BY THOMAS L. BANCROFT, M.E., EDIN. 255 



" Grunter." Therapon percoides and other fish ; some 

 few being hidden in the weeds, escape detection ; I believe 

 in thick masses of Hydrilla they have the best chance. 

 On Nitella beds, the ova that sink deep perish owing to 

 the lower portion of the Xitella being in a state of 

 decomposition ; the eggs that reach the sand or mud also 

 die, probably from this being loul. The eggs that get 

 tangled np in the green weeds and not exposed to too 

 much light develop in about a month ; the larvrP of 

 insects seem not to injure them but are attracted by the 

 young fish directly it emerges. 



A dredging net made of mosquito net on a stout ring 

 of iron is serviceable in scooping through the weeds in 

 search of ova : the ova must be kept cool and in the 

 dark ; they are very easily killed ; only a few obtained 

 in this rough way develop. It is absolutely necessary 

 to keep the newly hatched fish in the dark for a week at 

 least. 



Control experiments with the ova of the common 

 Cat-fish, Tandanus tandanus, were very successful under 

 the conditions that seemed the reverse for Ceratodus ; a 

 young Tandanus might be likened to the chick of the 

 common fowl and Ceratodus to a young pigeon. 



One experienced in rearing trout would be required 

 To attend to che hatchery. 



