18 REPORTS OF THE DEPARTMENT OF COMMERCE. 
MUSSEL PROPAGATION, FiscAL YEAR ENDED JUNE 30, 1918—PoiINnTs or DEposIt 
AND SPECIES OF GLOCHIDIA PLANTED. 
s New Bos- 
ap Fairport, | airport, -| ton, Mis- | Lake Black 
Decies. Pokegama Rive PP?|  sissippi Pepin. River. 
ayes River. 
Yellow sandshell (Lampsilis anodontoides) . . eeeee| 3,547,900 | 4,548, 000 
Mucket (Lampsilis ligamentina) .........--|-.-2-+-.-0-- 11, 758, 850 | 26,687, 400 |. 
Butterfly \(Plagiola Becuris)<-4<~ se tise = sane = |> «bees een 58; 800) (aches steeme : 
Lake Pepin mucket (Lampsilis luteola)....| 30,417,700 60, 000" (Ss state esse 
TL Otal .;. tt acomade secmourcass =e eeeenes 30, 417, 700 | 15, 410, 550 | 31,235,400 | 91,226,800 | 19, 296,500 
: Cumber- R 
: White Lake Ohio 
Species. ra land f Total. 
River Rives. Keokuk. River 
Yellow sandshell (Lampsilis anodontoides) . . 11, 000 15, 500 149, 200) |é.6) . seagate 8, 271, 600 
Mucket (Lampsilis ligamentina)......-.-.-- 1,797,000 | 2,338, 500 248,000 | 5,925,100 | 68, 051, 350 
Butterfly (Plagiola securis)........---.-.-2 DI8,(000)|. cos ceeses 34 O00 Fcc CCE 590, 
Lake Pepin mucket (Lampsilis luteola)....|..-...-.----|-cse-e+e-0-- 95.707 WO) nee a comme 131, 416, 600 
Black sandshell (Lampsilis recta)......-.-. SUES Oe aS ee FP UO Cope ee 5 137, 825 
Pocketbook (Lampsilis ventricosa).......-. 664,650 loc. ccc. ccdcaifcticee. ba leseeeeebecee €64, 650 
Tota! cot cose. Seis fet bape 3,105,975 | 2,354,000 | 10,160,800 | 5,925,100 | 209, 132, 825 
INVESTIGATIONS AND EXPERIMENTS REGARDING AQUATIC 
PRODUCTS. 
MODIFICATION OF THE SCIENTIFIC WORK. 
The conditions of war have necessarily led to marked modifications 
of the Bureau’s general plan of scientific work. Efforts have been 
devoted primarily to such studies or practical experiments as could 
be expected to contribute promptly to the increase of the supply of 
food or other useful aquatic products, but there has been no exclusion 
of biological and chemical investigations which have to do chiefly 
with our preparation for meeting the problems that will confront the 
Nation after the war. An outline of the scope of the chief investiga- 
tions and other work appropriately associated with the scientific in- 
quiries, and in some cases the actual results obtained, are briefly 
summarized. 
EXPERIMENTS RELATING TO THE PRESERVATION OF FISHERY PRODUCTS. 
An important phase of the Bureau’s scientific work is the solving 
of problems in the preservation of fishes for food. No more useful 
service for the prevention of waste and the promotion of the use of 
aquatic foods can be rendered than by ascertaining the conditions 
leading to spoilage of fresh and cured fish and by discovering more 
effective methods of preservation. Especially is it important to find 
means of treatment or of preservation which are suited to the fishes 
that can not be adequately utilized by old methods or are adapted to 
climatic or transportation conditions under which the common 
means of preservation fail of their purpose. : 
Principal among investigations of this character are the experi- 
ments in the preservation of fresh fishes by methods of desiccation. 
