of maintaining greens, I have definitely become part of this second group. It is not a question of one way being better for the anacondas than the other, but a matter of choice and time commitment. Attentive owners have raised greens successfully with access to large pools, without any problems. On the other hand, many more snakes have suffered because these pools became fouled with feces for lack of proper maintenance. Small greens utilize small water containers that are easily cleaned in a few minutes. As greens grow, you start getting into water containers of 50 to 100 gallons and up, and then you start getting into a major cleaning commitment of time and labor to keep it as sanitary as it needs to be. It is totally a matter of choice. My view is if greens really needed access to large pools, I would go through the time and effort required. But Jud and I have found that green anacondas do very well in captivity without access to pools, even to the point that we have produced two litters of young from two different females over the last few years. Both females and the male had never had access to any water other than a large drinking bowl. Green anacondas can stress fairly easily if proper environmental conditions are not met, and I feel that if they were stressed at all by the lack of a pool, they would more than likely have never successfully reproduced. All of our breeding adults have been raised and maintained from newborns, without access to water other than a small drinking bowl, and we have not encountered health problems of any kind using this system. It is I believe, necessary to raise greens without pools from the time they are born in order to be successful in keeping them without access to these soaking pools. We do maintain a higher humidity with the young but have only done so with the adults during shedding periods. Just my thoughts on the subject.
Kelly