Dnnnevig, Alf 



1921 Fl/devipens utkloelcrdnjrsnrstnlt, i-arsberetning ved, 



ijorgcs Fiskerior, for 1921, hefbc 1, pp. 105-108 



Fljz(dcvi';en hatchery 



Lobster 



The vj-ork vith the rearing of lobster vtc.s str.rtec July 14 v/ith 

 53 spo-wn lobsters end v/as finished August 11« The cxperinents v;ere 

 nade in order to try some new rearing apparatus of galvanized iron 

 sinilar to those \7hich v/cre used during the siirjner 1919 (see Report 

 for 1919/20). The experiments v/ere better than those of the pre- 

 ceding years, but they v/ere not cor.pleted; there r;ere still inpr"ve- 

 nents to be nade. These have nov: been finished - and the experii.ients 

 v/ill be repeated this season in the changed apparatus* 



During the season there v/ere gathered in all about 24,000 young, 

 a result which nust be regarded as satisfactoi-y, as a great deal of 

 the lobster eggs had been hatched already before the mother lobsters 

 were put into the apparf.tuso 



The hatching proceeded vfithout accidents of any kind. 



The grcf'tor part of the young T;ns used for different experi- 

 ments, of which several failed completely; 486 v/ere liberated in the 

 4th stage and a fev; thousand in the firsts 



The tagging e::periiiicnts, mentioned in my earlier reports, vrcre 

 continued - and with cons i'''er able success. A good n\mber of the 

 tagged lobsters are recaught, and they give us a sound basis for our 

 knov/ledge of the grovjth and the migrations of the lobster. I have 

 given prel-irdnary reports on these investigations in Norsk Fiskcr- 

 iticleride for 1919, p, 47j 1920, p. 80, and also in the 'report which 

 will probably appear in the July-August number of this yearo V;lien 

 the experij.-ients have been finished, we intend to gather the results 

 in a special report. 



It seems that the lo':ister is extraordinarily stationary, at leost 

 in the locality where the experiments have been made (Fl(?(dcvigen) . 



The results will also be of importance for the problem of raising 

 the minimum size; in planning the experiments I have taken this prob- 

 lem into consideration. 



These investigations will be continued, but in order to get ns 

 general r esults as possible, we shall experiment in another locality, 

 i.e. one of the outer shoals. 



50 



