• 한국수산과학회지
• /
• 제57권4호
• /
• pp.423-428
• /
• 2024

The diet composition of the whitespotted conger Conger myriaster was analyzed using 1,047 specimens collected from the coastal waters of the South Sea of Korea. Specimens sizes ranged from 11.4 to 46.8 cm in anal length. C. myriaster mainly fed on Engraulis japonicus (Pisces index of relative importance 82.1%). The dietary composition of C. myriaster did not differ significantly across size classes. As the body size of C. myriaster increased the mean weight of prey within the stomach (mW/ST) also increased (one-way ANOVA, P<0.05).

• 한국수산과학회지
• /
• 제41권4호
• /
• pp.282-288
• /
• 2008

Feeding ecology of the white-spotted conger eel Conger myriaster in the Southern Sea of Korea was examined. Specimens were caught monthly from January 2004 to December 2006. Primary prey items of C. myriaster included fish, shrimp, and crabs. C. myriaster exhibited a nocturnal feeding strategy and preyed upon a wide range of pelagic fish groups(e.g., Engraulis japonicus, Glossanodon semifasciatus, and Maurolicus muelleri). This species was also an opportunistic feeder that exploited the available prey in each area(i.e., fish in the A area and shrimp in the B area). The composition of the diet of C. myriaster exhibited seasonal fluctuations that were related to food availability during each season. The observed ontogenetic shifts in diet were relatively clear, despite substantial overlap between the 10 cm and 20 cm groups of C. myriaster.

• Parasites, Hosts and Diseases
• /
• 제34권4호
• /
• pp.283-285
• /
• 1996

196년 9월 7일 전남 목표항에서 구입한 붕장어의 아가미 새엽에서 6개체의 피낭유충이 검출되었다. 이중 탈낭된 한 개의 형태를 관찰한 바 긴이형흡충의 피낭유충으로 동정되었으며, 붕장어가 긴이형흡층의 제2중간숙주 역활을 한다는 것으로 보고있다.

• 한국수산과학회지
• /
• 제44권6호
• /
• pp.689-694
• /
• 2011

Age and growth of whitespotted conger Conger myriaster were estimated using right sagittal otoliths from 495 fish collected from February, 2004, to January, 2005, in the southern coastal waters of Korea. Examination of the outer margin of the otoliths showed that opaque zones formed once a year and annual rings formed from April to June. The ages of the specimens examined ranged from 3 to 8 years. Whitespotted conger spawn from December to March. Allometry between preanal length and total weight can be expressed as $TW=0.0350{\times}PL^{2.9173}$ ($R^2=0.89$). There was no significant difference in allometry between females and males (P>0.05). The estimated VBF growth equation was $L_t=415.2(1-e^{-0.1457(t+0.4654)})$.

• 한국어류학회지
• /
• 제32권2호
• /
• pp.103-109
• /
• 2020

붕장어(Conger myriaster)는 2018년 6월부터 2019년 5월까지 거제 구조라, 망치 인근해역에서 장구형통발을 이용하여 매달 1회 채집해 이용하였으며, 항문장(Preanus length)과 습중량을 각각 0.1 cm, 0.1 g까지 측정한 뒤 위를 적출하여 가능한 종 수준까지 분석하였다. 위내용물 분석결과는 각 먹이생물에 대한 출현빈도(%F), 개체수비(%N), 습중량비(%W)를 구하여 상대 중요도지수비(%IRI)로 수치화하여 주 먹이생물과 크기군에 따른 먹이조성 변화를 알아보았다. 붕장어의 가장 중요한 먹이생물은 어류(Pisces)였으며, 그중 멸치(Engraulis japonicus)가 가장 우점한 먹이생물로 확인되었다. 그 외, 새우류(Macrura), 패충류(Ostracoda), 갯지렁이류(Polychaeta), 게류(Brachyura) 등 다양한 먹이생물을 섭식하였지만 그 양은 많지 않았다. 과거 광양만에서 이루어진 연구에서는 붕장어의 주 먹이생물이 날개망둑(Favonigobius gymnauchen)으로 나타나 이번 연구결과와 다소 차이가 있었다. 성장에 따른 위내용물 조성의 변화를 살펴본 결과, 뚜렷한 먹이전환이 나타나지 않았다. 붕장어는 성장함에 따라 개체당 평균 먹이생물의 개체수(mN/ST)는 통계적으로 유의한 차이를 보이지 않았으나, 평균 먹이생물의 중량(mW/ST)은 붕장어의 항문장이 증가함에 따라 유의하게 증가하는 경향을 보였다.

• 한국수산과학회지
• /
• 제37권6호
• /
• pp.492-497
• /
• 2004

Waste concentration and waste generation rate in seawater aquaria by common conger (Astrocongey myriaster) and olive flounder (Paralichyhus olivaceus) were investigated. The initial fish density of common conger and olive flounder were $3{\%}\;and \;2.8{\%}$ of total weight of aquarium water, respectively Wastes in the seawater aquaria, such as protein, total suspended solid (TSS), ammonia, turbidity and chemical oxygen demand (COD) increased with days after stocking. Protein generation rate of common conger increased until 1 day after stocking while that of olive flounder increased until 3 days. The average protein generation rates of common conger and olive flounder were $0.28g/kg{\cdot}day\;and\;0.21g/kg{\cdot}day$, respectively. The trends of other waste generation rate were similar to protein generation rate.

• 한국수산과학회지
• /
• 제48권4호
• /
• pp.417-425
• /
• 2015

Semi-dried conger eel Conger myriaster is considered as a health food in Korea due to its richness in vitamins, minerals, proteins and omega-3 fatty acids. This study characterize the sanitary quality of commercial semi-dried conger eel for developing high quality semi-dried products and suggested the guideline for controlling the quality. Moisture content ranged from 41.2% to 73.4% (mean: 61.5%), volatile basic nitrogen ranged from 16.1 to 93.6 mg/100 g (mean: 55.1 mg/100 g), and peroxide value ranged from 15.2 to 69.8 meq/kg. Viable cell counts ranged between 6.51 and 8.53 log CFU/g, while the Escherichia coli count ranged from undetectable to 4.6 log CFU/g. Based on these chemical and microbial findings, we suggest that provisions be established for development of high quality semi-dried conger eel as follows: 50-68% for moisture content, < 50 mg/100 g for volatile basic nitrogen content, < 60 meq/kg for peroxide value, and negative for E. coli. Among the 16 commercial semi-dried conger eel products used in this study, the standard-passed product was only GS-L.

• Fisheries and Aquatic Sciences
• /
• 제2권1호
• /
• pp.32-35
• /
• 1999

During the course of studying the helminth fauna from the fishes of the Korean coastal waters, two bucephalid species, Dolichoenterum longissimum Ozaki, 1924 and Prosorhynchus aculeatus Odhner, 1905, were collected from the alimentary canal of the conger eel, Conger myriaster. D. longissimum was characterized by having the ovary between the testes, and 7-8 horn-like projections on the ventral side of rhynchus. P. aculeatus was distinguished from the other species by the location of the mouth or the opening position of the excretory vesicle. These two bucephalid digeneans are new to the Korean fauna.

• 한국수산과학회지
• /
• 제45권4호
• /
• pp.358-366
• /
• 2012

A novel neuropeptide was isolated from the skin of the conger eel Conger myriaster using hagfish Eptatretus burgeri intestine as a bioassay system. The sequence of the purified peptide was analyzed using automated amino acid sequencing and MALDI-TOF mass spectrophotometry. The molecular ion peak in the MALDI-TOF mass spectrum of the peptide was at m/z 962.89 $(M+H)^+$. The sequence of the peptide was determined to be L-P-M-L-E-T-Q-M, and was tentatively named comyrin. To investigate the complete primary structure of comyrin, comyrin-OH and comyrin-$NH_2$ were synthesized and the chemical and pharmacological properties of the synthetic peptides were compared with those of the native peptide. However, the elution time of synthetic peptides did not match that of the native peptide on the reverse-phase HPLC chromatogram. In addition, the synthetic peptides did not cause contractile activity in the intestinal smooth muscle of the hagfish. Based on these results, one possible reason for this disagreement may be the presence of a D-amino acid in comyrin.

• 한국수산과학회지
• /
• 제38권5호
• /
• pp.286-290
• /
• 2005

Oxytocin (OT)-related peptide, isotocin was purified from the brain extract of conger eel (Conger myriaster) using reverse-phase, ion-exchange and size exclusion high performance liquid chromatography (HPLC). The sequence of the peptide, with a molecular weight of 967.30 Da, was determined as Cys-Tyr-Ile-Ser-Asn­Cys-Pro-Ile-Gly-$NH_2$, where the Cys between 1st and 6th residues made an intramolecular disulfide bridge by the automated amino acid sequence analysis and MALDI-TOF mass spectrometry. The sequence was confirmed by identical elution with the purified and synthetic peptide using the HPLC system. As a result of homology investigation, the primary structure of this peptide was the same as that of OT -superfamily member, isotocin. The synthetic peptide showed a contractile activity at a minimal effective concentration of $10^{-7}M$ on the intestinal smooth muscle of goldfish (Carassius auratus).