Dannevig, Alf 



1932 Beretning ora virksomlaeten ved Fl/devigens utklckning- 



'"' sanstalt for termlnen 1929-1930. Aarsberetning ved, 

 l^'^orges Fiskerier 1930, nr, 1, pp. 101-119, illusr 



Report of the vrork at Fl/devigen hatchery for -the period 



1929-1930 



^* Rc'^-J^i ^ ig of lobster 



On July 6 n total of 185 spavm lobsters v/as purchased fron 

 AakerBy. They weig^ied together 97- kilograms of nn average of 0.53 

 each. The'- details with regard to the gathering of nev/ly hatched 

 young, collection of young in the bottom-stage, together v;ith the 

 temperature and the degree of salinity of the sea water, v/ill be 

 seen from the Table in the back .of the report, (p, 118) The 

 usual working v/ith the night vratoh started July 19. A sui.imary 

 shows the follov/ing: 



Gathered July 9 - August 28 e.bt« 232,169 young 



Liberated in the sea due to lack of space " 76,5 25 



Left for rearing " ,155,644 



Reared to 4th stage " 46,200 



Liberated in other stages, especially 3d 1,144 



This gives about 30 per cent in the 4th stage - a result a 

 little simller than the preceding year which gave about 

 34 per cents 



The different experiments developed as follows: 



Experiment I (Apparatus l) 



July 9-13 In ,11,060 young 



" 22-30 Released 2,308 in 4th stage, e.g. 



about 21 per cent 

 " 30 Transferred to Exp. 2 302 in 3d stage 



Experiment 2 (Apparatus l) 



■V.July 14rl5 In 11,208 young, 



• " 30 Transferred from Exp. I 302 in 3d stage 



. : " 'Sg^Aug. 1 Let out 5,540 in 4th stage, e.g. 



about /i 9 per cent 

 Aug. 1 Transferred to .Exp. 3 600 in 3d stage 



77 



