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해산송사리, Oryzias dancena의 산란행동 분석
임상구 ( Sang Gu Lim ),한형균 ( Hyung Kyun Han ),김광석 ( Kwang Seog Kim ),김봉석 ( Bong Seok Kim ),백현민 ( Hyun Min Baek ),박인석 ( In Seok Park ),길현우 ( Hyun Woo Gil ) 한국어류학회 2012 韓國魚類學會誌 Vol.24 No.3
본 연구는 해산송사리, Oryzias dancena의 산란행위를 분석하여 인공산란 기술 개발에 그 목적이 있 다. 실험 사육수조에서 관찰한 결과, 실험 시작 후 모든 수컷이 각자 목표로 한 암컷을 쫓아감과 동시에, 상대적으로 큰 수컷이 작은 수컷의 생식공을 공격하여 축출하는 행동(biting, expelling)을 보였다. 이후, 수컷은 암컷과 나란히 유영하며 구애행동을 보였으며, 뒷지느러미와 등지느러미를 이용해 암컷의 어체를 감싸고 방란 및 방정 한 결과, 수정난은 암컷의 생식공 부근에 부착되어 있었다. 수컷이 covering 하는 동안 암컷이 재빨리 앞으로 유 영하는 행동을 많은 빈도로 관찰하였는바, 이는 암컷이 수컷의 구애행동을 거절하는 경우라고 사료된다. 총 빈 도 81%의 산란행동 요인 2가지를 분석한 결과(P/0.05), 요인 1 (biting, expelling)은 암컷을 차지하기 위한 수 컷의 방어 행동으로 총 빈도의 23.1%였으며(P/0.05), 요인 2 (chasing, parallel swimming, covering, reject)는 산란을 위한 행동으로 총 빈도의 59.7%를 차지하였다(P/0.05). 본 결과는 해산송사리 종 보존의 기본적 생물학 적 자료 제공과 아울러 인공산란 기법에 유용한 자료로 쓰일 것이다. The aim of this study is to observe the reproductive behavior of the marine medaka, Oryzias dancena, and determine the factors of reproductive behavior to provide useful information for improving their artificial reproduction techniques. The reproductive behavior of the marine medaka was observed in laboratory aquaria. Once the experiment began, all of the males chased the females. The males attempted to stimulate the urogenital openings of the females. While chasing a female, a large male would bite a relatively small male``s anus. Larger males expelled smaller males with biting, and the defeated males were barred from the female. After the other males were expelled, the remaining male approached and drew alongside the female. The male``s dorsal and anal fins covered the female``s body. Spawning began after complete covering took place. Spawning of males and females occurred simultaneously. The loadings for 2 factors were calculated. The calculation was restricted to 2 factors because these 2 factors explained about 81% of the total common variance (P/0.05) and the following factors possessed no practical significance. Two movements (biting, expelling) had high positive values for factor one. This factor related a male``s defensive behavior to courtship behavior and spawning, and explained 23.1% of the total common variance (P/0.05). The second factor had high positive values for chasing, rejection, covering, and parallel swimming. This factor related a male``s courtship behavior and female``s defensive behavior to spawning, and explained 59.7% of the total common variance (P/ 0.05). This research provided basic biological data for the conservation of this species and useful information for improving their artificial reproduction techniques.
염분변화에 따른 붉바리(Epinephelus akaara)와 대왕붉바리 (E. bruneus ♀×E. lanceolatus ♂)의 성장, 생존 및 스트레스 반응
임상구 ( Sang Gu Lim ),한상범 ( Sang Bum Han ),임한규 ( Han Kyu Lim ) 한국수산과학회(구 한국수산학회) 2016 한국수산과학회지 Vol.49 No.5
In this study, we crossbred Epinephelus akaara and E. lanceolatus to produce a hybrid grouper with faster growth and adaptation to domestic aquaculture environments. The plasma cortisol and glucose levels and osmoregulation (stress response indicators) of the hybrid grouper, E. akaara ♀ × E. lanceolatus ♂, were investigated under several salinity levels (32, 24, 16, and 8 psu). The body lengths and weights of E. akaara (8.2 ± 0.1 cm, 8.3 ± 0.4 g) and the hybrid (8.6 ± 0.1 cm, 10.0 ± 0.4 g) were similar at the start of the experiment, but were significantly different at the end of the experiment. Juveniles of both E. akaara and the hybrid showed greater weight gain, specific growth, and feed conversion rate (FCR) under low salinity of 16 psu. Under the 8 psu treatment, the juvenile E. akaara all died, while the hybrid juveniles survived. Plasma cortisol levels were not affected by lower salinity in both species. The above results indicate that the hybrid is more tolerant of low salinity than is E. akaara, although both species exhibited higher growth and FCR at 16 psu, lower than the salinity of natural seawater. Thus, juveniles of both E. akaara and the hybrid can be more effectively cultured in brackish areas or waters with salinity lower than that of seawater.
메기( Silurus asotus)용 실험 배합사료와 상품사료의 사육효능 비교
임상구 ( Sang Gu Lim ),김광석 ( Kwang Seog Kim ),강용진 ( Yong Jin Kang ),김응오 ( Eung Oh Kim ),손맹현 ( Maeng Hyun Son ),안철민 ( Cheul Min An ),김강웅 ( Kang Woong Kim ),조용철 ( Yong Chul Cho ),김경덕 ( Kyoung Duck Kim ) 한국수산과학회 2012 한국수산과학회지 Vol.45 No.2
Two feeding trials were conducted to evaluate the effects of experimental extruded pellets (EEPs) and commercial EPs (CEPs) on Far Eastern catfish Silurus asotus in pilot- (experiment I) and commercial-scale (experiment II) tanks. Four diets were prepared: three EEPs (EEP1, EEP2 and EEP3) that contained different amounts of tuna fish meal, soybean meal, and squid liver oil, and one CEP diet. In experiment I, three replicate groups of juveniles were fed one of the four EPs in pilot-scale tanks for 19 weeks. The weight gains (WGs) of fish fed EEP1 and CEP were significantly higher than those of fish fed EEP2 or EEP3. The highest feed efficiency (FE) was observed in fish fed the CEP diet (P<0.05), and the FE of fish fed EEP1 and EEP3 were significantly higher than that with EEP2 (P<0.05). In experiment II, juveniles were fed one of four EPs in commercial-scale tanks for 19 weeks. WG and FE values of fish fed EEP1 and CEP were higher than those of fish fed EEP2 and EEP3. The results of this study indicate that the dietary formulation used in EEP1 could be used as a practical feed for Far Eastern catfish.