61 



Schmidt in tlie jourual. The descrii)tiou differs iu iio esseutials l'rom that giv^eu by 

 Ehrenbaum (1. c.) of the Agonus eggs at Heligoland. 



From tiiese observations it will be seen, tliat the pogge spawns in April 

 iu the Little Belt. Ehrenbaum (1. c.) gives the months January — April as the 

 spawniug time at Heligoland. Whether the pogge also begins spawning before 

 April iu the Danish waters has not been closely investigated. 



Eggs of tlie pof/ge were found in the Little Belt in April 1902: 



D. 10—4—02. Dreclged tor fisli .'ipawn at Fænø Kalv with the loothed dredge. Sjmwn 

 of poqge M-as taken, fixed between the roots of Laminaria dlgitata, as also a clump which lav 

 loose amongst the bottom-inaterial. 



D. 24 — 4 — 02. At Fænø Kalv. Some dredgings made on Alga- and Bryozoa-ground. 

 Spawn of the pogge amongst the roots of Laminaria digitata was taken. 



The hatchiug of the eggs proceeds very slowly, as will be seen from the 

 following journal extracts: 



D. 16 — 10 — 02. Nyborg (Great Belt). Well developed eraljryos with distinctly pigmented 

 eyes now appear in the eggs laid by a pogge in tbe tank on April 7th. The eggs lav In the 

 tank through the summer. 



Ehrenbaum (1. c.) cousiders the incubation-period at Heligoland to last 

 about a year, and it must have a similar duration with us, as appears from the 

 time at which the pelagic xjoung occur. 



In 1891 — 92 the Director observed the pelagic Agonus young in Fænø 

 Sound in the months of January and March — May. 



In 1903 the pelagic Agonus young were taken in Fæno Sound in the 

 months of March, April and Maj', but only in small numbers in May and not 

 later than the 13th. The catches from March Ist — 15th have been preserved in 

 the collections in a single bottle. Some very small specimens are amongst them, 

 as their size, measured on the preserved specimens, varies from ca. 9 — 13 mm. 

 The preserved pelagic specimens of later date, 1902, have a size of ca. 13 — 16 

 mm. It is probable therefore, that all the pogge eggs shed near Fænø in the 

 spring of 1901 have been hatched before the middle or possibly before the be- 

 ginning of March 1902. 



Iu 1903 we found the pelagic Agonus young in February — May, but in 

 May only during the first half of the month. 



Ehrenbaum and Strodtmann took them in February 1903, both in the 

 western and true Baltic, but only in small number. They found none in May. 



In 1904 (see Tab. 1) we found the pelagic Agonus young from January 

 to June, yet not mauy after Marcli. In June we found them only in the be- 

 ginning of the month, for example, on June 4th we took one specimen at Anholt 

 (see Tab. 1, Kattegat), and on June 7th one specimen N. of Hveen (see Tab. 1, 

 Sound). The last-meutioned was still small and was taken along with a small 

 specimen of the common Cottus (see under common Cottus). 



In 1904 we took the pelagic Agonus young in all the Danish waters from 

 the true Baltic to the North Sea. None were taken on the February and March 

 spring cruise of the »Thor« in the Skager Rak, though the youngfish trawl was used 

 a good deal (see Tab. i) and though not a few pelagic Agonus young were taken 

 iu the Kattegat by the »Thor« and in the southern waters by the »Sallingsund« 



