— 147 — JOHS. SCHMIDT 



only known fonnofly tVoui Uic Mcdilorrunoan in spcti;illy large (|iiantilios in theso 

 waters). 



The boundaries for the spawning are: 



northern limit: large Outer Bank W. of Ireland; 



southern limit: south of the regions investigated (occurs in the Mediterranean); 



minimum temperature: ca.8°— ü°; 



maximum temperature: ? 



principal spawning time: spring. 



16. L esser Porkbeard (Eaniceps raninus [L.]) 

 The northern and (probably also) the southern boundary lie within the regions invest- 

 igated. This form belongs to the species spawning in very shallow water and spawning 

 certainly takes place for the most part within 75 or even 50 meters. It is absent at 

 Iceland and the Faeroes, but spawns on the British Atlantic coasts, in the North Sea 

 (Skager Rak) and in the Channel. It has not been found spawning in the Bay of Biscay. 

 Spawning is unusually late, namely only in summer. 

 The boundaries for the spawning are: 

 northern limit: British Isles; 



southern limit: northern part of the Bay of Biscay (?); 

 minimum temperature: ca. 10° — 12°; 

 maximum temperature: ? 

 principal spawning time: summer and autumn. 



17. Torsk (Brosmius brosme [Ascan.]) 

 Both the northern and southern boundaries lie within the regions investigated. The 

 torsk does not spawn in quite shallow water, chiefly in depths about 200 meters (also 

 found spawning in from ca. 50— ca. 500 meters). Within these regions spawning is car- 

 ried on to the greatest extent on the Rockall Bank , on the S. and W. coasts of Iceland, 

 at the Faeroes and the northern part of the british Atlantic coasts. It spawns somewhat 

 also in the northernmost part of the North Sea, but not on the N. and E. coasts of Ice- 

 land, nor in the Skager Kak, the southern and central parts of the North Sea, the Channel 

 or the Bay of Biscay. 



The boundaries for the spawning are: 



northern limit: off N. W. and S.E. Iceland; 



southern limit: west coast of Ireland; 



minimum temperature: ca. 5^/3° — 6°; 



maximum temperature: ca. 9°; 



principal spawning time: spring, especially the latter half. 



The species dealt with here may be subdivided into groups according to their re- 

 quirements as regards depth, temperature and salinity during the spawning season. I give 

 herewith a summary of such groups according to the factors mentioned. 



19* 



