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Journal of Experimental Biology 28,173-180 (1951)
Published by Company of Biologists 1951

The Variation in Fat and Glycogen Content of the Bot Fly (Gastrophilus Intestinalis) Larva Tracheal Organ during Development

L. LEVENBOOK ¹

¹ Molteno Institute, University of Cambridge

1. In the tracheal organ cells of Gastrophilus fat and a material shown to be glycogen are accumulated as food reserves; the amounts of these substances in the tracheal organ have been followed quantitatively during development.

2. The glycogen content of the tracheal cells is low during the 2nd and early 3rd instars, gradually increases to a maximum of over 40% of the tissue dry weight during the middle of the 3rd instar, and then progressively declines.

3. Fat is accumulated in the tracheal cells throughout development, and attains a maximum of over 35% of the tissue dry weight at about the 7th-10th day of pupation.

4. At the beginning of the 3rd instar phospholipid accounts for almost the whole of the total fat; at the end of the instar it forms < 10% of the total fat.

5. In the tracheal organ of fasting Gastrophilus larvae, glycogen is probably converted into fat.