Abstract
The renin angiotensin system (RAS) has been extensively studied in mammals and has been the model for comparative studies in fish. All the components of the RAS have been described in teleost fish, although their complete biological actions are not yet fully understood. Recently Olson (1992) produced a comprehensive paper reviewing cardiovascular effects of the RAS in fish in relation to extracellular volume regulation. Therefore, this chapter will focus on the role of the RAS in control of drinking in teleosts in the context of osmoregulation. Topics reviewed herein include drinking in larvae and adults in freshwater, euryhaline and marine fish.
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