(Histiriobdella homari) was found on all individuals, and on several 

 lobsters were also found red eggs in smaller or larger nmiiber. It 

 is possible that the doath of the spawn is caused by some kind of 

 fungi or bacteria e Next year v/e shall make specific experiments 

 "if the red spawn should occur cgain." 



V^Then the young had been hatched in the hatching boxes, they 

 were taken up and transferred to nev; boxes in order to keep the 

 different stages separate. 



We should liave expected a couple of 'millions of yovmg from 

 the 400 spavm lobsters, but the hatching proceeded very slowly 

 and all the time v/e found a great deal of unhatched red spawn in 

 the boxeso The total hatch of living young v/as 58,700, i.e. only 

 l/40 of the n\imber of eggs on the lobsters. 



The Development of the Young 



The development of the larvae proceeded more quickly than 

 stated by Dr» Appell/f at Hvittings/. In 1913 he found that it 

 took about 26 to 29 days for the young to pass through the first 

 three stages; in 1908 he found that the third shedding of shells 

 occurred about one vreek earlier, ioe« after 19 to 22 days, prob- 

 ably because of the higher temperature of the last mentioned yoarj 

 during the time he made his experiments the teiapera.ture was 

 between 14 and 17 degrees C, average 15.9 degrees. 



Some of the experiments at Korshavn did not even take that 

 much time, which will be seen from the follov;ing Table: 



Time: Duration of Temperature 4th Stage 



3 first Eta- High- Lov/- Aver- llumber % 



ges (da2/s): est est age _ 



Tb/i"- 9/8 'Te'-'zi'""'^ T8°".0'""l?r^if *^'l5"o.T " ' ' ^ 25" 1,'2 



27/7 - 20/8 18 - 25 18°,0 13°. 16°. 68 0.5 



29/7 - 23/8 18 - 26 180.0 130.0 160.1 117 lo3 



l/8 - 24/8 18 - 24 180.0 ISO.O 160»2 434 9.0 



9/8 - 26/8 12 - 17 18^.0 I40.5 leo^S 211 8.1 



On figure two the time v;hic?i elapsed from the beginning of the 

 experiments up to observrtion of the first young lobster in the 

 4th stage, has been marked as horizontal, lines at tho top of the 

 diagrai.ie You vj-ill see at once that the development proceeded 

 more quickly during periods with steadier and higher te:iperature» 



The Results . 



From an economic point of view the result of the sumi:ier's 

 work was very poor: instead of the expected 200,000 to 300^,000 

 yomig in the 4th stage v/e got only 1,000. On the other hand vre 

 had a. good deal of valuable, although partly bitter, experience* 



162 



♦ ? 



