214 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



whole production. Quantities are hatched previously, 

 masses are hatched daily, and new eggs are daily spawned. 

 Also they are distributed by the current over areas where 

 no spawning takes place. 



The natural spawning and hatching of cod eggs in 

 the fiord is also of much longer duration than in the 

 hatchery. Even before the fry of the hatchery are ready 

 for planting out I have found multitudes of cod larvae 

 in the fiords and the Skagerrak, and I have proved that 

 cod eggs and recently-hatched cod larvae occur in the 

 waters in limited numbers, even months after the opera- 

 tions at the Flodevigen hatchery have ceased. 



The natural spawning and hatching of cod eggs is, 

 therefore, in the small area, which I have investigated 

 round Kisor, of far greater dimensions than the produc- 

 tion of larvae at Flodevigen a production which is limited 

 to a shorter space of the season, and which is to be dis- 

 tributed over a large stretch of the coast. 



In 1905 a series of hauls was made in order to test 

 whether the adding of hatched cod larvae to the Sondeled- 

 fiord was capable of influencing the number of occurring 

 larvae. A few days before the first liberation of hatched 

 larvae took place, I made 20 hauls of five minutes' 

 duration in four stations. The net fished on each station 

 within 0, 2, 5, 10 and 20 metres of the surface. These 

 hauls were repeated on three occasions during and after 

 the period of liberation of the hatched fry. 



The following tables give the dates, the total catches 

 on each occasion, and the dates of the liberation of the 

 different portions of larvae : — 



