인공사육에 의한 멸종위기종 꼬치동자개(Pseudobagrus brevicorpus)의 성장과 성성숙 특성
Characteristics on Growth and Sexual Maturation of an Endangered Fish, Stumpy Bullhead (Pseudobagrus brevicorpus), from Korea by Artificial Rearing
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Abstract
The stumpy bullhead (Pseudobagrus brevicorpus) endemic to Korea is one of critically endangered freshwater fish species. To provide baseline data for its captive breeding and reintroduction we investigated basal characteristics on its growth and sexual maturation in an artificial rearing environment. After 698-day rearing the stumpy bullhead grew up to 89.22±10.29 mm in total length (TL) and 70.93±7.68 g in total body weight (BW)(BW=5×10-5 TL2.678; R2=0.995), and showed survival rate of 74.2%. The sex ratio was 1 (471 females) : 1 (473 males), and males (TL= 87.44±1.07mm; BW=8.43±0.31 g) showed significantly faster growth than females (TL=78.38 ±0.92mm; BW=6.38±0.20 g) after 663-day rearing. However, condition factor of females was significantly higher than that of males (P<0.05). The number of eggs per female ranged from 508 to 867 (average 734), and their diameters ranged from 0.04 to 1.65 mm. The females which reared about two years in the laboratory condition was able to spawn in the early June after 1~2 days of human chorionic gonadotropin (HCG) injection. The number of hatched fries ranged from 113 to 338 (average 216).
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