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It has been suggested a method of GY-model adjustment to the additional data of observations represented as abundance indices. Catch per effort values or results of inventory surveys can serve as such indices. Adjustment basic concept is a selection of those GY-models from realization sets a certain function of which runs through the set of points defined by confidence intervals of abundance index estimates. It has been shown as an example of D.eleginoides from Subarea 48.3 that GY-model adjustment to the catch per effort values should give estimates of potential yield (2500 tons), essentially differing from those obtained by a routine model usage (3500 tons).