Growth differences in subgroups of varying longevities in a laboratory population of the male annual cyprinodont fish, Nothobranchius guentheri (Peters).

Summary Growth was studied in the sexually mature, male annual cyprinodont fish, Nothobranchius guentheri. Beginning at 8 months of age, each fish was isolated and its weight and length followed throughout the lifespan. Short-lived fish were initially longer, and ceased growing sooner than their long-lived counterparts. When the population was divided into early-and late-maturing fish, growth kinetics between the 2 subpopulations were also different. In all the subpopulations there was a positive correlation of growth cessation and length of life. The appearance of subpopulations of differing growth histories and longevities may provide model systems for studying aspects of the aging process.

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