Ponderal production ofTubifex tubifexMüller andLimnodrilus hoffmeisteriClaparède (Oligochaeta, Tubificidae), benthic cohabitants of an artificial lake

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Abstract
An attempt was made to estimate the main demographic parameters in two populations of the tubificids T. tubifex and L. hoffmeisteri. The eggs and worms were counted and the individual weights measured in adequate sub-samples. It was possible to subdivide each population into four groups: eggs and embryos (E), young (G1), young and regressed adults (G2), adults (A), so allowing the adoption of a four compartments model. The annual production of the two species was tentatively estimated.