Contributors. Preface. M.V. Angel, What Is the Deep-Sea? S.H. Weitzman, Systematics of Deep Sea Fishes: Introduction. A Classification of Living Fishes Occurring Near or Below about 500 to 600 M with an Annotated List of Deep Sea Fish. References. R.L. Haedrich, Distribution and Population Ecology. J.V. Gartner Jr., R.E. Crabtree, and K.J. Sulak, Feeding at Depth. B. Pelster, Buoyancy at Depth: Introduction. The Problem of Buoyancy. Swimbladder Function. Lipid Accumulation. Watery Tissues. Hydrodynamic Lift. Conclusions. References. A.G. Gibbs, Biochemistry at Depth: Introduction. Effects of Pressure on Biochemical Systems: Protein Interactions and Enzyme Kinetics. Tolerance Adaptions: Maintenance of Biochemical Function in the Deep Sea. Capacity Adaptation: Biochemical Correlates of Organismal Metabolism. Future Directions: Phylogenetic and Molecular Approaches. References. P. Sebert, Pressure Effects on Shallow Water Fish: Introduction. Fish as a Model. Methods. Effects of Short-Term Pressure Exposure. Acclimation of Fish to Hydrostatic Pressure. Comparison of Shallow Water Fish (SWF) and Deep Water Fish (DWF). Conclusion. References. J. Montgomery, Sensory Physiology: Introduction. Olfaction/Chemoreception. Vision. Touch. Octavolateralis Systems. General Comments. References. Laboratory and in Situ. K.L. Smith, Jr., and R.J. Baldwin, Methods for Studying Deep Sea Fishes: Introduction. Laboratory Studies. In Situ Studies. Future Directions. References. Index.