!• The larvae- do nob- sink and pile up at the Lotton. 



2. The food in_ the v;ater reiiiains suspended, 



3» The, larvae, be.ca.use of the no"'*eiP.ent of the vjr.ter, 



cannot attack each other, go that cannibalise is 



mininized.. ■,:.....,. 



For a detailed descripti':':: I refer to ifead's articles 1^^ and 



1/ State Ox Rhode Island and Providence Plantations. 

 Pue'-'ort of the Coinmo of Inland Fisheries IGOl - 1910 



others. Chiefly the arranf^OKont "is ho^Tever as follov/s: Alongside 

 a raft on which a machine shop is located are other rafts constrvxc- 

 ted of skeletons of timTjers. '.'ithin these latter raits, whose 

 buoyancy is considerably increased by neans of a number of pontoons 

 or barrels s are suspended larfjc wooden cases of a surface of 3 x 3 

 meters and a depth of IdS m. In these cases, submerged e;;cept fcr 

 the rims J the larvaq must be reared* Changing of v/ater is taken 

 care of by rrindOTTs of copper screen of a raesh so fine .that the 

 lai'vae cannot passo Each case is provided with a vertical shaft 

 to which two blades are attached and which turris at a velocity of 

 about nine revolutions ver minutct L'otive power is provided from 

 the central raft and the operation is c.jrtinuous around the clock, 



•This aEse:.bly gave, over succeeding; yc-ars, proof pf great 

 practical usefulness. It rer.chod a r:)oint where annually several 

 huncreds of thousands, yes, in 19;?0 even more than, one million 

 larvae were raised past the larvae stage. 



The method soon v;as copied and in Norvray Pro Appell/f built 

 a pilot unit at a cost ^f only C290o - witli vriiich he succended in 

 br-in.'^in:; 20 to 30 per cent of the larvae into the fourth stage* 

 The fact that his percentage was lower than Mead's at Tfickford is 

 perhaps explained by the longer period required for larvae to 

 attain that stage in tho colder water of Norvmy* In 1912 the 

 Norwegian Parliament allotted 6200 Kronen tpviards an improved 

 ariparatus. This was completed in 1913 and was an exact, copy of 

 the one tit Vfiokford, The results however were exceptionally bad 

 and only about 1000 Ir.rvae were obtained. The next year' showed 

 no increase,- the nuir^ber of lobster larvae to reach "bottom" stage 

 vras but 1600, Liuch difficulty was also experienced in the hatch- 

 ing of eggs»' Blame for these poor results were •"'laced chief 1;/ on 

 the appearance of a parasitic worm, ilist riobdella l/ ; v/hich attaches 



ly' Meant here is Ilistri obde lla^ horary. , a v/.orn like pr.rasite of 

 the lobster^, which lives mostly oe the eggs,, Mrr A., Danne- 

 vig, assured me later verb ally, that this was probably not 

 the reason. 



127 



