Patent ID: 7946250

Claim:
A dual-purpose jar-aquarium comprising: a readily-portable container containing a fish and water enriched by the fish with plant-enhancing nutrients that are products of the fish's metabolism and their bacterial breakdown; and a dual-purpose cap removably secured to the container such that it remains in place while the jar-aquarium is inverted, the cap including a single topwall with an edge, the topwall having a non-apertured major topwall portion and a minor topwall portion with a plurality of apertures therethrough, including a sole unobstructed water-ingress aperture sized to accept passage of a free unbroken stream of clean water therethrough for cap-on filling of the jar-aquarium and a grouping of water-egress apertures laterally spaced from the water-ingress aperture, each water-egress aperture smaller than the water-ingress aperture to facilitate controlled cap-on out-pouring of the enriched water, whereby jar-aquarium water may be changed without removing the cap, at least one of the apertures being continuously open.