Abstract
1. 1. The water, sodium, potassium and chloride contents of serum and muscle of yellow and silver eels ( Anguilla anguilla L.) in fresh water and sea water are given, together with urine output and glomerular filtration rates. ∗ Ion concentrations m-moles/kg tissue H 2O Type of eel Freshwater Seawater Na + K + Cl − Na + K + Cl − Serum ∗ ∗ m-moles/1. 155 2·7 106 178 2·8 155 Parietal muscle 30·4 110·1 35·0 124·7 “Tongue” muscle 41·9 112·6 47·9 121·7 Urine ∗ 18·9 0·65 Nil 6·5 2·08 119·4 2. 2. The results are discussed in relationship to the general problem of the adaptation of vertebrates to water of differing tonicity.
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