9 IONOREGULATION IN TROPICAL FISHES FROM ION-POOR, ACIDIC BLACKWATERS: IX. FUTURE DIRECTIONS.

Chapter 9.9 of the book "The Physiology of Tropical Fishes," Volume 21, is presented. The chapter focuses on the areas of research concerning ionoregulatory adaptations of tropical fishes to ion-poor waters. It explores the possible potential of research on water balance, osmoregulation and physiology of fishes in laboratory conditions.