[27] 



FISH CULTURE IN CENTRAL EUROPE. 



565 



I think that the attempt to fecuudate, for instance, salmon eggs 

 with milt of the trout, should not remain the only one, and that, besides 

 endeavoring to find out whether the mixing of the sexual products of 

 these two kinds of fish will result in successful fecundation, fisk-cultur- 

 ists should also endeavor to utilize in some way eggs, which through 

 the possible failure of the male fish, would run the risk of being lost. 



It is said that the hybrid of the salmon and the trout does not migrate 

 to the sea; and in this respect it resembles the" Winter Salm," with 

 which it also shares the physiological characteristics of being barren. 

 Haack, however, asserts that the barrenness of the hybrid of the Salve- 

 linus umbla (male) and the trout (female) can not be proved. At Ber- 

 neuchen hybrids were obtained from the Salmo fontinalis and the trout. 

 Dr. Asper, of Zurich, has no very high opinion of these hybrids, which 

 generally have a small head, an irregular dorsal profile and ovary. At 

 Dachsen a great mortality has been observed among the young bastards 

 of the salmon and trout, whose umbilical bag has the bluish color of 

 algse. 



In the following table are given the kinds of salmon cultivated in the 

 various establishments : 



Name. 



Locality of establishment. 



Salmo salar 



Salmo quinnat..'. 



Salmo sebago 



Salmo fario 



Salmo lacnstria 



Salmo carpio 



Salmo irideus 



Salmo umbla 



Salmo fontinalis 



Thymallus vexillifer , 



Coregonus fera 



Coregonus wartnianni 



Coregonus maraena 



Coregonus albus 



Osmerus eperlanns 



Trout cf Salmon ? 



Salvelinns d Trout $ 



Trout cf Salmo fontinalis $ 



Zurich, Dachsen, Neubausen, Hiiningen, Selzenhof, Cosman- 

 doif, Velp, and Apeldoorn. 



Apoldoorn. 



Seewiese. 



Zurich, Dachsen, Neuhausen, Hiiningen, Selzenhof, Seewiese, 

 Cosmandorf",Berneuchen, Michaelstein.Velp.and Apeldoorn. 



Selzenhof and Apeldoorn. 



Radolfszell. 



Hiiningen, Liibbinchen, and Michaelatein. 



Hiiningen, Selzenhof, Radolsfzell, Wilthen, Liibbinchen, Eer- 

 neiichen, and Michaelstein. 



Hiiningen, Seewiese, Berneuchen, Velp, and Apeldoorn. 



Zurich, Dachsen, Neubausen, Hiiningen, Selzenhof, Radolfs- 

 zell, and Seewiese. 



Berneuchen. 



Zurich, Hiiningen, Selzenhof, Radolfszell, Liibbinchen, and 

 Berneuchen. 



Liibbinchen and Berneuchen. 



Liibbinchen and Berneuchen. 



Zurich and Liibbinchen. 



Dachsen, Neuhausen, Seewiese, and Cosmandorf. 



Hiiningen and Seewiese 



Berneuchen. 



II.— Cyprinus culture. 



Carp.— The, principal object of cyprinus culture is the carp, Cyprinus 

 carpio, which iii Central Europe has from time immemorial given rise to 

 a very lucrative trade. The great ease with which it is multiplied, 

 raised, and protected against its enemies, its prolific nature, the pref- 

 erence which it shows for vegetable food, and its rapid growth, explain 

 the great favor which this fish has found with fish-calturists, and may 

 even justify the expectation that its cultivation may also be extended 

 to Italy, although we are not inclined to consider the carp a remark- 

 able delicacy. 



