Knowledge of the energy stored in communities is important in ecology. However, the determination of energetic content is laborious and time consuming. In order to facilitate the laboratory work done to obtain these data, some relationships between length, volume, surface, wet and dry weights and ash free dry weight were calculated regarding 18 species of ascidians. In addition, as the few energetic values known for ascidians are low and outside the energetic range common to the majority of other animal taxa, the energetic content of six ascidian species, was determined by analysing their biochemical composition. Our analyses showed that ascidian energetic values are included in the normal range of other animals but are located in its upper limit, and even higher in three species.
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