MARENZELLER PISCICULTURAL ESTABLISHMENT, ST. POLTEN. 655 



sides, quite near the edge. By introducing these improvements Mr. 

 Fruwirth prevents the little fish from coming within the immediate 

 reach of the strong current, and also keeps his gratings free from mud, 

 leaves, &c. 



The pretty hatching-house B lies about 3 feet deeper than the main 

 pond Si, and receives its water from this pond through two pipes. The 

 pipe, which is protected by one of the above-described cuuiforiri mud- 

 catchers, begins with a broad portion covered with flannel and perforated 

 like a sieve, leading into a filtering-box 9 feet long and 2 feet broad, 

 filled with alternate layers of sand and charcoal, which are separated 

 from each other by thin perforated boards and pieces of linen. From 

 this filtering-box the pipes branch off to the four Coste hatching appa- 

 ratus with 25 vessels each, which are inside the house. The number of 

 vessels in the hatching-house is therefore 100. Counting 5,000 eggs for 

 each one, we find that Mr. Fruwirth's hatching-house can accommodate 

 500,000 eggs. Besides these vessels I saw six Jacobi hatching-boxes 

 with 36 vessels, each capable of holding 2,000 eggs, so that 72,000 more 

 eggs can be accommodated. If all these vessels were filled to their ut- 

 most capacity, this establishment could develop more than a million of 

 eggs. After having left the eggs, the young fish go into two wooden 

 boxes placed in the ground on the outside of the hatching-house (on the 

 diagram it would be the south side). From each of these boxes a pipe 

 which can be closed (the two dotted lines) leads into the narrow and 

 shallow ditches marked j. These provide for the case that the young 

 fish gathered in the wooden boxes should be too numerous, and that 

 they could not immediately be placed in the "chambers for young fry," 

 which are to be described further on. The thick black line beginning 

 at the letter Z, in the pond S 2 , is a pipe, by which any amount of water 

 can be introduced if the influx from the hatching-house should not be 

 sufficient. Model order and neatness characterize the interior of the 

 hatching-house. All the necessary apparatus is found here in a suitable 

 selection. I must not forget to mention that there is a reservoir in the 

 floor of the hatching -house, from which water can be obtained by means 

 of a pump. We shall soon see for what purpose this reservoir has been 

 introduced. If we leave this cheerful house by way of its southern front 

 and go to the opposite side, a wooden stair-case invites us to the inspec- 

 tion of a superstructure rising from the middle portion of the hatching- 

 house. Here we find a small but admirably arranged laboratory. On 

 one wall we see several aquaria ranged in stories one above the other. 

 In the lowest and largest one young trout and saibling are sporting. 



By means of the above-mentioned pump in the hatching-house, a reser- 

 voir placed in the loft above this little room is filled with water, which 

 from here either flows direct into the aquaria or is used in putting in 

 motion some of SpengePs ventilating apparatus. The effect of this very 

 simple and cheap arrangement is excellent. The importance of these 

 large and small aquaria cannot be overrated. In the first place, the 



