• Title/Summary/Keyword: Muraenesox cinereus

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Feeding Habits of Daggertooth Pike Conger Muraenesox cinereus in the Coastal Water off Goseong, Korea (경남 고성 주변해역에서 출현하는 갯장어(Muraenesox cinereus)의 식성)

  • An, Young-Su;Park, Joo-Myun;Kim, Hyeon-Ji;Baeck, Gun-Wook
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.45 no.1
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    • pp.76-81
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    • 2012
  • The feeding habits of daggertooth pike conger Muraenesox cinereus were studied using 380 specimens collected in the coastal waters off Goseong, Korea, from June to September, 2011. The M. cinereus ranged from 10.0-23.7 cm in anal length (AL). M. cinereus is a piscivore that consumes mainly fish. Engraulis japonicus was the preferred prey, but its diet also included small numbers of crabs, shrimps, cephalopods, and bivalves. The feeding strategy graphical method revealed that M. cinereus is a specialized feeder with a narrow niche width. All size classes of M. cinereus consumed fish and M. cinereus did not show significant ontogenetic changes in feeding habits. The diet overlap index between size classes was >0.96, indicating high diet similarities. The prey size increased significantly with M. cinereus size.

Comparative Spawning Ecology of Daggertooth Pike Conger Muraenesox cinereus and Common Pike Conger M. bagio in the South Sea of Korea (갯장어(Muraenesox cinereus)와 갈창갯장어(M. bagio)의 산란생태 비교)

  • Koh, Eun Hye;Kwon, Dae-Hyeon;Park, Jeong-Ho;Kim, Yeonghye
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.53 no.1
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    • pp.98-102
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    • 2020
  • We examined the comparative spawning ecology of daggertooth pike conger Mureanesox cinereus and common pike conger M. bagio in the South Sea of Korea from May 2018 to December 2019. In the South Sea of Korea, the mean total length (TL) of M. cinereus was significantly smaller than that of M. bagio. The sex ratios of both species were skewed toward females. The spawning period of M. cinereus was from June to October, while the spawning period of M. bagio was from August to October. The lengths at 50%, 75%, and 97.5% sexual maturity of M. cinereus females were estimated as 54.6 cm, 60.4 cm, and 74.1 cm TL, respectively. It was not possible to estimate lengths at sexual maturity for M. bagio in the South Sea of Korea due to the absence of immature stages.

Ecological Characteristics and Proximate Composition of Muraenesox cinereus off the Southern Coast of Korea (한국 남해 연안 갯장어(Muraenesox cinereus)의 생태학적 특성 및 식품 성분 비교)

  • Koh, Eun Hye;Kwon, Dae-Hyeon;Nam, Ki Ho;Kim, Yeonghye;Jang, Choong-Sik
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.52 no.2
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    • pp.173-179
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    • 2019
  • We investigated the ecological characteristics and proximate composition of Muraenesox cinereus off the southern coast of Korea. Anal length distribution, sex ratio, condition factor of M. cinereus individuals caught by costal complex (longline) fisheries were investigated from June to October 2018. The mean anal length was 23.5 cm, which was less than $L_{50}$, indicating that the individuals were mostly immature. Sex ratio is 9:1, we captured 382 females and 29 males, which produced a significantly different ratio (P<0.05). Condition factor remained constant over the study period. The proximate composition of M. cinereus individuals was analyzed from July to October 2018. No significant differences in moisture, crude lipid, crude protein, and ash content were observed between individuals caught in summer and those caught in fall.

Age and Growth of Daggertooth Pike Conger Muraenesox cinereus in the South Sea of Korea (한국 남해에 분포하는 갯장어(Muraenesox cinereus)의 연령과 성장)

  • Koh, Eun Hye;Kwon, Dae-Hyeon;Kim, Yeonghye
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.52 no.6
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    • pp.650-655
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    • 2019
  • The age and growth of Muraenesox cinereus collected in the South Sea of Korea by Danish seine and coastal Long-line fisheries were determined from right sagittal otoliths between May 2018 and April 2019. Otoliths of 353 fish were observed under reflected light, and the edges of the opaque zone were considered to be the otolith ring. Monthly changes in the marginal index indicated that rings (opaque zones) were formed once a year from June to July. The estimated von Bertalanffy growth equation with growth parameters estimated from non-linear regression were Lt=138.37 (1-e-0.18(t+0.79)) for females and Lt=99.00 (1-e-0.13(t+3.99)) for males. The oldest female M. cinereus was 12 years old, and the oldest male was 8 years old.

Basic reproductive biology of Muraenesox cinereus in Korean waters (한국 연근해 갯장어(Muraenesox cinereus)의 생식생태)

  • KOH, Eun Hye;KWON, Dae-Hyeon;JANG, Choong-Sik
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.54 no.4
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    • pp.353-359
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    • 2018
  • Basic reproductive biology of the daggertooth pike conger, Muraenesox cinereus were investigated based on the samples from August 2015 to December 2017 in Korean waters. A total of 2,328 samples was collected (1,593 females and 735 males) during the study period. The mean anal lengths (AL) were $33.5{\pm}9.2cm$ in females and $26.2{\pm}7.3cm$ in males respectively. The females were larger than males in AL (p < 0.05). Sex ratio was 2.2:1 in female to male (p < 0.05). The gonadosomatic index (GSI) varied monthly. GSI of female reached the maximum in July 2016 and June 2017 and the minimum in October 2016 and September 2017 respectively. The spawning period was from June to October. The size at sexual maturity ($L_{50}$) of females was estimated at 24.9 cm in AL (63.5 cm in TL).

Differences and Variations among Anguilla japonica, Muraenesox cinereus and Conger myriaster from the Yellow Sea

  • Yoon, Jong-Man
    • Development and Reproduction
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    • v.19 no.3
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    • pp.163-166
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    • 2015
  • Genomic DNAs were extracted from the muscle of twenty-one specimens of three eel species collected in Anguilla japonica (AJ), Muraenesox cinereus (MC) and Conger myriaster (CM) from the Yellow Sea, respectively. In the present study, 7 oligonucleotides primers generated 191 specific loci in the AJ species, 226 in the (MC) species and 181 in the CM species, respectively. The primer BION-02 generated the most loci (a total of 83), with an average of 11.86 in the AJ species. The specific loci generated by oligonucleotides primers exhibited inter-individual-specific characteristics, thus revealing DNA polymorphisms. With regard to average bandsharing value (BS) results, individuals from Conger myriaster species (0.808) exhibited higher bandsharing values than did individuals from Muraenesox cinereus species (0.729) (P<0.05). The longest genetic distance (0.430) displaying significant molecular difference was also between individual no. 01 within Anguilla japonica eel species and individual no. 04 within Anguilla japonica species. In this study, the dendrogram resulted from reliable seven oligonucleotides primers, indicating three genetic clusters composed of group I (ANGUILLA 01~ANGUILLA 07), group II (MURAENESOX 08~MURAENESOX 14) and group III (CONGER 15~CONGER 21). The existence of species differentiation and DNA polymorphisms among three eel species were detected by PCR analysis. As mentioned above, a dendrogram revealed close relationships between individual identities within three eel species. High levels of a significant genetic distance among three eel species showed this PCR approach is one of the most suitable tools for individuals and/or species biological DNA studies.

A Study of the Diversity and Profile for Extracellular Enzyme Production of Aerobically Cultured Bacteria in the Gut of Muraenesox cinereus (갯장어(Muraenesox cinereus) 장으로부터 호기적 조건에서 분리된 미생물의 다양성 및 세포외 효소 생산능 분석에 관한 연구)

  • Lee, Yong-Jik;Oh, Do-Kyoung;Kim, Hye Won;Nam, Gae-Won;Sohn, Jae Hak;Lee, Han-Seung;Shin, Kee-Sun;Lee, Sang-Jae
    • Journal of Life Science
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    • v.29 no.2
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    • pp.248-255
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    • 2019
  • This research confirmed the diversity and characterization of gut microorganisms isolated from the intestinal organs of Muraenesox cinereus, collected on the Samcheonpo Coast and Seocheon Coast in South Korea. To isolate strains, Marine agar medium was basically used and cultivated at $37^{\circ}C$ and pH7 for several days aerobically. After single colony isolation, totally 49 pure single-colonies were isolated and phylogenetic analysis was carried out based on the result of 16S rRNA gene DNA sequencing, indicating that isolated strains were divided into 3 phyla, 13 families, 15 genera, 34 species and 49 strains. Proteobacteria phylum, the main phyletic group, comprised 83.7% with 8 families, 8 genera and 26 species of Aeromonadaceae, Pseudoalteromonadaceae, Shewanellaceae, Enterobacteriaceae, Morganellaceae, Moraxellaceae, Pseudomonadaceae, and Vibrionaceae. To confirm whether isolated strain can produce industrially useful enzyme or not, amylase, lipase, and protease enzyme assays were performed individually, showing that 39 strains possessed at least one enzyme activity. Especially the Aeromonas sp. strains showed all enzyme activity tested. This result indicated that isolated strains have shown the possibility of the industrial application. Therefore, this study has contributed for securing domestic genetic resources and the expansion of scientific knowledge of the gut microbial community in Muraenesox cinereus of South Korea.

The effects on the size selectivity for Muraensox cinereus, daggertooth pike conger in the coastal longline fishery (연안연승에서 어획되는 갯장어의 크기 선택성에 미치는 효과 분석)

  • KOH, Eun Hye;JANG, Choong-Sik;CHO, Youn-Hyoung;AN, Young-Su
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.56 no.4
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    • pp.292-298
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    • 2020
  • The effects on the size selectivity for Muraenesox cinereus caught by coastal longline fishery were investigated in the southern coast of Korea from June 2 to 17, 2019. Four sizes of hooks (sizes 15, 17, 18 and 19) and two sizes of bait (sizes 9.9 g and 18.3 g) were tested in seven and three fishing trials, respectively. Such results revealed that smaller hook and bait size improved capture efficiency. And our results demonstrate that there was no significant size selectivity effect for hook size (ANOVA, p>0.05), but small bait improved on catching smaller fish (ANOVA, p<0.05).

Antioxidant Effect of HotWaterExtract of Muraenesox cinereus's Skin (갯장어껍질 열수 추출물의 항산화 효과)

  • Shin, Hyun-Jae;Kim, Yoon-Soo;Nam, Hyung-Gun;Na, Myung-Soon;Kim, Mi-Hye;Kang, Hyeong-Bong;Lee, Hee-Duck;Choi, Du-Bok;Choi, On-You;Cha, Wol-Suk
    • KSBB Journal
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    • v.26 no.1
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    • pp.27-32
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    • 2011
  • For the development of functional food and cosmetics using hot water extract of Muraenesox cinereus's skin, contents of vitamin, amino acid and element, and antioxidant activity were investigated. The results are shown as follows: among vitamins, A(0.21mg/100 g), C (78.12mg/100 g), $D_3$ (0.03 mg/100 g), E (1.97 mg/100 g) and Niacin (2.53mg/100 g) were detected, respectively.Mineral contents were an order of K > P > Na > Mg > Ca > Fe and Zn. Contents of total amino acids were an order of Pro > Gly > Arg > Glu > Phe > Ala. Especially, the sum of total amino acids was 27.17 mg/100 mL, which was about 4.0 fold higher than that of free amino acid. DPPH radical scavenging activity of hot water extract of M. cinereus's skin at 25 mg/mL was 63.5% and did not increase at above 50 mg/mL. Activities of antioxidant enzymes in the liver of ethanol-treated rats using hot water extract of M. cinereus's skin were investigated. Compared to control group, activities of ADH and GSH-px were decreased. In the case of CAT and SOD activity, they were increased. These results showed that the hot water extract of M. cinereus's skin can be applied to raw macterial for functional food and cosmetics.

Combined Treatment Effect of High Frequency Therapy with Sharp-Toothed Eel Extract on Men's Skin (고주파요법과 갯장어 추출물 병행처리가 남성피부에 미치는 영향)

  • No, Hyun-Ju;Kim, Yoon-Soo;Nam, Hyung-Gun;Shin, Hyun-Jae;Ryu, Eun-Mi;Na, Myung-Soon;Ahn, Byeong-Kwon;Choi, Du-Bok;Cha, Wol-Suk
    • KSBB Journal
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    • v.26 no.3
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    • pp.260-265
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    • 2011
  • This study aimed to examine the treatment effect of Muraenesox cinereus extract product combined with high frequency on men's damaged skin. The subjects were treated by a product containing M. cinereus extract combined with high frequency therapy for six weeks and tested in skin condition. First, for moisture level change, there was no significant difference between the control group treated only by high frequency therapy and the experimental group treated by a M. cinereus extract product combined with high frequency therapy. But the subjects who increased consistently in moisture level in the cheek and chin were more common in the experimental group. Second, for an oil level, prominently high increase was found in both the control group and the experimental group. Finally, for a rough level, while there was little difference in the control group between immediately after peeling and after six weeks, high improvement effect on a curve was found in the experimental group. Based on this result, cosmetics using M. cinereus extract may have a positive effect on men's skin which is exposed to several stress factors. Accordingly, this result will contribute to developing men's functional cosmetics.