Anchovy expenditure

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.

Figure 61 Expenditure of substances on total metabolism during a year by anchovy. Whole column wet matter light stipple lipids heavy stipple proteins. The small numbers represent age groups.

The next step comprises the assessment of the biochemical cost of production of the energy equivalent of weight. It is found that, in order to produce 1 kcal, the anchovy assimilated 5.7 g of dry matter, sprat 3g, horse-mackerel 2.4 g, red mullet 0.6 g, pickerel 0.7 g and whiting 0.6 g. It is also evident that energy expenditure on construction processes is much higher in mobile than in sluggish fish. 

Figures 69 and 70 show the balance of dry substance and energy for populations of Black Sea fish observed over annual cycles. The total production, metabolic expenditures, and food assimilated and consumed are illustrated. Very similar patterns can be obtained on the basis of wet material and protein. The figures demonstrate that the energy balance of the populations of Black Sea fish alters considerably over the annual cycle, ranging from 0-10 to 30-270 cal g 1 day1 for the total production and food consumed, respectively. The balance estimates vary most in anchovy, then,...

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