Original paper

Distinctness of the populations and bioenergetics indices of On-fish versus older age groups in temperate zone rivers

Penczak, T.

Large Rivers Vol. 12 No. 2-4 (2001), p. 475 - 483

28 references

published: Feb 12, 2001

DOI: 10.1127/lr/12/2001/475

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Abstract

Statistical analysis of population parameters (mortality and growth rate, mean biomass, production and turnover ratio) and bioenergetic indices (gross and net ecological efficiency, respiration/consumption ratio) over the lifespan of several freshwater fishes reveals a considerable divergence between 0+ and older age groups, resulting in a bimodal distribution of the values of these variables. Hence, despite high correlations between population parameters or bioenergetic indices with successive age groups starting from 0+, describing all relationships with one allometric model for a whole population is an improper procedure, because such an approach may yield poor prediction of growth and consumption during field research.

Keywords

rivers0+ fishpopulation parameterbioenergetic indices