31 



In November 1904 we made a very extensive investigation of the stoek 

 of cod on the coasts of Funen. Tab. C shows that the catch of the O gr. was 

 greatest in the Little Belt, less in the western Baltic and inconsiderable in the 

 Great Belt. Search was only made for the O gr. in shallow water on algæ or 

 Zostera-covered grouud, but the search here was very thorough. The small number, 

 c. 15 of O gr., taken in the Great Belt is iusignificant compared with the numbers 

 taken at the same place in the following spring (see Tab. D, February, Great Belt). 

 In the course of the winter an inward movement of the cod young to the coasts 

 takes place, and this happens each winter. This phenomenon, .so far as it has 

 yet been explained, has been noted by the Director in Beretning XI of the Danish 

 Biologicai Station. 



In "Eier uad Jugendformen der Ostseefische, 1 Bericht", E. Ehrenbaum 

 and S. Strodtniann discuss the German investigations in the western and true 

 Baltic in 1903. The investigations Avere made in February, May and August. In 

 February there were uumerous cod eggs in the western and a few in the true 

 Baltic. In May the number had sunk considerably in the western Baltic, but in 

 the true Baltic there were more cod eggs than in February, and a large number 

 occurred especially in the deeper layers of Bornholm Deep in this month (E. of 

 Christiansø, c. 50 fm.). Only a small number of pelagic cod young was found by 

 Ehrenbaum and Strodtmann, all in the western Baltic in May and all small, 

 under 1 cm. 



Resumé. Cod eggs were found from January to May, in the months 

 March — May practically every-where, in January and February only in the southern 

 waters. 



The pelagic cod young appear in February to June in all the Danish waters 

 except the true Baltic, where none were take at any time. After June pelagic 

 cod young have never been found, but the hottom-stages appear at this time, partly on 

 the algæ- or Zostera-covQveå grounds at the coast, partly on clear ground in deeper 

 water. Even in the pelagic stage the cod young were more numerous in the 

 western part of the Belt Sea than in the eastern, and in the bottom-stage they are 

 restricted to the western part. Thus the bottom-stage was not found at all in the 

 Sound, nor sometimes in the Great Belt with its extensions to the nortli and 

 south (see chart p. 24), but it was always very frequently represented in the Little 

 Belt and the western part of the western Baltic. The bottom- stages occur in the 

 northern Kattegat and in the true Bal tic, but not so many as in the Little Belt 

 and western Baltic. This irregular distribution of the cod young is caused by the 

 hydrographical condittons. 



The cod young groiv principally during the months June— October and in 

 the course of the first year reach a size of ca. 10 — 20 cm. 



Whiting, Gaclus meriangus. 



Investigations in 1904. 



We have not detected the wliiting eggs in Danish waters during 1904. 

 Pelagic wliiting young were tirst met with wheu we were in the Skager 

 Rak on the 28th of April: 



