times in genernl should 138001116 so c}iosen thnt at least a iDalnnce 

 betv/ecn captvire and grovrfch remains regulated and is preserved. 



These regulations render it possible principally to preserve 

 the lobster stock at a def '.nite level;- not rarely hov/ever economic 

 conditions appear to stand in the way of their performance, then 

 however an alv/ays continuing decrease in the catch is the unc^void- 

 .able result. 



Artificial roaring, '.ie Icnovr that the fertile eggs are glued 

 fast to the hind trunk of the mother until they become ripe and 

 that they, during all this time, r.re protected e xcellently from 

 all possible dangers and enemies. As soon as the larvae are hatched 

 out hovrever, they do without this protection on the part of the 

 mother and are exposed to many dangers during their plarJctonic 

 life. A very j^r eat percentage run into destruction in this period, 

 the most critical period in the life of the lobster. Considering 

 the near related crayfish lacks this dangerous planlctonic period, 

 consequently this needs for the maintenance of its species about 

 100 eggs, while the lobster in the saLie time produces about 

 20,000 eggs; the nev/ly born crayfish h;\s about the same valvic as 

 200 lobster larvr.e for the maintenance of the spc=cies. 



The artificial hatching of the eggs has no purpose; in this 

 regard the natural situation is not to be bettered* American 

 plantings of millions of newly born lobster larvae have consequently 

 also not led to results. Only when the egg -bearing females are not 

 protected legally, has it a purpose to allow the eggs5 to hatch 

 artificially since they else would be abandoned to destruction. 



A rational artificial rearing must . occupy itself vdth the 

 young lobsters during their planlctonic life; they must be reared 

 until attaining the bottom stage and can then become quietly 

 released to natureo Since the ripe lobster eggs .r.re readily 

 obtained in more satisfactory nxmbers and t he-planktonic life 

 lasts only a short time, principal obstacles do not stand in the 

 way. So much the greater are the practical (ones) v/hich are the 

 reasons thr.t until yet boday no good method for the artificial 

 rearing of the European lobster vrhich guarantees success exists, 

 although it has not. lacked research to bring the problem to 

 solution (G. M. Dannevig, Appell/f, Sund, A. Dannevig). The 

 greatest obstacles are the helplessness of the larvae and, apparent- 

 ly in contradiction with that, their cannibalistic tendencies, since 

 they ore crowded together in a small space in the retiring tankso 



A broader difficulty is that the larvae and the food must be 

 kept floating by the motion of the -;>rater,, that .howff-.^or no direct 

 cur'^ent is allowed to be present since then the weak larvae becone 

 carried along and pressed against the '.vails. Tlic merit is due A» 

 D. Mead (103, further literatiore ?Ierrick, 70) for having removed 

 these difficulties for the American lobster. 



150 



