Horse-mackerel energy metabolism

E.V. Ivleva (1989a) found that, during the winter, Black Sea horse-mackerel displayed increased thyroid activity. This is directly related to the intensity of energy metabolism. Other workers found enhanced growth of the follicular cells of the thyroid gland of brown trout and brook trout during periods of low temperature (Woodhead and Woodhead, 1965a,b Drury and Eales, 1968), and increased thyroxine levels in the blood plasma (Eales et al, 1982). On the other hand, Leatherland (1994) has demonstrated a close positive correlation between water temperature and the concentrations of both forms of thyroid hormone (thyroxine and tri-iodothyronine) in the plasma of brown bullhead. 

Figure 60 Expenditure of energy on total metabolism by populations of 1, anchovy 2, sprat 3, horse-mackerel 4, pickerel 5, red mullet 6, whiting.

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