how r. loviT degree of solinity kills tlie youn^, , 110^7 henvily the devel- 

 opment depends upon the temperature, Y;-hich food t;cvs best for the 

 lobster Inrvae nnd so forth. He also succeeded in rer.rint^^ the 

 lobster Inrvae to the bottom stcxge, but on account of the cannibal- 

 ism of the young lobsters, the rearing could not be conducted on a 

 larger scale* 



In 1893 the lobster Y/ork in this country was taken over by Dr. 

 Appell/^f . He made many observations concerning the biology of the 

 lobster r He studied the grovfth of the lobster and introduced a 

 nexT tagging sj'^stem in order to study the inigrations of the lobster. 

 Rirther he introduced an American method for the rearing of the 

 brood. (Appell)!^f 1909). 



On the basis of Appell/f's investigations there v/rs decided 

 in 1912 to start rearing of lobster young. This work v:r,s taken over 

 by Assistant of Fisheries, Oscar Siond, vrho established a floating 

 rearing station for lobster young at Xorshavn in Vest-Agder. This 

 T/as built according to anjunerican system, the same v/'hich was tried 

 by Appell/f . Sund worked v/ith this apparatus in 1913 and 1914, 

 See 0. Sund: Repo rt on theJSuilding of the State's Rear ing_ Station 

 for Lobster and on "the" ifork T913V "in /JJlSiSERETNING BED'YoiIiEI i DE' 

 HORGES FISKERIER, No, Z, 1914, and The State's R oa ring Station for 

 Lobster in /JulSBERETNING VEDKOlSiEEKDE NOKGES FI3I<1rIER, i>lo, 2, 1915. 

 The results of the experiments fell short of the expectations. 



VjVien the metamorphosis of the young lobster ends v/ith the 

 ■transition to the 4th stage, it also changes its appearance. A 

 young lobster in the 4th stage is easily recognized among a swarm 

 of lobsters in earlier stages, because it has then acquired the 

 elegant lobster shape. YJhile the young lobsters earlier have been 

 some\7hat bent with the claws hanging dovm, the body is now straight- 

 ened out completely and the clavj-s are stretched for'/irrd. 



Lt the beginning the nev/ly hatched young lobsters swim around 

 in the water - in an aimless fashion. ■ They are eagerly searching 

 for food and grasp all floating prrticles. If they do not find 

 anything suitable, they eat each other. j'i.f t er • a ■ f ew days they become 

 somew?iat heavier and are apt to gather at the bottom of the aquarium. 

 But after having changed their shells - wViich normally takes place 

 after four or six days v/ith us - they once more sv/im easily r round 

 in the water. The same thing is repeated after the two next chang- 

 ings of shells. 



A.1eo in the 4th stage t?iey are .good sv;immers at the beginning 

 in spite of the fact that they have lost their svj-ir.iiainp setae; 

 they now swim by means of rrell developed pleopods. In the course 



87 



