Ichthyologists in the whole world raise the alarm! Some species of fish have become so rare, that in a couple of years they may disappear completely. As a result, a great number of animals and birds will suffer from the lack of food, and your mission is to save vanishing fish from extinction and prevent an ecocatastrophe. For this purpose a special expedition was organized, which aimed to collect as many species of the extinct fish as possible to raise them in the laboratory and then to set them free. Beware! There will be not only fish among your catch sometimes!