Vaillant, Leon 



f 

 1880 Rapport svr les poissons., crustnces et nollusques. 



Exposition Universells Internationale c!e 1878, 



Groupe 8, classe 84, pp« 1-29. 



Report on fish, crustaceans and nollusks 



(p. 5) 



Crustaceans - The lobsters and langoustes (craT/fish) are the 

 only ones of these ani:iials who seem to be able to become the ob- 

 ject of practical rearing, the low price of the different species 

 of crabs v/hich are consvonec does not hardly perinit the hope that 

 tliey may be able to defray the expenditxjre of a less importarrfc 

 cultivation; as f or t he siirinps, their, small size, the quantity 

 of vmter and nourishment which is necessary may also be obstacles 

 to their rearingo 



The adult crustaceans offer great difficulties for the pre- 

 servation of their living state* Their feeding is very active; 

 they reqxiire, therefore, abundant nourishment to maintain then- 

 selves in good condition; they should, to tell the truth, obtain 

 it themselves; these animals are not particular in the choice of 

 foodj but their v>rater should be frequently rener:ed» If all these 

 conditions., especially the latter, are not fulfilled, these animals 

 may become thin and, their shells covered with mud and marine veg- 

 etation, they lose all their marketable values Also, usually, one 

 ought to hold only a s:.iall number of these animals at a time and 

 for the shortest period possible^ a serious disadvantage for the 

 fishermr,n v/ho is not able to choose the time favorable for the 

 sales HovTever, Me Halna of PVetay has succeeded in overcoming 

 these difficulties and in a reservoir, of v/hich a relief model 

 has teen shoVvT., he has been able to keep vfith a voltune of v/ater 

 about 4,800 cubic meters up to SO^OOO crustaceans at a time and 

 not have a mortality of more than leS to 2 per cent. The langoustes 

 have been able 'to be held captive for six months 'Tithout losing any 

 of their qtialities* This result has been brought about by a 

 cleverly ingeniovis system of partitions and sluice gates,, v;hich 

 dividing the reservoir, permit at each tide the establishment in 

 the latter of violent currents and various directions according 

 to the needs s 



With regard to the artificial reproduction of crustaceans, 

 for those which v:e have, the langoustes whose larvae of so 

 bizarre form live in the high seas, aquicultxire appears impractical 

 a priori; for lobsters, v/hich are not in the sane position^ a 

 model of the reservoir has been vrell shown in the llorwegian section 

 by the Society of Stavanger, which should concern itself, accord- 

 ing to its title, with the artificial reproduction nf t_h_e lob_£ter_, 

 but it has not been possible for us to obtain satisfactory infor- 

 mation en the use of this apparatus anci the results obtained* 



172 



