• Title, Summary, Keyword: Paralichthys olivaceus

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A Study on the Organoleptic Characteristics and Changes in Freshness of Cultivated and Wild Paralichthys olivaceus During Storage (양식산 넙치와 자연산 넙치의 관능적 특성 및 저장중 신선도 변화 연구)

  • 박병학;박소희;조재선
    • Korean journal of food and cookery science
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    • v.19 no.1
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    • pp.72-78
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    • 2003
  • This study was conducted to investigate the physicochemical and organoleptic characteristics and freshness of wild and cultivated Paralichthys olivaceus during storage. By the results of morphological observation, wild Paralichthys olivaceus had white abdomen, light black skin and transparent muscle, but cultivated Paralichthys olivaceus had black spotted abdomen, dark black skin and dark pink muscle. Moisture contents of wild and cultivated Paralichthys olivaceus were similar, but the lipid content was higher in cultivated Paralichthys olivaceus than that of wild Paralichthys olivaceus. Sensory scores of appearance, taste, texture and overall acceptability were higher in wild Paralichthys olivaceus than that of cultivated Paralichthys olivaceus. The reason was that lipid content was higher in cultivated Paralichthys olivaceus The freshness of cultivated Paralichthys olivaceus seemed to last shorter than that of wild one due to rapid increase of the volatile basic nitrogen content, pH and total microbial count during storage.

Feeding Habits of Olive Flounder (Paralichthys olivaceus) Collected from Coastal Waters off Taean, Korea (태안연안에서 서식하는 넙치 (Paralichthys olivaceus)의 식성)

  • Huh, Sung-Hoi;Lee, Dong-Jin;Choo, Hyun-Gi;Park, Joo-Myun;Baeck, Gun-Wook
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.43 no.6
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    • pp.756-759
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    • 2010
  • The feeding habits of olive flounder, Paralichthys olivaceus were studied using 126 specimens collected from coastal waters off Taean, Korea from April 2008 to March 2009. The total lengths of P. olivaceus ranged from 16.7 to 40.6 cm. P. olivaceus was a piscivore that consumed mainly fishes. The diet also included small quantities of shrimps, cephalopods, polychaetes and mysids. Although, P. olivaceus mainly consumed fishes of all size classes, some degree of change in diet composition was found; i.e. after fishes, smaller individuals fed more on shrimps, whereas larger individuals consumed more cephalopods.

Anatomical Ultrastructure of Spermatozoa of Paralichthys olivaceus (Paralichthyidae, Perciformes) from Korea (한국산 넙치 (Paralichthys olivaceus) 정자의 미세해부학적 구조)

  • Kim, Kgu-Hwan;Lee, Byung-Chan;Nam, Myung-Mo
    • Korean Journal of Ichthyology
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    • v.23 no.2
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    • pp.106-110
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    • 2011
  • Fine structure of spermatozoa of the bastard halibut (Paralichthys olivaceus) is described. Its structure is characterized by acrosomeless, having a spherical head region and a small mid piece containing five mitochondria disposed one row. The flagellum inserts centrally on the nucleus and has lateral ribbons. The present study supports the suggestion that spermatozoal ultrastructure is of taxonomic importance and may be a phylogenetic criterion in teleostei.

Pseudolepidapedon kobayashii (Digenea: Allocreadiidae) from the Olive Flounder (Paralichthys olivaceus) of the Korean Southern Sea (남해 연안 넙치(Paralichthys olivaceus)에 기생하는 이생흡충류, Pseudolepidapedon kobayashii, 1종에 대한 국내 보고)

  • Kim, Ki-Hong;Kwon, Se-Ryun;Ahn, Kyoung-Jin;Huh, Sung-Hoi
    • Journal of fish pathology
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    • v.12 no.1
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    • pp.63-65
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    • 1999
  • Pseudolepidapedon kobayashii collected from the alimentary canal of the olive flounder, Paralichthys olivaceus, which were caught at the Chinhae Bay, was reported for the first time in Korea, and P. olivaceus was recorded as a new host for P. kobayshii. The morphological characteristics of P. kobayashii were described and compared with the other species in the genus.

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Feeding Habits of Paralichthys olivaceus in the Uljin Marine Ranching Area (동해 울진바다목장에 서식하는 넙치(Paralichthys olivaceus)의 식성)

  • Choi, Jung-Hwa;Yoon, Sang-Cheoul;Lee, Sung-Il;Kim, Jong-Bin;Kim, Hye-Rim
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.44 no.6
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    • pp.684-688
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    • 2011
  • The feeding habits of Paralichthys olivaceus in the Uljin marine ranching area, located on the mid-eastern coast of Korea, were studied from January to November 2009. In total, 381 specimens were collected; fish ranged in size from 15.4 to 59.0 cm in total length. P. olivaceus is a carnivore, mainly consuming other fishes and crustaceans. The prey items of P. olivaceus changed ontogenetically. Small individuals fed on decapod crustaceans while large ones fed heavily on other fishes. The diet of P. olivaceus varied seasonally. Fish comprised the main prey items throughout the year. The stomach contents index (SCI) of each size class increased and the dietary breadth index (DBI) of each size class decreased as individuals grew.

Cloning of Melanin Concentrating Hormone cDNA Gene from Olive Flounder (Paralichthys olivaceus) (넙치 (Paralichthys olivaceus)에서 멜라닌 농축 호르몬 cDHA 유전자의 클로닝)

  • JEON Jeong Min;SONG Young Hwan
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.36 no.5
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    • pp.442-448
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    • 2003
  • Melanin concentrating hormone (MCH) regulating color change of fish skin was identified from brain cDNA library of Olive flounder (Paralichthys olivaceus) during the analysis of Expressed Sequence Tags (ESTs). Olive flounder MCH gene consisted of 598 nucleotides encoding 150 amino acids. Olive flounder MCH protein revealed to contain signal peptide of 19 amino acid residues, pro-MCH of 131 amino acids being processed to biologically active and mature form of hormone with 25 amino acid residues at the carboxyl terminus. A comparative structural analysis revealed that Olive flounder MCH precursor had low sequence identity with other fish species and mammalian counterparts, while the amino acid sequences of mature hormone had a relatively high identity and more conserved. RT-PCR analysis revealed that olive flounder MCH precersor gene was expressed spectically only in the brain and not in other tissues.

Changes in Steroid Hormones Levels of Olive Flounder, Paralichthys olivaceus Exposed to Phenanthrene

  • Jee, Jung-Hoon;Min, Eun-Young;Kim, Dae-Jung;Kang, Ju-Chan
    • Korean Journal of Environmental Biology
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    • v.21 no.4
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    • pp.352-357
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    • 2003
  • Phenanthrene, one of Polycyclic aromatic hydrocarbons with three aromatic rings, is a ubiquitous contaminant in the environment. Phenanthrene has been identified in ambient air, drinking water and sediment. We examined the effect of phenanthrene on steroid hormones level of olive flounder, Paralichthys olivaceus. Plasma testosterone level was increased significantly in fish exposed to phenanthrene($\geq1.0 \mu M$) at 4th week. However, there was no significant changes of estradiol-17$\beta$ concentration in fish exposed to phenanthrene. The physiological variation in phenanthrene exposed fish was a dramatic increase in plasma cortisol level. It is concluded that chronic exposure of phenanthrene can induce increase of plasma testosterone levels and elevate the plasma cortisol level in flounder, Paralichthys olivaceus.

Histological Changes of Hepatocyte and Intestinal Epithelium during Starvation in Olive Flounder Paralichthys olivaceus (넙치 Paralichthys olivaceus 기아시 간세포 및 장상피세포의 조직학적 변화)

  • Park In-Seok
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.39 no.3
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    • pp.303-307
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    • 2006
  • The effects of starvation on histological changes in hepatocytes and the intestinal epithelium in the olive flounder, Paralichthys olivaceus were examined. The starved group was not fed for 12 weeks, whereas the fed group was given food. Food deprivation resulted in a significant decrease in hepatocyte nucleus size and nuclear height in the intestinal epithelium (P<0.05). In the starved group, pronounced degenerative changes were seen in the histology of hepatocytes and the intestinal epithelium; the tissue morphology was irregular and the nuclei were stained basophillic, shrunk irregularly, and very compact. These results suggest that histological changes in hepatocytes and the intestinal epithelium can be used as an indicator of starvation in the olive flounder. In addition, the data are interpreted in detail and some biologically important relationships are discussed.

Effects of chloramphenicol on chemiluminescence response of leukocytes isolated from olive flounder, Paralichthys olivaceus (양식산 넙치, Paralichthys olivaceus 식세포의 식작용 활성에 미치는 chloramphenicol의 영향)

  • Seo, Jeong-Su;Jeong, So-Jeong;Lee, Sang-Hwan;Kim, Na-Yeong;Eom, Hye-Gyeong;Heo, Min-Do;Jeong, Hyeon-Do;Jeong, Jun-Gi
    • Journal of fish pathology
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    • v.17 no.3
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    • pp.217-222
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    • 2004
  • This study was performed to investigate the immunological side effects of chloramphenicol (CAP) on olive flounder, Paralichthys olivaceus. To investigate immunological effects on olive flounder, we determined the changes of chemiluminescence (CL) response of flounder kidney-derived leucocyte after the treatment of CAP in vivo and in vitro. The CL activity was significantly decreased in a dose-dependent manner during the treatment of CAP in vitro. Similarly, a dose-dependent reduction of CL response, although not significant, were observed during the treatment of CAP in vivo. The results suggest that CAP reduced the function of flounder phagocytosis in vivo and in vitro, indicating the immunosuppressive ability of CAP.

Effect of Transport Stocking Density on the Physicochemical Characteristics of Muscle from Olive Flounder Paralichthys olivaceus (수송밀도가 넙치(Paralichthys olivaceus) 근육의 물리화학적 변화에 미치는 영향)

  • Shim, Kil Bo;Yoon, Ho Dong
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.47 no.6
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    • pp.707-712
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    • 2014
  • The effects of transport stocking density (500, 600 and 700 kg of olive flounder Paralichthys olivaceus/per water tank) on the physicochemical characteristics of muscle were investigated. Transport of the animals took, on average, 10 days from Busan, Korea, to Long Beach, CA, USA. There was no significant difference in the breaking strength of muscle among the three groups. There was also no significant difference in the ATP, lactate, or glycogen content of muscle from the 500 and 600 kg/tank stocking density groups at the beginning and after transport. However, the ATP content decreased sharply while the lactate content increased in muscle from fish transported at a density of 700 kg/tank at the beginning of transport, and the ATP and lactate contents in this group were stable after transport.