• 한국양식학회:학술대회논문집
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• 한국양식학회 2003년도 추계학술발표대회 논문요약집
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• pp.93-94
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• 2003

To investigate the food organisms of the Acentrogobius elongata during the juveniles stage, the stomach contents of fish, captured in the intertidal zone of Chungchongnam-do Sochon-gun Su-myon Dodun-ri between on early in June from the end of May 2000, were observed. Total length of the fingerings of A. elongata was 1.0~3.0cm size, and the participation rate of feeding was 68.6%. Main food organisms were such as copepods, shrimp larvae, polychaete larvae, and these occupied more than dry weight 4%. Copepods among them dominated the most quantitys by average 64.6%, and food organismsms appeared by order of polychaete larvae and shrimp larvae etc.. Therefore, most important food organisms of fingerlings stage of A. elongata were copepods, polychaete larvae, shrimp larvae etc.

• 한국어업기술학회:학술대회논문집
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• 한국어업기술학회 2002년도 춘계 수산관련학회 공둥학술발표회
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• pp.359-360
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• 2002

To investigate the food organisms of the Tridentiger trigonocephalus during the juveniles stage, the stomach contents of fish, captured in the intertidal zone of Chungchongnam-do Sochon-gun Su-myon Dodun-ri between on early June from end if may 1999, were observed. Total length of the juveniles of T. trigonocephalus was 5.5mm∼9.0mm size, and the participation rate of feeding was 68.5%. Main food organisms were such as copepods, amphipods, shrimp larvae, polychaete larvae, and these occupied more than dry weight 2%. Copepods among them dominated the most quantitys by average 67.5%, and next, food organismsms appeared much by order of polychaete larvae and shrimp larvae etc.. Therefore, most important food organisms of juvenile stage of T. trigonocephalus were copepods, polychaete larvae, shrimp larvae etc.

• 한국양식학회:학술대회논문집
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• 한국양식학회 2002년도 춘계 한국양식학회 학술대회 발표요지
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• pp.225-226
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• 2002

To investigate the food organisms of the Tridentiger trigonocephalus during the juveniles stage, the stomach contents of fish, captured in the intertidal zone of Chungchongnam-do Sochon-gun Su-myon Dodun-ri getween on early June from end of May 1999, were observed. Total length of the juveniles of T. trigonocephalus was 5.5mm∼9.0mm size, and the participation rate of feeding was 68.5%. Main food organisms were such as copepods, shrimp larvae, polychaete larvae, and these occupied more than dry weight 2%. Copepods among them dominated the most quantitys by average 67.5%, and next, food organismsms appeared much by order of polychaete larvae and shrimp larvae etc.. Therefore, most important food organisms of juvenile stage of T. trigonocephalus were copepods, polychaete larvae, shrimp larvae etc.

• 한국어업기술학회:학술대회논문집
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• 한국어업기술학회 2001년도 춘계 수산관련학회 공동학술대회발표요지집
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• pp.565-566
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• 2001

To investigate the food organisms of the Chasmichthys dolichognathus during the juveniles stage, the stomach contents of fish, captured in the intertidal zone of Chungchongnam-do Sochon-gun Su-myon Dodun-ri between on early June from end of May 1998, were observed. Total length of the juveniles of C. dolichognathus was 6.5mm ∼10.0mm size, and the participation rate of feeding was 67.7％. Main food organisms were such as copepods, amphipods, shrimp larvae, polychaete larvae, and these occupied more than dry weight 2％. Copepods among them dominated the most quantitys by avergage 65.5％, and next, food organismsms appeared much by order of polychaete larvae and shrimp larvae etc. Therefore, most important food organisms of juvenile stage of C. dolichognathus were copepods, polychaete larvae, shrimp larvae etc.

• 한국수산과학회지
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• 제47권5호
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• pp.562-566
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• 2014

Larvae of pandalid shrimp Pandalopsis japonica are benthic, and may prefer bottom to planktonic food items. Three diets, enriched Artemia meta-nauplii (AR), clam meat (CM), and crumbled shrimp (CD), were evaluated as food for early larvae in terms of biometric growth R:D ratios. Larvae fed AR and CM had significantly greater total length and dry weight than did larvae fed CD (P<0.05). Survival was significantly greater in larvae fed CM than in those fed AR and CD (P<0.05). R:D ratios were also significantly higher in larvae fed AR and CM than in those fed CD (P<0.05). Planktonic Artemia meta-nauplii containing high levels of fatty acids and amino acids were not suitable for either normal somatic growth or survival at early benthic larval stages. Furthermore, it is necessary to determine the optimal feeding duration to increase digestibility of AD. Thus, we propose that clam meat is the best diet for pandalid shrimp larvae.

• 수산해양교육연구
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• 제28권1호
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• pp.180-185
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• 2016

두줄망둑 자치어기의 먹이생물을 조사하기 위하여 2012년 5월말부터 6월초 사이에 충남 서천군 서면 도둔리의 조간대에서 채집된 두줄망둑의 위내용물을 조사하였다. 섭식참여율은 낮 동안에 오전과 오후에 각각 한 차례씩 증가하는 경향을 보였다. 두줄망둑의 자치어의 주요 먹이생물은 copepods, amphipods, shrimp larvae, polychaete larvae 등이었으며, 이들이 건중량의 2% 이상을 차지하였다. 그중에서 copepods가 평균 65.5%로 가장 많은 양을 차지하였고, polychaete larvae, shrimp larvae 등의 순으로 많이 출현하였다. 먹이생물의 개체수 조성비를 보면, copepods가 65.4%를 차지하여 가장 높았고, polychaete larvae는 22.6%, shrimp larvae는 14.5%를 차지하였다. 먹이생물 중 copepods는 개체수 조성비가 높고 출현율도 높아서, IRI가 5,369.3으로 가장 높은 수치를 나타내었고, polychaete larvae는 653.1, shrimp larvae는 287.1의 수치를 나타내었다. 따라서 두줄망둑의 자치어기의 가장 중요한 먹이생물은 copepods, polychaete larvae, shrimp larvae 등이었다.

• Fisheries and Aquatic Sciences
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• 제25권10호
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• pp.525-536
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• 2022

Photosynthetic bacteria (PSB) attract considerable interest as useful microorganisms; nevertheless, a generalized culture technique has not been previously reported owing to difficulty in their cultivation. Therefore, a simple culture technique suitable for public use was investigated. Among the PSB tested, the strain Rhodobacter azotoformans EBN-7 was the most suitable for scale-up production because it showed the highest specific growth rate (0.20 h^-1) on basal medium. In scale-up cultivation (500 L), R. azotoformans EBN-7 showed 4.50 × 10¹⁰ colony-forming units mL^-1 (number of viable cells), dry cell weight of 26.8 g/L, and a specific growth rate of 0.15 h^-1. Cultivation using this final culture broth (as seed culture) in a 15 L simple reactor was successful, with maintenance of cell activity evident. For use as seed culture, the maximum allowable preservation period of R. azotoformans EBN-7 at 4℃ was 3 months. When R. azotoformans EBN-7 cultivated in a simple technique was applied to shrimp aquaculture water, NH₄⁺-N was reduced from 0.61 mg/L to 0.24 mg/L (by 60.7%) in 4 days in comparison with the control. Thus, this simple culture technique using R. azotoformans EBN-7 has the potential for a good removal efficiency of NH₄⁺-N, making seed culture easier and suitable for public use.

• 한국수산과학회지
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• 제44권3호
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• pp.284-289
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• 2011

The feeding habits of the blackthroat seaperch Doederleinia berycoides were studied using 650 specimens collected in the Southern Sea of Korea, from January to December, 2005. The size (standard length, SL) of the specimens ranged from 6.3 to 35.2 cm. D. berycoides is a piscivore that consumes mainly teleosts such as Engraulis japonicus, Acropoma japonicum, and Myctophum nitidulum. Of the fish species Engraulis japonicus was the preferred prey. D. berycoides also eats small quantities of shrimps, amphipods, euphausiids, mysids, and crabs. D. berycoides showed ontogenetic changes in its feeding habits. Smaller individuals (5-10 cm SL) fed mainly on shrimp. The proportion of shrimp decreased with increasing fish size, and this decrease paralleled the increased consumption of fish. Fish accounted for almost all of the stomach contents of individuals larger than 15 cm SL. Cluster analysis based on the percentage dry weight (%DW) identified two size groups: group A (<15 cm SL) consumed primarily shrimp and fish; and group B (15< cm SL) preyed exclusively on fish. There was little seasonal change in the diet of D. berycoides, but shrimp constituted 41.8% of the summer diet in %W.

• 한국양식학회지
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• 제13권1호
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• pp.39-46
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• 2000

우리나라의 대하양식은 먹이생물이 대체로 풍부한 연안 및 만을 중심으로 제방을 쌓거나 폐쇄된 염전 등을 이용하여 극히 한정된 장송에서 실시되고 있다. 본 조사 대하 양식장인 남해의 갈화 양식장은 조석차이를 이용한 해수교환이 주기적으로 실시되고 있으나, 서해의 운호 양식장은 단지 양수에 의한 해수보충이 가끔 실시되고 있을 뿐이다. 따라서, 본 연구는 갈화와 운호양식장의 환경특성을 파악하였고, 이에 따른 성장을 비교.검토하다. 갈화양식자의 저질성상은 사질이 약 70%를 차지한데 비해 운호 양식장은 대부분 펄이 차지하고 있었다. 저질중의 황화물은 갈화 양식장에서 1.8mgS/g-dry, 운호 양식장에서 4.7mgS/g-dry가 측정되어 약 3배의 차이를 나타내었다. 해수중의 ammonia-N 및 $H_2S$ 농도는 갈화 양식장에서 각각 0.10mg/${\ell}$ 및 10.8 ${\mu}$g/${\ell}$가 측정된 반면, 운호 양식장에서는 약 2배 이상 높은 0.31mg/l 및 21.2${\mu}$g/${\ell}$이 측정되었다. 또한, DO는 7월부터 8월에 걸쳐 갈화 양식장에서 6.0mg/${\ell}$이하, 운호 양식장에서는 5.0mg/${\ell}$이하가 관찰되었다. 대하의 체장과 체중은 10월 갈화 양식장의 158.2mm 및 28.9g에 비해 운호 양식장에서는 138.3mm 및 22.9g로 유의하게 낮은 성장을 보였다. 또한, 대하의 일일 성장률도 양식기간을 통해 갈화 양식장에 비해 운호 양식장에서 낮게 나타났다/ 따라서, 운호 양식장의 저층수에서 측정된 ammonia-N, $H_2S$ 및 DO는 대하의 성장에 영향을 미쳤다는 것을 의미한다.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2002년도 제9차 국제심포지움 및 추계정기학술발표회
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• pp.52-52
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• 2002

Chitosan is a key compound of shrimp waste. It is a biopolymer, which is widely used in the field of medical Sciences. Chitosan-TPP (Tripolyphosphate) complex has more or less similar physical properties as Ca-alginate which can be used for the production of synthetic seeds. Possibility of the use of Chitosan-TPP complex as a matrix for encapsulation of somatic embryos was tested against the Ca-alginate complex (2.5w/v Na-alginate, 100mM CaCl2 at pH 5.5). Somatic embryos grown in the induction medium (IM) were drawn into the viscous chitosan solution (1%) and mixed well by inverting the tube carefully. Then the mixture was dropped at regular intervals into the tripolyphosphate (TPP) solution kept on a magnetic stirrer for bead formation. Synthetic seeds formed were washed and transferred into the incubation medium, then allowed either to air-dry or freeze-dry.(중략)