I. 



Wliere, and under wliat Coiiditious, caii tlie Eggs of 

 Plaice bc dcvelopcd iiito Youiig Fisli witliiii the Skaw? 



By C. G. Joh. Petersen. 



Contents. ,,„^^ 



Introdiiction 3 — 4 



On the tStock of Plaice in the Cattegat, the Belt-.Sea, and the Baltic Hen 



\n-oper 4 — li 



The Distrihution of the Fiy aloug the Shoies 6 — 16 



What aie the Cause.'* of the peculiar Di.strilmtion of the Fry? 16 — 19 



What inay be concluded from the Distribution of the Fry with respect to 



the Renewal of the Stock? 19—20 



Some General Remarks on the Distribution of Various Species of Fish, as 



Fry and as (irown up Fish 21 — 23 



What ought to be the Particular Object of Future Internationallnvestigations? 23—24; 



Introduction. 



Tweuty year.s have passed now siuce V. Hensen published his origiual 

 aud beautiful studies ou the eggs of the plaice in the western part of the 

 Baltic Sea, and it is some ten year.« siace I started the question of the oc- 

 ciirrence of the fry of plaice on the Baltic shores. But not till these last 

 years have auy new data beeu published, which throw light on the que.stion 

 whether the plaice is able to live through its ivhole development, from egg to 

 grown-up fish, in the rurions parts of the Baltic Sea. Not till now, therefore, 

 we can begin to form an opinion on such questions as: In which regions 

 is it possible? Is it possible every year? To which extent may it be sup- 

 posed to contribute towards the preservation of the whole stock in the 

 various piaces? These (juestions are not by far solved as yet; they have 

 been set forth only with greater precision. The whole matter still deserves 

 renewed investigation, if it is to be of that use to practical fishery which a 

 close understanding of it seems to promise. Therefore it has beeu taken 

 up also for international investigation in "Commission (J" for the investigation 

 of the Baltic Sea. 



