producers, "but carp was raised in all prefectures excepting in northern 
Honshu and Hokkaido where it is too cold for this species. 
TABLE 17 
Humber of Carp Hearing Hatcheries 
Prefecture 
Number of Butcheries 
Miyazaki 
Niigata 
Gifu 
Akita 
Shiga 
Shizuoka 
Yamagata 
260 
240 
185 
165 
135 
75 
50 
Source: Japan 1 s Fisheries Industry 1939 (Special 
issue of Japan Times and Mail, 1939). 
In raising carp in rice fields young fish about two centimeters 
long were liberated about the end of June (shortly after rice planting) 
and were 10 - 15 centimeters long when gathered at the end of September 
(just prior to the removal of water from the paddy fields). Two-year 
old carp about 15 centimeters long and 100 grams in weight when liberated 
grew to about 32 centimeters and 500 grams by late September. Although 
the fish fed mainly on natural feed (chiefly water fleas) some prepared 
feed (silkworm chrysalises) was generally provided. 
Carp were reared in ponds by two methods — calm water and running 
water, of which the latter conducted most extensively in Gumma Prefecture 
was considered somewhat better. 
Among the larger lakes in which carp were raised were Lake Kasumi- 
gaura, Lake Sbofefc, Lake Chuzenji and Lake Biwa (at the southern end where 
the water is sufficiently warm). 
• 74 - 
16 001 P98 
