the reason I put the part about rats in this. If you have to pack up and move which will be one main thing to surviving in this scenario you will have a hard time moving a pond whereas a male/female pair in the pocket they go and off to the races.
No?But I remember seeing carp being raised and fattened up by simply hanging them vertical in a cool, dark place (cave, basement, etc). By keeping them moist and tossing in some corn every now and then, they will continue to grow. This was a common practice is many locations. Many families kept a chosen carp that way and everyone was involved in taking care of the "pet". When it was finally cut down and consumed, another one took its place