Age and Rate of Growtli of tlie Eel 



by 

 K. J. Gemzøe, 



Assistant at the Biological Station. 



Con ten ts. page 



Introdnction 11 



Statement of the question 12 



Its importance 12 



Earlier views and criticism 12 



How the question is to be answered 13 



The necessary material 13 



Metliods of determining the ago 13 



Method by measurements 

 By means of the scalee 



Structure of the Bcales of the eel 14 



Scaly fovering of the eel 17 



Annual rings in the scale of the eel 19 



Comparison with the scales of gadoids 19 



Periodicity in the life of the eel 20 



Earlier views of authors 21 



Proof of the determination 22 



When and where the first scales are formed 24 



Yeargroups of the eel ; its growth 25 



O group = Ist year 25 



I. > = 2nd . 28 



II. . = 3rd . 31 



The remaining yeargroups 33 



Males and females 

 Silver eels 



Answer to the question (cf, p. 12) 37 



Growth in thickness 37 



Resumé 39 



