Zonal variability and seasonal changes of the content of glycogen and glucose in the Mytilus mantle

Abstract

Glycogen and free-glucose content in the ventral, central and dorsal parts, as well as glucose-06-phosphate phosphatase activity in mantle of Mytilus galloprovincialis Lmk.were examined.The glycogen content of mantle did not manifest asymmetrical distribution among the three parts.In the period studied, the typical glycogen content profile variation was found, being maximum in July.The tissue free-glucose content was similar in each part, and the obtained seasonal variation profile was opposite to the glycogen content, reaching the minimum in July.For every part of mantle, free-glucose/glycogen ratio showed similar monthly profiles.In each part the 50% point was found in July.Glucose-06-phosphate phosphatase activity was not found in the mantle tissue.