212 FISHES FOR THE MARINE AQUARIUM. 



in his surmise that the spawn of the cod was not 

 deposited along the bed of the sea, as was formerly 

 believed, but floats on the surface of the water during 

 the entire period of its development, which occupies 



Fig. 140. 



Codfish (Gadus morrhua), 



about sixteen days. In the Crystal Palace and Brighton 

 Aquaria this spawning has repeatedly taken place, 

 and many important investigations have there been 

 made in the embryology of the young fish. On 

 account of its great prolificness, it is one of our 

 commonest and best sources of fish-food, and it is 



