Demersal fisheries

The total annual landings of demersal fish from the English Channel during 1976 were approximately 20 000 tonnes. This is equivalent to approximately 0.25 g wet wt-m-2-yr-1, or 0.04 g dry wt-m-2-yr-1. If the calorific value of the fish is taken as 5 kcal-g-1 dry wt, the energy content of the catch was 0.2 kcal-m-2-yr-1 or 82 X 109 X 0.2 = 16.4 X 109 kcal-yr-1 for the whole area. As a proportion of the annual production of demersal fish, the fishing yield amounted to

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