994 BUtLETIN OF THE BUREAU OF FISHERIES. 



records of the nest. The nest number is stamped or painted on the upper half 

 of the face of the case; in the lower half is fixed a metal pointer, in a dial upon 

 which appear symbols which will indicate to the fish culturist whether the nest 

 is "cleaned up" or contains eggs or fry. A metal pocket is soldered upon the 

 back of the case, by means of which to fit it to the tall standard of the shield. 

 The especial advantages of this nest are as follows: 



1 . The shield can be removed to permit placing the retaining screen around 

 the nest without roiling the water or disturbing the nest proper, thereby avoiding 

 injury to the fry by the rolling of the gravel. 



2. The nest proper, remaining permanently in the pond, is always in readi- 

 ness for use without the expenditure of labor to renew each year, and when once 

 installed requires only attaching of the shield, which can be done in the space of 

 a moment. 



3. The nest, being of heavy metal, will remain stationary in the pond 

 without being weighted down to prevent floating. 



4. A separate and complete record of each nest can be kept as its product 

 advances to different stages, while its condition can be determined from the shore 

 at a glance without disturbing the fish by entering the water or going to the nest 

 in a boat. 



5. Nest and shield are easily stored. Fifty of the shields require a space 

 but 2 feet wide, 2 feet high, and 26 inches long. 



BASS FRY RETAINING SCREEN AND TRAP. 

 [Exhibit 2. Fig. 2, pi. civ.] 



The retaining screen and trap exhibited is intended for use in connection 

 with the bass nest just described. It combines with the ordinary cylindrical 

 retainer a device by means of which the fry are entrapped and may be readily 

 lifted from the nest. Certain improvements in the construction of the retainer 

 are also important features. 



The retaining screen is made of a piece of 14-mesh galvanized wire cloth 

 3 feet in width, stretched around a frame consisting of two iron hoops and 4 iron 

 standards. The hoops are made of ^ by i inch iron bands and are 3 feet in 

 diameter; the standards are 3 feet high. The joinings are everywhere made with 

 stove bolts, which also secure the wire cloth to the frame. At the seam the 

 wire cloth is lapped directly over one standard and an extra upright 3 yi. feet long 

 is bolted over the lap. The circular inclosure thus built is readily " knockdown " 

 for storage purposes. Upon the projecting upright is fitted the record holder, 

 which was attached to the nest shield described in exhibit i and is now to be 

 transferred to carry on the record for the fry. All metallic "parts are painted. 



The trap is within the retainer. It consists of a hoop fitted over the bottom 

 hoop of the retainer and securing about its circumference a piece of bobbinet 



