• 한국수산과학회지
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• 제32권6호
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• pp.689-692
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• 1999

양식산 은어의 품질 향상을 위한 연구의 일환으로 섬진강과 밀양강에서 채포된 천연산과 하동과 밀양 소재의 양식장에서 구임한 양식산 은어의 근육 및 난에 대하여 일반성분 조성을 분석, 비교한 결과는 다음과 같다. 천연산 은어 근육의 수분함량은 $76.7\~77.5\%$, 단백질 $18.4\~19.9\%$, 지질 $2.41\~3.47\%$, 회분 $1.04\~1.33\%$으로 산지에 다른 차이가 거의 없었다. 양식산 은어 근육에서 단백질과 회분 함량은 천연산과 유사하였으나, 지질($4.68\~10.1\%$) 및 탄수화물($1.14\~2.82\%$) 함량은 천연산에 비하여 많았으나 수분 함량은 적었으며, 특히 지질 함량은 양식장에 따라 상당한 차이를 나타내었다. 따라서 양식장에 따른 일반성분 조성 차이는 그들의 사료 조성의 차이가 크게 기여한 것으로 볼 수 있었다. 또한 지질 함량은 거의 모든 시료에서 수컷에 비하여 암컷에서 약간 많은 경향을 보였다. 은어난의 일반성분 조성 중 지질, 단백질, 탄수화물 함량은 근육에 비하여 많았으나 수분 함량은 상대적으로 적었으며, 근육의 경우와 달리 산지 및 양식장에 따라 상당한 차이를 나타내었다. 시험된 모든 시료에서 지질과 수분 함량 사이에는 y= -0.2715x+24.903 (r= -0.7253, p<0.001)로 역의 상관관계를 나타내었다.

• 한국어병학회지
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• 제24권2호
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• pp.161-166
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• 2011

경상북도 영덕군의 하천에 서식하는 점몰개 spotted barbel gudgeon (Squalidus multimaculatus Hosoya et Jeon)의 근육에서 새인두흡충 Clinostomum complanatum (Rudolphi, 1814)의 피낭유충이 발견되었다. 감염된 점몰개는 "yellow grub"인 기생충의 피낭유충으로 인해 표면이 울퉁불퉁하게 보였으며, 수면위에 힘없이 유영하였고 일부 폐사한 개체도 발견되었다. 분리된 탈낭유충의 형태는 혓바닥모양이었으며, 크기는 2.85~5.89 mm${\times}$0.8~1.99 mm였다. 어체당 1~98개의 피낭유충을 분리하였으며 평균 감염수는 25개로 나타났다. 특히, 성어크기인 평균 7cm 정도의 점몰개는 100% 감염되어 있었다. 본 연구는 한국의 자연수계에 서식하는 어류에서 C. complanatum 의해 질병이 발생하고 폐사가 일어난 첫 보고이다.

• 환경생물
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• 제21권1호
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• pp.26-30
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• 2003

해산 어류가 cyochrome P450(CYP)유도제로 알려진 $\beta$-naphthoflavone(BNF)에 의해 어떤 반응을 하는지 살펴보기 위하여, 양식 어류로는 조피볼락(Sebastes schlegeli), 넙치 (Paralichthys olivaceus), 참돔(Pagrus major)을 그리고 자연산 어류로는 숭어(Mugil cephalus)와 쥐치 (Stephanolepis cirrhifer)를 대상으로 조사하였다. 숭어와 쥐치, 참돔의 미크로좀은 DMSO (dimethyl-sulfoxide)로 녹인 BNF를 10 mM이 되도록 첨가하였고, 조피볼락과 넙치의 경우에는 5 mM이 되도록 첨가하여 $30^{\circ}C$의 수조에서 9시간까지 배양하면서 CYP 함량의 경시적인 변화를 조사하였고, 각 어류는 2% 농도로 DMSO 만을 첨가하여 같은 조건으로 배양한 대조구에 대한 상대비(%)로 나타내었다. 그 결과, 대부분의 어류에서는 배양 3~5시간에 최대값을 보이고 이후 줄어들었으나 참돔은 9시간까지도 계속 증가하는 경향을 보였다. 한편,BNF에 의한 CYP 유도 정도는 양식산 어류가 자연산 어류보다 커서 차이를 보였다 즉, 양식산 어류인 넙치, 조피볼락 및 참돔의 CYP 함량은 BNF의 노출농도를 감안하지 않더라도 각 어류의 처음 수준에 비해 207~422%까지 늘었던 것에 비해 자연산 어류인 숭어와 쥐치에서는 206~207%증가하는데 불과하였다. 이처럼 양식산과 자연산 어류에서 CYP 유도제에 의한 CYP 유도정도의 차이는 서식환경의 차이에 따라 생기는 것이라 여겨진다.

• Parasites, Hosts and Diseases
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• 제46권2호
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• pp.77-82
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• 2008

Fishborne zoonotic metacercariae have not been reported from brackish water and marine fish from Vietnam waters although these parasites are common in the country's freshwater fish. Both wild-caught and cultured grouper (Epinephelus coioides and Epinephelus bleekeri), and mullet (Mugil cephalus) from brackish and marine waters located in Khanh Hoa province in central coastal Vietnam were examined, and found positive for zoonotic trematode metacercariae. From grouper, Heterophyopsis continua and Procerovum varium were recovered. The prevalence of H. continua ranged from 2.0 to 6.0% and that for P. varium ranged from 11.6 to 15.8%. Mullet were infected with Pygidiopsis summa and H. continua; both of these species are new records for Vietnam. The prevalence of P. summa in mullet was generally high, ranging from 17.6 to 75.5%, and was significantly higher than the prevalence of H. continua (2.5 to 32.4%). There were no significant differences in the prevalence of metacercariae between grouper from natural or cultured habitats, indicating that the highest risk of infection occurs in the wild-caught state prior to their placement in culture. Further, there was no difference in metacercarial prevalence between the 2 species of grouper. Infected wild-caught seed were only observed from January to October. Monthly variation in prevalence suggests seasonal variation in mullet infections occurs in this region with the highest transmission taking place from October to December. Basic investigations on the ecology and epidemiology of these intestinal flukes need to be carried out to determine their significance as a public health problem and the aspects of their biology that may be vulnerable to control interventions.

• Journal of Plant Biotechnology
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• 제48권4호
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• pp.223-227
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• 2021

재배종 고구마 [Ipomoea batatas L. (Lam)]의 정확한 기원종은 아직 밝혀지지 않았으며 다양한 가설들이 보고되었다. 재배종과 동일한 batatas 그룹에 속한 야생종을 대상으로 RFLP 패턴, microsatellite 마커, SNP 마커, FISH 기법, 반수체에 대한 게놈분석 등의 비교 연구에 의하면 I. trifida, I. leucantha, I. littoralis, I. tabascana, I. tenuissima, I. tiliacea, I. triloba 등이 가능성이 있는 것으로 제안되었다. 그러나, 최근의 진보된 유전체분석기술과 자연상태에서 수평전이현상에 의하여 재배종 고구마 및 다양한 야생종들의 염색체 내 삽입된 T-DNA의 유전자 구조, 삽입위치, 유전자 재배열 등의 특성을 조사한 연구 결과들을 종합하여 보면 기존에 제안된 이들보다 오래된 조상종이 존재할 것이라는 새로운 가설이 제시되었다.

• 한국어병학회지
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• 제23권1호
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• pp.107-112
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• 2010

2007년 봄철 전남 여수 연안에서 자연 서식하는 복섬에서 Pseudocaligus sp.의 기생이 확인되었다. 숙주에 감염된 충은 preadult 및 adult 단계의 형태를 보였으며, 충체는 투명하였고 편평하며, 두흉부, 생식절, 복부로 구성되어 있었다. 충의 전단부에는 lunule이라고 하는 1쌍의 흡착구조물이 관찰되었다. 구제방법을 검토하기 위해 포르말린과 담수로 처리한 결과, preadult 및 adult 단계의 Pseudocaligus sp.는 50~400ppm의 포르말린 약욕처리에서 1시간 이내에 100%가 탈락 되었으나, 담수욕 처리에서는 90분 동안 57%의 탈락률을 보였다.

• Fisheries and Aquatic Sciences
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• 제26권6호
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• pp.367-379
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• 2023

The rapid expansion of shrimp production requires a huge amount of protein sources from soybeans and wild-caught fishmeal; both are becoming a shortage. Meanwhile, catfish production and processing is a giant industry in Vietnam, which produce hundred thousand tonnes of protein- and lipid-rich by-products, annually. Using catfish by-products to gradually replace the traditional protein sources in shrimp aquaculture may bring triple benefits: 1) reducing pressure on wild fish exploitation for fishmeal, 2) reducing the environmental impacts of catfish by-products, and 3) increasing the value and sustainability of aquaculture production. In this study, we used catfish by-products to produce fish protein hydrolysate (FPH) and nano-hydroxyapatite (HA) as additives in feed for Pacific white shrimp (Litopenaeus vannamei). The supplement mixture of FPH and HA was added into the commercial diet (Charoen Pokphand Group [CP], 38% protein, and 6.5% lipid) to reach 38%, 38.5%, 40%, 43%, and 44% of the crude protein content. The survival and growth of shrimps were weekly assessed to day 55. The results showed that the shrimp growth was highest at 43% crude protein content in the feed as indicated by an increase of 124% and 112% in shrimp weight and length, respectively, compared to the commercial reference diet. No negative effects of adding the mixture of FPH and HA on the water quality were observed. Vibrio density was lower than 6.5 × 10³ CFU/mL, which is the lowest Vibrio density negatively affecting the shrimp growth and development. These findings indicate that the mixture of FPH and HA are promising additive components in feed for post-larval shrimp L. vannamei diets.

• Animal cells and systems
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• 제14권1호
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• pp.37-44
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• 2010

Black sea bream, Acanthopagrus schlegelii, is a commercially important fish in Korea. As a preliminary investigation into the effect of hatchery rearing for stock enhancement, we examined genetic diversity between wild and farmed black sea bream populations from Jeju using six microsatellite markers. High levels of polymorphism were observed between the two populations. A total of 87 different alleles were found at the loci, with some alleles being unique. Allelic variability ranged from 8 to 22 in the wild population and from 7 to 17 in the farmed one. Average observed and expected heterozygosities were estimated at 0.87 and 0.88 in the wild sample. The corresponding estimates were 0.83 and 0.86 in the farmed sample. Although a considerable loss of rare alleles was observed in the farmed sample, no statistically significant reductions were found in heterozygosity or allelic diversity in the farmed sample, compared with the wild one. Significant genetic heterogeneity was found between the wild and farmed populations. These results suggest that more intensive breeding practices for stock enhancement may have resulted in a further decrease of genetic diversity. Thus, it is necessary to monitor genetic variation in bloodstock, progeny, and target populations and control inbreeding in a commercial breeding program for conservation. This information may be useful for fisheries management and the aquaculture industry.

• Parasites, Hosts and Diseases
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• 제55권3호
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• pp.287-294
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• 2017

The present study was performed to record new definitive hosts of Isthmiophora hortensis, and to describe morphological characteristics derived from a variety of worm samples for clarification of its taxonomic validity. Morphological characteristics with dimensions were observed in worm samples (n=21) from naturally infected wild animals, including a raccoon dog Nyctereutes procyonoides from Gimhae-si (City), Gyeongsangnam-do, stray cats and a striped field mouse from several localities, and a wild boar Sus scrofa, from Gurye-gun (County), Jeollanam-do. In addition, adult flukes (n=45) recovered in albino rats experimentally infected with the metacercariae from a freshwater fish species were also subjected to morphological studies. The mean ratios of the body length (BL) to body width (BW) were 5.86 and 5.76 in worms from wild animals and experimental rats, respectively. Those of the ventral sucker to oral sucker were 2.92 and 3.01 in worms from 2 groups. The mean percentages of the hindbody length (HBL) to BL were 42.1 and 41.2 in 2 groups. Those of uterine fields to BL were 9.8 and 12.2 in the 2 worm groups. By the present study, the 2 species of wild animals, the raccoon dog and wild boar, have been added as new definitive hosts for I. hortensis. The morphological characteristics of adult flukes derived from a variety of host source were redescribed to support the taxonomic validity of this echinostome species.

• 한국양식학회:학술대회논문집
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• 한국양식학회 2003년도 추계학술발표대회 논문요약집
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• pp.76-77
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• 2003

Olive flounder Paralichthys olivaceus larvae and early juveniles were reared for 43 days after hatching in order to observe the effects of starvation during development and metamorphosis. Morphological, histological and biochemical measurements were made to assess the nutritional condition during growth and starvation from pre-matamorphic through post-metamorphic phases. Two groups of fish were compared ; one with sufficient food supply and one under continuous starvation until death. Among morphometric analyses, both ratios of body height at anus/head height and pre-/post-anal lengths appeared to be sensitive to starvation during which substantial reduction was observed within a day of food deprivation. Histological variables as intestinal and rectal epithelial heights and gall bladder volume changed significantly with onset of starvation. The gut epithelial heights of starving fish decreased with advances in starvation, although they fluctuated during mid-metamorphic phase. In contrast, gall bladder volume increased remarkably soon after starvation. Ontogenetic changes in both gut epithelial height and gall bladder volume were evident, those associated with settlement and/or completion of metamorphosis. Abrupt decrease in the RNA/DNA ratios of starving fish were found right after onset of starvation. Even in the fed fish marked fluctuations in its ratios during metamorphosis were observed, evident by decreasing from late-metamorphic to post-metamorphic stages. These findings suggest that a combination of morphologically and histologically sensitive characteristics, and biochemical measurement could be utilized as a measure to evaluate nutritional condition related to starvation in wild olive flounder larvae and juveniles.