메기(Silurus asotus) 기아 시 조직학적 변화 = Effect of starvation on tissues in Far Eastern catfish(Silurus asotus)

국문 초록 (Abstract)

메기(Silurus asotus)의 기아 시 생존율, 생식소 중량지수(gonadosomatic index; GSI), 간 중량지수(hepatosomatic index; HSI) 및 장 중량지수(intestinosomatic index; ISI)와 신장세포, 장 상피세포 및 간세포의 조직학적 변화를 조사하였다. 생존율은 섭이군이 92.2±0.47%, 기아군이 74.4±2.59%를 보였으며, GSI, HSI 및 ISI는 기아군에서 가장 낮은 값을 나타내었다(p<0.05). 신장세포 핵의 높이, 장 상피세포 핵의 높이, 간세포 핵의 크기 및 간세포의 크기는 섭이군에서 가장 높은 값을 보였으며(p<0.05), 신장세포핵의 높이, 장 상피세포 핵의 높이 및 간세포 핵의 크기는 기아군에서 가장 낮은 값을 보였다(p>0.05). 멜라닌대식세포(melano-macrophages; MMs)는 기아 동안 신장에서 증가함을 관찰하였다. 신장의 MMs 증가 및 간세포의 수축현상은 메기의 기아 상태를 식별하는 지표로 이용할 수 있으며, 본 연구의 결과는 메기의 영양 상태 확인을 위한 기초 자료로서 의미가 있을 것으로 사료된다.

다국어 초록 (Multilingual Abstract)

A 210-day experiment was conducted to examine the effects of starvation on survival, the gonadosomatic index (GSI), hepatosomatic index (HSI), and the intestinosomatic index (ISI), and histological changes in the renal tubule epithelium, midgut epithelium, and hepatocytes in Far Eastern catfish (Silurus asotus). The survival rate decreased to 92.2±0.47% in the fed group and 74.4±2.59% in the starved group during the 210-day experimental period. GSI, HSI, and ISI were lowest in the starved group (p<0.05). The hepatocyte nuclear area, hepatocyte cell area, the nuclear height of the midgut epithelium, and the nuclear height of the kidney were highest in the fed group (p<0.05). The hepatocyte nuclear area, nuclear height of the midgut epithelium, and nuclear height of the kidney were lowest in the starved group(p<0.05). The numbers of melano-macrophages (MMs) found in the kidney cells increased during starvation in this species. This suggests that thinner body cavity regions, the contraction of hepatocyte nuclear sites, and the spreading of kidney cell MMs in this species could be used as alternative indicators for identifying starvation conditions. Therefore, the results from our study provide accurate indications of the nutritional status of Far Eastern catfish.

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