Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Annual Reproductive Cycle and Sexual Characteristics of Horsehead Branchiostegus japonicus

옥돔 Branchiostegus japonicus의 생식주기와 성 특성

Choe, Jeong-Gwon;Kim, Han-Jun;Park, Chang-Beom;Lee, Chi-Hun;Song, Yeong-Bo;Lee, Gyeong-Jun;Yeo, In-Gyu;Lee, Jeong-Ui;Jang, Dae-Su;Ha, Dong-Su;Lee, Yeong-Don
최정권;김한준;박창범;이치훈;송영보;이경준;여인규;이정의;장대수;하동수;이영돈

  • Published : 20040000
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Abstract

Oocyte development and patterns of sex differentiation in female Horsehead Branchiostegus japonicus in Jeju costal water were investigated, to understand reproductive cycle sexual characteristic. The gonadosomatic index (GSI) was increased in June and reached its maximum in October. Developmental changes of the ovary were correlated with the pattern of GSI. On the basis of histological observation, the oocytes were classified into the following nine stages; chromatin-nucleolus, peri-nucleolus, oil-droplet, yolk vesicle, primary yolk, secondary yolk, tertiary yolk, migratory nucleus, and ripe stages. The oocytes in yolk stage were observed from October to December. After January, the ovaries were composed of the chromatin-nucleolus and peri-nucleolus oocytes. Therefore, the reproductive cycle of the horsehead could be divided into the following successive stages; growing (July), mature (September), ripe and spawning (from October to November) and resting and recovery stage (from December to June). Major spawning period was October. Based on the oocyte development pattern, the horsehead was considered as an asynchronous type in oocyte development. This species was considered to spawn over two times during the spawning period. The process of sexual characteristic from undifferentiated stages to ovary and testis was classified into four types. Gonad of female was of female containing oocytes and ovarian cavity without spermatogenic tissue. Gonads of superior female intersex (SFI) mostly composed of previtellogenic and vitellogenic oocytes, and the periphery of the lamella contained several spermatogenic tissues. Gonads of superior male intersex (SMI) mostly contained spermatocytes formed within cysts and several previtellogenic oocytes, but were not composed of the ovarian cavity. Testis of male was filled with active spermatogenesis, but contained no oocytes. The total length for sex distribution in female, SFI, SMI, and male were 12.0~39.9 cm, 19.0~39.9 cm, 19.0~39.9 cm, and 25.0~42.9 cm, respectively. These results suggest that type of sex differentiation in B. japonicus might be undifferentiatwd gonochorism.

제주 연근해산 옥돔 B. japonicus의 생식주기와 성 특징을 파악하기 위하여 생식소중량지수, 난모세포 발달과 성 분화 양상에 관하여 조직학적으로 조사하였다. 1. 생식소중량지수는 1997년 1월부터 1999년 12월까지 유사한 양상을 보였으며 9~10월에는 1.50 이상의 높은 값을 보인 후 11월에 들어서면서 다시 0.50 이하로 급격히 낮아졌다. 2. 난 형성 과정은 난모세포의 형태학적 특징과 염색성, 난황축적 상태, 여포세포의 발달, 핵 이동 등 조직학적 관찰에 의해 다음의 9단계로 나누었다 염색인기, 주변인기, 유구기, 난황포기, 1차 난황구기, 2차 난황구기, 3차 난황구기, 핵 이동기 그리고 완숙기로 구분하였다. 3. 암컷의 생식주기는 난소 내 난모세포의 발달단계를 기초로 하여 성장기 (7월), 성숙기 (9월), 완숙 및 산란(10~11월), 휴지 및 회복기(12~6월)로 구분되었다. 주산란 시기는 10월이고 난 발달 양식은 난군 비동기 발달형으로서 산란시기에 2회 이상 산란하는 것으로 추정된다. 4. SMI는 정모세포들이 생식소 내에 대부분을 차지하였고 소수의 난모세포들이 혼재하였다. 5. SFI는 난소의 형태를 가지며 생식소 내에 난모세포들이 대부분 차지하였고, 소수의 정원세포 무리와 정모세포 무리들이 혼재하였다. 6. 총 628마리 중 362마리 (57.7%)가 암컷, 63마리(10.0%)가 수컷이었고 간성개체는 203 (32.3%)마리였다. 간성개체 중 SMI는 103마리 (16.4%), SFI는 100마리(15.9%)였다. 조사한 옥돔의 전장은 12.7~41.5 cm 범위였다. 전장에 따른 성의 분포에서, 암컷은 12.0~33.9 cm (99.0%)에서 주로 분포하였고, 수컷은 전장 25.0 cm 이상에서 출현하였다. SMI는 전장 12.0~15.9 cm와 22.0~36.9 cm(98.1%) 범위, 그리고 SFI는 전장 19.0~ 33.9cm (97.0%) 범위에서 주로 분포하였다. 7. 이들의 결과에서 옥돔의 성현상은 난소에서 정소로 성 전환하는 2차 수컷을 찾아볼 수 없어 미분화형 자웅이체로 생각되나, 앞으로 완전 사육 과정을 탐색하여 성체제에 대한 심도 있는 연구가 요구된다.

Keywords

References

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