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KMID : 0900919920160020157
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Korean journal of Animal Reproduction
1992 Volume.16 No. 2 p.157 ~ p.164
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Effects of hCG on Sexual Maturation in Korean Loach
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Song G. C.
Yoon Jong-Man
Park Hong-Yang
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Abstract
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This stduy was carried out to obtain basic information available on ovulation, spawning, fertilization rate, hatching rate, and deformity rate after hCG injection in cyprinid loach, Misgurnus mizolepis. The results obtained in these experiments were as follows: 1. Ovulation and spawning occurred simultaneously and spawing was completed within 1 hour after ovulation. 2. More than 80% of fertilization rates appeared within 12 hours at 21^{circ}C, 8 hours at 25^{circ}C, and 4 hours at 29^{circ}C, respectively, following the onset of spawing. Afterwards, the fertilization rates of released eggs sharply decreased in three different water temperatures. 3. More than 70% of hatching rates appeared within 8 hours at 21^{circ}C, 6 hours at 25^{circ}C, and 2 hours at 29^{circ}C, respectively, following the onset of spawing. Afterwards, hatching rates of spawned eggs abruptly decreased in three different water temperatures. 4. The deformity rates of hatched larvae were high at 25^{circ}C, 8 hours following the onset of spawing. 5. Based on the developmental ability of oocytes, the optimum time of fertilization was 4 hours (stage 5) following the onset of spawing.
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KEYWORD
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hCG, maturation, spawing, ovulation, Korean loach
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