고리 주변 해역에 출현하는 반딧불게르치(Acropoma japonicum)의 생식생태
Reproductive ecology of the glowbelly, Acropoma japonicum (Perciformes: Acropomatidae) in the coastal waters off Gori, Korea
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초록
본 연구는 2006년 1월에서 12월까지 한국 동해 남부 고리주변해역에서 채집된 반딧불게르치 637개체의 생식생태를 조사하였다. 반딧불게르치 암컷은 표준체장 2.9～11.4 cm의 범위, 수컷은 2.7～10.5 cm의 범위를 보였다. 반딧불게르치 암컷의 생식소중량지수 (GSI)는 7월 이후 증가하기 시작하여 9월에 가장 높은 값을 보였고 12월까지 감소하는 양상을 나타내었다. 따라서 반딧불게르치의 산란기는 8월에서 11월로 추정되었다. 반딧불게르치 암․수간 월별 성비는 1:1에서 유의한 차이를 보이지 않았다 (x2test, p＞0.05). 반딧불게르치 암컷의 50% 군성숙체장은 6.0 cm로 추정되었다. 반딧불게르치는 산란기동안 1회 이상 산란하였고 최대 난경은 0.75 mm를 보였다. 포란수는 12,052～104,246개 평균 38,321개를 보였다. 포란수 (F)와 체장 (SL), 체중 (BW)과의 관계식은 각각 F = 86.278SL2.9652 (R2 = 0.7970), F = 3036BW1.0081 (R2 = 0.7992)로 나타났다.
Abstract
The reproductive ecology of the glowbelly, Acropoma japonicum was examined using 637 specimens collected monthly from January to December 2006 in the coastal waters off Gori, Korea. The specimens ranged in standard length (cm, SL) from 2.9 to 11.4 cm for female, 2.7 to 10.5 cm for male. The gonadosomatic index (GSI) of female was highest in September and decreased until December, and the spawning season lasted from August to November. The monthly sex was not different significantly (x2test, p＞0.05). The size at 50% maturity was estimated at 6.0 cm SL. A. japonicum was multiple spawner that spawn on more than one occasion in a single spawning season, and the maximum egg diameter was 0.85 mm. Fecundity (F) ranged from 12,052 to 104,246 eggs, with the mean of 38,321 eggs. The relationships between fecundity and standard length (cm, SL), body weight (g, BW) were estimated as F = 86.278SL2.9652 (R2 = 0.7970) and F = 3036BW1.0081 (R2 = 0.7992), respectively.
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