MARINE PISCICULTURE 321 



an extent as to provide a direct remedy for 

 over-fishing. 



All the success which has attended the artificial 

 culture of fresh-water fishes, or of anadromous 

 fishes,^ can hardly be urged as an argument for 

 the utility of the similar treatment of purely 

 marine species. The conditions in the two cases 

 are very different. Fishes in a river or lake have 

 a distribution which is extremely limited, when 

 compared with that of marine species, even of such 

 " semi-sedentary " forms as the plaice. And the 

 ova and fry of fresh- water fishes like the trout 

 or carp are, when compared with those of marine 

 fishes, easy to hatch and rear to maturity. The 

 large amount of food-yolk in these eggs, and 

 other properties which we do not understand, 

 greatly facilitate their culture. Then the plant- 

 ing and distribution of such fry can be controlled 

 with great ease. There can be no shadow of 

 doubt as to the success of trout-hatching and 

 distribution in this country, and still more of 

 carp-rearing as it has been practised in Germany. 

 In the latter country the art of carp-rearing 

 is perfectly understood, and a literature, both 

 philosophical and technical, exists with regard 

 to this subject.^ Pisciculture with regard to the 

 carp in Germany is quite an industry, just as 



1 Fishes like the salmon or shad, which migrate regularly from the 

 sea into rivers, and vice versa. 



2 See U.S. Fish Commission Report iox 1884 (1886), pp. 467-655. 



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