LYCODINjE. 



Of the o-enus Lycodovus only two species are present from the region here considered: L. 

 flagellicauda Jensen which inhabits the polar depths from Spitsbergen down to Iceland and the Faeroe 

 Channel and /-. ophidhtm Jensen of which only a yonng specimen from the depths of the Atlantic 

 Ocean (sonth from Iceland) has been found. Cf. for the rest, the synoptical table. 



Biology. 



The Lycoditice are bottom-fishes which swim b\- vigorous movements of their strong tail. As the 

 fishing apparatus often brings them up alive to the surface, even from great depths, one can well 

 believe that they are tenacious of life. Lycodes frigidits. for example, which is essentially a deep 

 water fish, was kept alive during the Norwegian North-Atlantic Expedition by being placed in some 

 water in a tub; according to Collett, they generalh' remained at rest in a half coiled-up condition, 

 somewhat like Zoarces viviparus. During the Michael Sars* expedition of 1902 I placed two Lycodes 

 esmarkii, taken from 275 fathoms depths, in a tub with water and they remained alive several hours; 

 other individuals of the same species showed themselves extremely active on being preserved and 

 remained living for a long time. 



According to the observations of Collett, myself and others, the Lycodi7icr live chiefly on 

 Crustacea: copepods ^C«/rt;///.9;, cumacece, isopods, amphipods and AtcSi-pods (H/ppolyte, Hymenodora ttc). 

 In the alimentary canal of the following species onl\- the remains of Crustacea were found: Lycodes 

 rossi, L. reticu/atns, L. semiiindus^ L. agnostits and Lycodonus flagellicauda. Lycodes vahlii and Lyceii- 

 chelys sarsii feed both on Crustacea and small bivalves. Lycodes frigidns according to Collett, lives 

 chiefly on Crustacea, but he has also found in them the remains of a cephalopod; during the Ingolf 

 Expedition a Goiiatus was found in one, and I have taken from their stomachs the beaks of ink-fish 

 and remains of fishes. Collett found fish remains in I^ycodes liitkenii. Lycodes endipleHrostictits 

 feeds on Crustacea, but one just as frequently finds in them the tubes of tubicolous worms, and once 

 I have taken a Priapulus from its stomach. Lycodes esmarkii seems to feed exclusiveh- on echinoderms, 

 especially ophiuroids, partly also on Antedoii and Echijuis ; both Collett and I myself have found 

 their stomachs and intestines crammed full of broken skeletons of these animals. 



The Lycodince are not despised either by other fishes. At West Greenland they are found not 

 rarely in the ston:achs of the sGreenland shark» ( Somniosus microcephalus) ^ and I ha\e once taken 

 a Lycodes (indeterminable) from the stomach of a cod. 



Concerning the beginning of the spawning period but little is known. Collett says that 

 Lycodes esmarkii spawns in the early winter months at Finmark, and that L. vahlii (= L. gracilis) spawns 

 during July — October in the Skagerak; I have found the last named species with ripe roe in the 

 beginning of July (Iceland). In the <cold area» (the Polar Depths) the breeding time may begin at 

 the end of August, as I have observed the ripe roe at that time in Lycodes frigidus and L. 

 eudipleurosticttis . 



The Lycodince are oviparous. The eggs are of considerable size and consequently relatively 

 few in number. Collett has found ovarian eggs in Lycodes esmarkii which were 6 mm. in 



