37 



gust, 011 an average, only 1 ineh long; but it is also a couple of months 

 youuger than the plaice of the 0-group, which liave been caught at the 

 same time. 

 The Brill [Bofhiis rJiombus) and the Tnrhot (Bothus maximus). On the sand- 

 banks we meet only tlie 0-group, which in August is nearly 2 inches long. 

 The Sole (S(jlea viilgaris), the fry of the year as well as the grown-up fish, 

 at any rate in the summer. 



As above mentioued, Gohius minutus is properly at home in this locality. 

 Its breediug-time is the month of June, at which time we may find fine fur- 

 rows in the sand, where there is an empty shell of the saud-gaper {Mija are- 

 naria). These furrows are produced by the male gobius, which watches the 

 eggs, deposited on the underside of the shell, and which constantly, with its 

 fins, wafts a fresh stream of water in to the eggs. 



The fry of this little fish, however, does not live constantly on these nak- 

 ed sand-banks, where it finds too little food and protection, but emigi-ates to 

 the bottom where there is a vegetation (See The Zostera Belt). 



As migratory fish, large shoals of young herrings come in pretty often 

 in the course of summer, on quite shallow water, where they are pursued by 

 the sand-eels [Ammochjtes lanceolatus). We see the shoals constantly being 

 spread, and the young herrings flying to all sides, when these greedy fish 

 quick as lightning pursue them. 



Also the pipe-fish {Siphonostoma typhlé) is often seen in here; but it is 

 not particularly at home here, as Uttle as the eel, which now and then comes 

 in from the zostera belt. 



Of lower auimals living on the sand-banks ^\•e find chiefiy lug worms 

 [Arenicolu) and various crustacea, especially large masses of opossum-shrimps 

 [Mysis), shrimps [Crangon vulgaris), and the common crabs [Carcinus mænas). 



b. The Zostera Belt. 



The Journal-numlsers : 64a, 65a, 72, 73, and partly 112. 



The zostera-vegetatiou in the northern part of the Cattegat is not by 

 far so rich as in our more closed seas. At the Skaw the zostera-belt is very 

 narrow; it spreads a little more in the Aalbæksbugt, and reaches at Frede- 

 rikshavn about a Danish mile in width, extending as far as Hirtsholmene. 

 Towards south, in the Læsø Rende, it becomes still wider. The expansive 



