Abstract
My interest in longevity in fish arose originally from its significance in fish resource dynamics and its relationships to growth, maturation and fecundity. My first opportunity to perceive the wider implications of the phenomenon of longevity came at the 1959 Conference on Lifespan in Man and Animals sponsored by the CIBA Foundation. Holt and I (Beverton and Holt, 1959) gave a paper on life-spans of fish in relation to growth, and the contributors included the late George Sacher whose paper on mammalian size and life-span has been referred to at this conference. The present symposium in its aims and multi-disciplinary character has much in common with the 1959 CIBA Conference. I shall again approach my subject primarily from the demographic standpoint, but this time exploring certain evolutionary implications.
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