The present study is mainly a descriptive account of the food and
feeding of the two Scottish powan populations from Loch Lomond and
Loch Eck. Quantitative and qualitative comparisons of powan diet are
made. Seasonal variations of diet are determined for the two
populations and some aspects of the planktivorous feeding of adult
pawan in Loch Lomond are examined. The partitioning of the ingested
energy into somatic and non-somatic growth is considered. Factors
affecting the feeding of the two populations are discussed.