304 BULLETIN OF THE UNITED STATES FISH COMMISSION. 



dike. This may usually be avoided by constructing the outflow in the 

 following way : In the middle of the dike, where the outflow goes 

 through, a partition wall should be built of good oak jjlank, as shown 

 in the sketch. 



A is a box of 2-inch oak plank, about 8 or 10 inches square, and long 

 enough to j)ass underneath the dike. B is the overflow. 



G is the opening for draining the pond, while T> is a board acting as 

 a lever to open and close C. This lever must work very easily. 



B is a screw-bolt fastened below. 



r is a little board f -inch thick, suflficient to cover the opening C. 



G is another screw-bolt similar to E. When the lever is in perpen- 

 dicular position, the bolt is put through and the nut screwed on, making 

 the opening water-tight. 



CoLUiviBiA, III., October 18, 1886. 



97.-AIUERICAIV FISH IIV TSEW ZEAL,AIVI>.* 



The authorities of New Zealand have sent to America for the ova of 

 the landlocked salmon, the rainbow or California trout, the whitefish, 

 and a fresh stock of the brook trout. The rainbow trout {Salmo irideus) 

 will probably be an exceedingly valuable addition to the salmonoids in 

 the waters of New Zealand, as it endures a high temperature, is not de- 

 structive to its own kind, is a splendid food-fish, and afl"ords good sport. 



During 1880 and 1881 about 770 of the American brook trout {Sal- 

 velinus fontinalis) were distributed among three of the rivers of New 

 Zealand. No result has yet been reported from these ; but the adult 

 fish in the care of the Acclimatization Society have done remarkably 

 well and i^roduced a large quantity of ova, which, in spite of several 

 mishaps, has resulted in about 2,500 fry being jilaced in a race. It is 

 intended to keep the most of these fry until they are yearlings, and 

 thus replenish the stock of parent fish. 



A number of the American catfish {Amiurus catus) were originally 

 imported into Auckland from America in 1879; and they are now abun- 

 dant in St. John's Lake and other waters. During last year Captain 

 Fairchild brought a few to Dr. Hector, who liberated 30 in Mr. Percy's 

 pond at Petone. They are said to be a harmless fish, of fair ediUle 

 qualities, growing to a large size in waters unsuitable for Salmonidce, and 

 easy of capture. 



Since 1875 nearly 10,000 fry of the California salmon [Salmo quinnat) 

 have been distributed to such localities about the islands as seemed 

 most suitable for the acclimatization and growth of this siiecies. 



Large shipments of the Atlantic salmon {Salmo salar) have been ob- 

 tained from England, especially from the Tweed ; and since the last 

 annual meeting 19,400 fry have been hatched and liberated. 



* Extracted from the aunual report of the Wellington and Wairarapa Acclimatiza- 

 tion Society, September, 1886. 



