Abstract
This chapter discusses the role of the adrenocortical secretions in the physiology of fishes. In studying the endocrinology of fishes, it is examined that aquatic environment does not exhibit the extreme vagaries encountered in the terrestrial existence. The first attempts to isolate adrenocortical secretions from the blood of fish were performed by Phillips and Chester Jones and Bondy. The principal hormones identified in teleost plasma were cortisol, cortisone, and corticosterone. The chapter presents a table showing a summary of the data in the literature on the level of adrenocorticosteroids in fish blood. Metabolic and endocrine mechanisms to accommodate engorgement in the cases of fishes and the slow planktonic continuous feeding of others, and even the periodic cessation of feeding in others have also been discussed in the chapter.
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