A device for the transport, introduction, and acclimation of fish. The device, a bag comprising a window of
dialysis membrane, allows fish to be transported within the bag and acclimated to new
saline environments by allowing solutes, mainly salt and
hydrogen ions, to slowly equilibrate between water within the bag and water in the source environment so as to avoid shock to the fish. Although the majority of the bag is impermeable to solutes, the
dialysis membrane window is not, and is
size dependent based on the characteristics of the fish to be acclimated. In use, the fish is placed in the bag along with
source water from the source of the
organism. The bag is then immersed in the destination aquarium, and passive
diffusion allows the slow transport of solutes across the semi-permeable
dialysis membrane, slowly equalizing the water parameters inside and outside the bag. After an appropriate amount of time has passed, the occupants of the container are removed and placed in the new environment.