THE AMEBIC AN NATURALIST [Vol.XLIV 



plea for exact observation of the habits of fishes as against undue 

 generalization. 



Mr. L. F. Ayson discusses the introduction of American fishes 

 into New Zealand, an operation which has been thoroughly suc- 

 cessful. Most notable is the growth of the rainbow trout in the 

 lakes of the northern island. Anglers are restricted to thirty 

 pounds a day, and over twenty tons of trout have been taken 

 out of two small lakes at Rotorua in one season. The rainbow 

 trout is frequently taken from ten to twenty pounds or more 

 in weight. 



Mr. G. M. Dannevig discusses* the success of the Norwegians 

 in the planting of the fry of codfish in depleted waters. 



Three papers, by S. W. Downing, Prank X. (lark and Paul 

 Reighard, on the promotion of whitefish production in the Great 

 Lakes, are especially important and suggestive. It is shown that 

 with the adequate planting of whitefish eggs it would be possible 

 practically to capture all the adult fish, and the natural spawn- 

 ing of the fish could be made a matter of no importance. This 

 discussion looks forward to the time when the fishing season for 

 whitefish will be largely identical with the spawning season ; that 

 is, in November, when the eggs of each fish thus caught will be 

 preserved and hatched, and the young fish placed in the open 

 water of the lakes. The whitefish ground is greater in Lake 

 Erie than in any other of our American lakes. The plant of 

 whitefish fry in Lake Erie now approaches one billion young 

 fish per year, and, in spite of the enormous fishing taking place 

 in that lake, the number of whitefish is increasing. 



The following are the special recommendations of Mr. Reig- 

 hard, and these should receive the most careful consideration 

 from those interested: 



1. It is recommended, as a result of the foregoing study, that 

 the output of whitefish fry be increased as rapidly as possible, as 

 affording the most certain means of increasing the whitefish 



2. That an intensive plant of at least one hundred fry per 

 pound of whitefish caught be made on depleted areas. (Lake 

 Ontario and the southern waters of Lake Michigan are in need 

 of especial attention.) 



3. That a close season be observed durum- the breeding season 

 of the whitefish as at present, but only for such waters as are not 

 under federal control. 



