I5O0 



FISH CULTURE 



FISH 

 CULTURE. 



1108 Investigations on the Number of Eggs Produced by Certain Fish. — mart, h., 



in 1// .emcii:c Fischerci-ZciH'.n,, Year Xlyl. No. 16, pp. 25S--^)o. Munich, August, 15, 191G. 



Very little is known with regard to the exact number of eggs prodticed 

 by various species of fish ; hitherto only rough estimates have been made 

 or where experiments have been carried out, the females have not been of 

 the same age. At the Bavarian trout hatchery (Starnberg), 58 common trout 

 {Tmtta jario) and 54 rainbow trout [Trutta iridea) were stripped and the 

 ova were carefully counted with results given in Tables I and II. 



It would appear that the heavier, i. e. the older, the fish the greater 

 the number of eggs produced ; but if the results are considered from* the 

 point of view of production per unit weight, the young fish yield a relative- 

 1}^ larger number of eggs, though the eggs are not so heavy. In other 

 words with a given quantity of matter young fish form a larger number of 

 eggs than do older fish. 



As these results could be questioned on the grounds that some of the 

 fish might have been incompletely stripped or that the fish might have 



Table I. — Number of eggs produced by common trout. 



Table II. — Number of eggs produced by rainbow trout. 



