If it is the case that the eel migrates as a rule in the upper layers, we 

 have all the more reason to expect that artificial surface-light (by projectors) can 

 affect their migrations; but for the time being I do not know what happens under 

 greater conditions: the experiment must first be made. 



The Biological Station has no rights of eel-trap fishing except over quite 

 a limited area at Oddesund. where the fishermen have rights in the neighbour- 

 hood. It seems to me more natural therefore that these experiments in future 

 should Ukewise be continued bj' owners of large eel fisheries, who have large tracts of 

 water at their disposal. These owners are undoubtedly warrauted in making them. 



The light-projector mentioned has a streugth of 10,000 power normal light 

 and can be obtained for some few hundred kroner inclusive of the acetylene-holder 

 etc. I should imagine that the experiment would be successful, if made from 

 the outermost pole of the eel- trap, the light being shone obliquely forwards so 

 that it would cause the eels to enter the trap, where they would otherwise pass 

 beyond it; or if the net of the trap is far below the surface of the \^ater, then 

 the projector should be placed on one of the outer poles and the light shone 

 inwards along the trap, so as to hinder the eels from swimming past over the 

 net and its guides. It must be remembered however that such a light-projector 

 may diminish as well as increase the catch in an eel-net or trap, all according as 

 the light is well or badly placed, and that the matter is as yet insufficiently tested. 

 It is only by continued investigations that we sliall arrive at the right method of 

 working. That the light-projector may easily prove of advantage in .such waters 

 as the mouths of Nissum Fjord and Eingkjøbing Fjord, I eonsider certaiu, in 

 spite of the faet that æv 1905 experiment at the first place was without result. 

 The light-projector is cerlainly much easier to handle than the lauterns then used. 

 It is possible that in smaller waters, e. g. Svendborg Sund, the acetylene flare- 

 lanterns common there made do good service. If any one is willing to undertake 

 such experiments I am willing to give them all the information I can, as I must 

 always eonsider it of advantage for our fisheries, that the methods of catching the 

 migrating eels in this country should be improved as much as possible. We obtaiu 

 as j'et far too little advantage from the quantities of eels which pass through our 

 Belts and the Sound. 



That this account is not entirely fanciful is shown amongst other things 

 by the conditions at tlie opeuing of the Nissum Fjord iuto the North Sea (Thors- 

 minde). The outlet (»Mindet«) was closed during the period of the eelmigration 

 in 1906 by the sea throwing up a sand-heap right across it. The eels continued 

 however to stream towards the closed »Minde <; they could clearly detect the sea- 

 water through the sand; and according to notices in the papers there, confirmed 

 b\' men known to me, ca. 12,000 Ib. of eels were fished within a short time. 



Before the moonless nights of November came, the 'Minde« was again open. 



The notice concludes: »What enormous quantities of eels there must be iu 

 such a fjord, and what wealth passes during the three moonless periods out from the 

 Lim-Fjord through the Thyborøn Caual into the North Sea, wealth that never returns.« 



This is true; we must learn how to stop the eel-migration each year, at 

 Thorsminde as well as in Ringkjøbiug Fjord and Lim-Fjord, because it is all a 



