Abstract
We conducted small-scale rearing of the endangered species Itasenpara bitterling (Acheilognathus longipinnis) to elucidate the effects of rearing conditions on growth and survival. We focused on daily frequency of feeding (once or three times), density (5 or 20 individuals), and weather conditions (sunshine or shade). We established three experimental groups of 16 each, which were combinations of these conditions. We determined survival rate and measured standard length and weight monthly throughout the experiment. In addition, we determined sexual maturation status. The results suggest that growth was suitable under abundant sunshine at a low density. On the other hand, deteriorating water quality from leftover feed and high water temperature decreased the survival rate. Fish in all experimental groups sexually matured. Consequently, rearing this species in a small aquarium was possible based on the conditions tested, and could be an effective method for conservation of this species.
