244 Appendices to Fifth Annual Report 



4 begins to get cold, which generally happens in .November. That they 

 ' thus go, so to say, into the very jaws of their many enemies, and that a 

 ' great part of them are thus destroyed, has nothing to do with the 

 ' question iu hand, for the individual which escapes these dangers gets 

 ' into warmer water and more comfortable existence. Such an emigration 

 ' cannot take place in the basin except in as far as they seek the deepest 

 ' hollows, where they usually remain ; that this must exercise a great in- 

 ' fluence on their development was easy to foresee. In cold weather they 

 ' entirely abstain from food.' 



Table showing Rate of Growth of Young Cod. 



Date. Age. Size in millimetres. 



April 26 0 days 3 



May 3 6 „ 5 



„ 16 19 „ 7 



„ 18 21 „ 8 



„ 21 24 „ 9 



„ 31 1 month 5 „ 10 



June 3 1 „ 8 „ 12 



n 6 1 „ 11 „ 15 



July 12 2 „ 15 „ 55 



Aug. 12 3 „ 15 „ 70 



Sept. 12 4 „ 15 „ 85 



Oct. 12 5 „ 15 „ 115 



(Longest example caught at same time, 157 mm.). 



Since February, notwithstanding many adverse circumstances (including 

 for a time the stoppage of the pumping of sea water), the young fish 

 have considerably increased in length, and, as already mentioned, some of 

 the cod are now over a foot in length.* 



During recent years, by numerous and often extensive experiments, the 

 great principles of fish culture have been established for both sea and 

 fresh water fish. The observations of Dannevig owe a great part of 

 their importance to the fact that they confirm, as far as they go, the con- 

 clusions reached at Howietoun and elsewhere as to the influence of extreme 

 temperatures, sudden changes in the surroundings, rate of growth, <fcc, 

 on the eggs and young, and also on the full-grown fish. 



* I am indebted to Mr Webster, Librarian, University of Edinburgh, for preparing 

 abstract of Mr Dannevig's Keport. 



