SoEie spe6inen 2«5 en. in length had already been artificially- 

 propagated by Saville Kent in 1883. 



Most attempts vrere successful in hatching the eggs but soon 

 a great mortr.lity i/^ould ensue and not a single one reianinso KoviT- 

 ... ever, just the hatching of the eggs leads no farther since in 

 . nature this is also done quite readily, the larvae energing not 

 simultaneously but at short intervals. The result is consequently 

 that the larvae do not occur in dense nasses as :.s the case r.^hen 

 great maibers are released after hfrbching artificially* This 

 _ .massing of larvae naturally leads to the attractio'n of animals of 

 ■ prey particularly fishc 



This method of hatching eggs and releasing the young larvae 

 has been practised vridely in Canada and the United States. Results, 

 in' the form of increased supplj^, did hovrever not materialize; in 

 fact, the supply diminished steadily. Cooperation from the side of 

 the fishermen also left much to be desired and as a result this 

 method is being abandoned -.tore and moreo 



In Zeeland also n\i::ierous fishermen and dealers interested 

 1;hbmselves in attempts to- aid larvae in passing the larvae stage* 

 In oyster beds 'particularly repeated experiments were made. Results 

 .hov;ever were without exception unfavorable which is not surprising 

 in vie\T of the fact that for a long time men of science also did not 

 succeed in surmounting the many difficulties. The question was not 

 so much the hatching of the eggs as the raising of the larvae. 



Of later years IfiTo Bolderbos, keeper of a lobster hatchery in 

 . Bergen-op-Zoom, has been occupied in a smrill way with the experi- 

 mental propagation of lobsters. A rubber hose entering at the side 

 and bcttom of a tube served to change the water and at the same 

 time created a v/hirling- motion, excess vratcr being permitted to 

 floT."- over the edge of the tube* According t -^ his reports results 

 v;ere quite good. The experiments were hov;ever not repeated in 

 1919 and 1920 so that I have not been able to observe the method 

 personally. 



The honor of having found a m.ethod of use for practical pur- 

 poses belongs to Dr. A. A« Head of Providence, Rhode Island. He 

 also had to overcome many diff ic'^lties during the fi'rst years and 

 he says: "In the cas-e of all fishes vrtiich v/e have attempted to 

 rear, the problem is easier .than in the ca.se of lobster." 



In 1901 a plant was built in Vfickford, Rliode Island to test 

 the system invented by Dr. Head. This system is nothing else than 

 . the application of the principle that the v/atcr in which the larvae 

 are to grovf is to be not ohljr changed regularly but, must also be 

 kept in' fairly strong motion'; so that: 



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