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Svobodova Z.: Seasonal Changes of Glycogen Content in the Hepatopancreas and Musculature of the Carp (Cyprinus carpio L.). Acta vet. Bmo, 47, 1978: 39-50. The seasonal changes in the mass of hepatopancreas, its absolute and relative amount of glycogen, and hepatopancreas glycogen content per 1 g body mass were investigated in 1211 carP aged 4 months (Kr -1) to two years (KI ). Mter a sharp increase of these parameters during September and October, the highest glycogen amounts were found in November and December (28. 1 ± 1.23 g; 5.58 ± 0.369 g; 19.6 ± ± 0.2 % and 13.5 ± 0.76 mg, respectively). After a considerable drop in April and May, the lowest amounts of glycogen were noted in June and July (4.30 ± ± 0.200 g; 0.19 ± 0.018 g; 4.24 ± 0.326 % and 0.96 ± 0.117 mg, respectively). The parameters under study were closely correlated with water temperature and daylight length. Glycogen content of the white skeletal musculature, measured in 456 C8rP, oscillated from 0.34 ± 0.008 % to 0.81 ± 0.041 % and was found to be rather independent on the water temperature but highly dependent upon the daylight length. Glycogen content in the red musculature near the lateral line tin 300 carP) oscillated from 1.04 ± 0.063 % to 2.71 ± 0.083 % and was found to be highly dependent upon the daylight length. Glycogen content in the heart muscle of 300 carP oscillated from1.46 ± 0.077 % to 2.56 ± 0.049 %, and showed a close correlation to water temperature but only a mild one to daylight length. Circannual variations, water temperature, daylight length, carp. Intensification of fish farming brings about new problems resulting from occurrence of dift'erent predisposition factors. Health control in fish farms thus becomes increasingly important. It consists of external indicators such as the volume value and Fulton's conditional index (Krupauer and Hamai!kova 1973), and internal indicators such as the dry matter and fat content of the fish body (Vavruika and Janei!ek senior 1973). Up to now, little attention has been paid to the fish body glycogen content which is the immediate and readily available source of energy for biological processes, and, in addition, the main source of energy in the hypoxic environment; and the only source of energy in the anoxic water environment of the fish. The aim of the present study was, therefore, to investigate the complex of changes which may occur in the C8rP farming and are likely to inftuence the body glycogen stores of the fish (Svobodova 1976). Patterns of seasonal changes in glycogen content of the hepatopancreas, white and the red skeletal musculature and in the h~ musculature of the C8rP are presented in this paper. Materials and Methods In the years 1968-1970, the seasonal cycle of changes in the hepatopancreas mass and its glycogen content was investigated in monthly intervals in C8rP aged 4 months to 2 years (Kr_l and KJ from the experimental ponds No. 70 and No. 64. The fish were reared under semi-operational