and tlieii the »Salliugsuud« made short or long excursious, using on Ihose occasions 

 the youDg-fish trawl. 



lu 1903 and especially in 1904 very comprehensive iuvestigations of the 

 pelagic fish eggs and youug were made according to plans drawu up by the 

 Director aud carried out under his directiou by the author. In 1903 the young- 

 fsh trawl was used only to a limited extent, the pelagic toiv-net being aloue em- 

 ployed at many stations, and as the larger specimens of the young fishes are but 

 seldom taken iu the pelagic net, we cannot obtain a complete picture of the kind 

 and uumber of youiig present, when ouly this apparatus is used. On the other 

 hånd all sizes of the pelagic young, at any rate of the species found in Danish 

 waters, can be taken by the youngfish trawl. It is better therefore to use only 

 the hauls with the young fish trawl as basis for a view over the occurrence of the 

 tish young. The eggs are therefore iuvestigated by meaus of the pelagic towuet, 

 the young by means of the young-fish trawl. 



The Tables 1 — 3 (see p. 72 — 84) have been drawn up on this principle; for 

 1903 only a summary of the hauls iu which pelagic young were taken is given 

 (Tab. 3 A), for 1904 both a special table (Tab. 1) and also summary tables showiug 

 the hauls of pelagic eggs (Tab. 2) aud of young fishes (Tab 3 B). 



The stations where surface and intermediate hauls were made with the 

 pelagic tow-net and the young-fish trawl are noted in Tab. 1 from the Journal for 

 ] 904. For each station is given the date, place and hydrographical conditions, then 

 the eggs taken, tvith the pelagic net and the young taken with the young-fish trawl. 



The stations are placed in chronological order for each of the regions* into 

 which the Danish waters are divided. 



The place is determiued by data showing the bearings: distance in nautical 

 miles aud depth in fathoms (1 fathom = ca. 2 meters). The water-samples were 

 taken by means of a water-sampler and the scdinities determiued by areometer 

 on board. 



The hauls made with the pelagic net** were partly vertical, partly hori- 

 zontal. The vertical hauls were always taken to the surface, the tables show from 

 what depths. In order to take the pelagic eggs near the bottom we used the 

 "pelagic net on a pole", that is: the net was fastened to the top of a pole a 



* The boundaries between the region.s are shown on Chart I p. 24; they are as foUows: 

 Line Hanstholm — The Naze separates North Sea and Skager Rak, 



» Skaw hghtship — Marstrand > Skager Eak and Kattegat, 



> Elsinore — Helsinborg > Kattegat and the Sound. 



> South end of Samsø — Refsnæs > Kattegat and Great Belt, 

 • Ashoved — Endelave — South end of Samso > Kattegat and Little Belt, 



> South end of Samsø- Nord-east point of Funen » Great Belt and Little Belt, 



> Copenhagen— Malmø » The Sound and true Baltic, 



» South end of Langeland — Albuen > Great Belt and western Baltic, 



■' Thorø — Aarø > Little Belt and western Baltic, 



> Ged.ser — Darsserot > Western Baltic and true Baltic. 



Thyborøn and Hals are the natural Ijomidaries of the Lim Fjord towards the North Sea 

 and the Kattegat. 



** Gauze Xo. 0; opening 90 cm. iu diameter. For description, see: "De danske Far- 

 vandes Plankton", I, p. 233. 



