Abstract
This chapter discusses the evolution and functions of islet hormone in fishes. It describes the functions of the islet hormones in fishes that are less obvious in higher vertebrates. All fishes have endocrine and exocrine pancreas tissue. The chapter highlights four types of pancreas: (1) a cyclostome type with total separation of specialized exocrine and endocrine tissue, (2) a primitive gnathostome type, where, within a compact pancreas, the ductlike arrangement of the endocrine tissue resembles the early stages of human islet formation, (3) a tetrapodlike type of more or less compact pancreas with typical islet, and (4) an actinopterygian type, with a tendency to develop a disseminated pancreas that is widely scattered throughout the body and with a partial separation of the endocrine and exocrine tissue.
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