138 DISTRIBUTION OF FISH AND FISH EGGS, 1915. 
FRESH-WATER MUSSEL PROPAGATION. 
The propagation of fresh-water pearl mussels is pursued in con- 
nection with the Fairport, Iowa, Biological Station, with field parties 
working in several places in thie Mississippi Basin. 
A steady increase in the number of mussels distributed has marked 
the progress of the work since the begining of the practical opera- 
tions five years ago. During the fiscal year 1915, 344,655,260 glo- 
chidia, or larval mussels, were planted in the public waters, repre- 
senting an increase of about 50 per cent over the oe of the pre- 
ceding year. 
Incidental to these operations 207,919 fish were ised, of which 
47,733 fishes were rescued from landlocked ponds in the Grerlowed 
lands and returned to the rivers. More than two-thirds of the 
fishes rescued in these operations were adult food fishes. 
The following table gives the number of each species of mussel 
planted, and the locality in which the fish infected with them were 
planted: 
MussEL PrRopaGAaTion, FrscAn YEAR ENpiInG JuNE 30, 1915. 
Points of deposit and species of glochidia used for infection. 
Black White 
Mississippi] Lake Web River, River, 
Species. River, Fair-| Pepin, eiticewned Black Newport Total. 
port, Lowa. Minn. img” Rock, Ark.,| Ark.,an 
: and south. | vicinity. 
Foaket boos (Lampsilis ventri- 
80) = fone Reon et amamee esos 6; 206, 300)|/ 22701, (008 -aacan se sb4|eseseetecees | seeeser ae ee 8, 908, 000 
Mucket (Lampsilis ligamen- 
UNE e ssl reece cece ieee {11,6432 100) |Seee ee eee 9,475,000 | 26,175,500 | 25,333,300 | 172,626, 900 
Lake Pepin mucket (Lamp- 
NILES LUTCOLD) sericea eee ees 1062: 000 311375104540 00 hee oe eee eee Boe ooeaiseeere 138, 256, 400 
Black sand-shell (Lampsilis 
TECUL) Lx. sete se eee ae ee 1732552900) oo ssn ddca| tiene nee cee now se ete oe | peeser eae 17, 255, 900 
Yellow sand-shell (Lampsilis 
ONUCONOIMES) ees eae SETGS S00" c= vee eee ate nee 592, 800 743, 800 5, 099, 960 
Btttterfly (Piaziele securis) . 32.0\' 2,436,600) | ere acl cece Sarena eaecer | eee ee et eee 2, 436, 600 
apie back (Quadrula pustu- 
LOS ao 2 2 SERRE Se ee vee SD BOO! pee ccd icra ee ce nee een eae ce | 71,500 
otal civ. ee 142, 438, 760 |139, 896,100 | 9, 475,000 | 26, 768,300 | 26,077, 100 | 344, 655, 260 
