38 



Table 15. 



Female eels from Nyborg Fjord. 

 2.Sth— 3()th Jnlv 1906. 



Relation between length and weight. 

 Length in centimeters. 

 Age given by annual rings on scales. 

 Age in kvints (100 kvints = l.j 

 Ibs. Eng.) 



7 aDnual rinirs. 



108 



87 

 81 

 65 

 76 



5(i 



witli scales of corresponding age. It thus appears that the iucrease iu thickness 

 is uneven and oecurs especially in certain years; and a consideratiou of Table 15, 

 which shows the relation between length and weight within certain year-groups, 

 leads to the same result. It will be seen from the Table, that iu the fourth year 

 (column 2) the increase in length is 16%, in weight 66%; in the fiffh year it is 

 12 "/o and 52 "'/o ! but tliese numbers must not be considered as absolutely trustwor- 

 thy and asgiving the normal increase; for this purpose the investigations are still of too 

 little extent. Rut the Table yhows the way by which the matter may be unra- 

 velled in the future, — a matter which has very great praetical inportauce and 

 not least with regard to the question of the right size-limit for the capture of eels. 



