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KMID : 0380319750150000225
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Journal of Korean Research Institute for Better Living
1975 Volume.15 No. 0 p.225 ~ p.238
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INDOOR RAISING OF THE BULLFORG FOR BREEDING
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Abstract
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The lifecycle of the bullfrog covers a long period; 14 months for the tadpole to develop into a frog and three years for the frog to mature. In order shorten the growth period and stimulate the growth rate, the author carried out an experiment, feeding frogs raised in the field during the summer months and indoors in the winter.
The result was successful and it was found that the growth period could be cut by half; seven months for the tadpole to develop and two years for the frog to mature.
300 pyong(o.l.h) of ponds were prepared for outdoor raising in Yiwang Myon, Shihung Kun(4㎞ from Anyang) and two small rooms on Ewha campus, behind the Science Hall.
200 breeding frog were imported and placed in the ponds in Shihung and spawning commenced on July 9, 1972. 105 days later, many of the tadpoles grew to 100-125㎜. A hundred of them were collected and taken into the indoor raising room on October 29, 1972 and raised on lettuce, spinach, and loaches. Row lettuce were used and spinach and loaches were boiled before feeding the tadpoles.
Transformation began from December 14, 1972 and the body length of the young frog was 45㎜ and weighed 7g.
The following table shows the growth rate up to maturation:
Date Body length Body wieght
1972. 12. 15 45㎜ 7g
1973. 2. 10 75〃 56〃
5. 17 100〃 145〃
7. 14 130〃 295〃
10. 15 155〃 635〃
1974. 2. 15 160〃 656〃
3. 14 160〃 685〃
4. 15 160〃 757〃
6. 24 160〃 805〃
The matured females spawned for the third generation in the following places:
A. Jonjin Dairy Pond(near DMZ)
Date of placing the Seed Frog: May 20, 1974
Number of Frogs: Four females and four males
Date of spawning: Jun 18, 1974
B. Yongsan Pond(8th Army golf field)
Date of placing Seed Frog: June 4, 1974
Number of frogs: Two females and two males
Date of spawning: June 30, 1974
C. Sosa Pond(AmericanKorean Foundation Farm in Sosa)
Date of placing Seed Frogs: 24, 1974
Number of Frogs: Four females and four males
Date of spawning: July 13, 1974
At present there are many adults, young frogs, and tadpoles in Shihung ponds and only tadpoles are wintering in the above three places.
About 30 frogs are being fed indoors and some of them are expected to spawn in June, 1975.
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