• 한국수산과학회지
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• 제14권1호
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• pp.37-42
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• 1981

무지개송어의 자어기에 Ichthyophonus sp.인 곰팡이가 감염되어 있는 것을 발견하고 그 후 계속 사육된 어군을 6개월마다 채집하여 병리조직학적으로 관찰하였다. 1. 무지개송어의 치어에는 Ichthyophonus sp.가 전신적으로 감염되어 있었으며, 2년생인 어류에는 Ichthyophonus sp.를 둘러싼 육아종이 많이 발생되고 있었다. 2. 각 조직내에 보이는 Ichthyophonus sp.는 다핵구상체가 가장 많았으며, 때로는 발아중인것과 계장체도 나타났다. 3. Ichthyophonus sp.의 cyst 주변에는 대단핵세포가 모인 번식성 염증를 볼 수 있었다.

• 한국양식학회지
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• 제17권1호
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• pp.24-29
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• 2004

2003년 6월과 7월, 고창에서 사육중인 turbot이 약 90% 누적폐사되었고, 주 증상은 안구돌출, 비장 비대 그리고 장내 내용물이 없는 것으로 관찰되었다. 병리조직학적 검사에서 RSIV와 유사한 이형비대세포가 모든 장기에서 관찰되어 RSIV검출을 위한 primer로 PCR을 실시하였다. 그 결과 PCR에서 특이밴드가 모든 조직에서 검출되어졌고, 염기서열 분석 결과 기존에 보고된 strain과 88%이상의 유사성을 나타내는 것으로 확인 되어져서 터봇의 페사 원인으로 이리도바이러스감염이 관여됨을 확인할 수 있었다.

• 수산해양교육연구
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• 제27권2호
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• pp.526-536
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• 2015

대왕바리, Epinephelus lanceolatus의 담수순화 방법에 따른 산소소비 경향을 조사하였다. 염분 변화 조건은 대조구인 35 psu (Exp. I) 외에 단계적 염분변화 조건인 Exp. II($35{\rightarrow}20{\rightarrow}10{\rightarrow}0$ psu)과 Exp. III ($35{\rightarrow}10{\rightarrow}0$ psu) 그리고 급격한 염분변화 조건인 Exp. IV ($35{\rightarrow}0$ psu)로 하였다. 염분 저하 방법별로 산소소비량을 측정한 결과, 수온 $27^{\circ}C$에서 실험어의 평균 산소소비량은 Exp. I에서 $106.9{\pm}0.7mg$ $O_2/kg/h$였다. Exp. II에서는 염분이 $35{\rightarrow}20{\rightarrow}10{\rightarrow}0$ psu로 낮아지면서 각각 $108.1{\pm}2.1$, $99.6{\pm}2.9$, $74.6{\pm}0.9$ 및 $62.7{\pm}1.0mg$ $O_2/kg/h$, Exp. III에서는 각각 $106.5{\pm}1.3$, $77.0{\pm}1.2$ 및 $64.7{\pm}1.2mg$ $O_2/kg/h$로 감소하였다. Exp. IV 역시 산소소비량은 35 psu의 $109.0{\pm}0.9mg$ $O_2/kg/h$로부터 0 psu의 $71.6{\pm}2.0mg$ $O_2/kg/h$로 감소하는 경향을 보였다. 대왕바리는 모든 실험 조건에서 암기 보다 명기에 많은 산소소비량을 보여, 주행성 어종인 것으로 추정되나, 명기와 암기의 산소소비량은 큰 차이를 보이지 않았다. 이상의 결과를 종합해 볼 때, 대왕바리 치어는 염분 저하 방법별 산소소비량에서 서로 차이를 보이지 않아 저염분 순화에 있어 생리적 문제는 발생하지 않았으며, 실험과정 중 폐사한 개체도 없었다. 따라서 대왕바리는 염분변화에 매우 강한 광염성 어종이며, 담수환경에 쉽게 적응할 수 있을 것으로 판단된다.

• Advances in Traditional Medicine
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• 제4권2호
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• pp.91-94
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• 2004

Water and chloroform/methanol extracts of the three local Malaysian snakehead fish, Channa striatus (striped snakehead), Channa micropeltes (giant snakehead) and Channa lucius (blotched snakehead) were evaluated for inhibitory activity in chronic inflammation, using cotton pellet granuloma test. Both water extracts of C. striatus and C. micropeltes showed marked inhibition of the transudative and proliferative components of chronic inflammation (42.9 and 31.2% respectively for C. striatus, 35.6 and 26.2% for C. micropeltes) when compared to those of mefenamic acid (25.1 and 21.3% respectively) and piroxicam (36.1 and 26.2% respectively). The chloroform/methanol extracts did not exhibit any anti-inflammatory effects. These results indicated that C. striatus has more anti-transudative and anti-proliferative activities than the extract of C. micropletes. C. lucius extract in contrast, did not inhibit these two components. This present study indicated the beneficial effects of the water extracts of C. striatus and C. micropeltes, but not C. lucius on chronic inflammation.

• 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.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1997년도 추계학술대회
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• pp.31-34
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• 1997

A semiconductor microelectrode array has been successfully used in obtaining single unit recordings from medial giant nerve of clay fish, rat saphenous nerve and abdominal ganglia of aplysia. The recording device fabricated using silicon microfabrication techniques is a depth-probe type and, previously, has been mostly used to record from central nerve system of vertebrates. From invertebrates, and also from peripheral nerves of vertebrates, however, the quality of the recorded signal depends heavily on the recording conditions, such as the proximity of the electrode site to the nerve cells and the size of the neuron. We have modeled the signal to noise ratio as unctions of these parameters and compared the experimental data with the calculated values thus obtained.

• 한국수산과학회지
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• 제52권6호
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• pp.555-561
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• 2019

We examined the quality characteristics of four kinds of Alaska pollack Theragra chalcogramma surimi (APS), five kinds of golden threadfin bream Nemipterus virgatus surimi (GTS), and two kinds of giant squid Ommastrephes bartrami surimi (GSS) used in Korea. The volatile basic nitrogen contents of APS, GTS, and GSS increased with decreasing grade to 6.8-9.8, 5.5-8.3, and 143.5-177.7 mg/100 g, respectively. The Ca²⁺-ATPase activities of APS and GTS decreased with decreasing grade to 0.63-0.83 and 0.60-0.80 pi μmole/min/mg, respectively. The Ca²⁺-ATPase activity of RA-grade GSS was 0.82-0.91 pi μmole/min/mg. The whiteness values of APS, GTS, and GSS heat-induced gels were 54.0-71.4, 53.9-71.0, and 52.2-70.3, respectively, and that of both APS and GTS decreased with decreasing grade. The gel strengths of APS and GTS heat-induced gels were 412.3-769.4 and 280.2-456.5 g·cm, respectively, and decreased with decreasing grade. The total amino acid contents of SA-grade APS, SSA-grade GTS, and RA-grade GSS were 17,328.1, 17,965.0, and 14,846.8 mg/100 g, respectively, and the major amino acids were glutamic acid, aspartic acid, arginine, leucine, lysine, proline, alanine, and phenylalanine. The primary minerals were sodium (136.6-164.9 mg/100 g), potassium (45.7-160.4 mg/100 g), phosphorus (35.0-73.5 mg/100 g), sulfur (22.8-56.4 mg/100 g), and calcium (18.0-203.4 mg/100 g).

• 한국지반환경공학회 논문집
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• 제18권1호
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• pp.37-47
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• 2017

The Mekong River plays an extremely important role in Southeast Asia. Flowing through six countries, including China, Myanmar, Thailand, Laos PDR, Cambodia, and Vietnam, it is a site of great biological and ecological diversity and the habitat of numerous species of fish. It also supports a very large population that lives along the river basin. Therefore, much attention has been focused on the giant Mekong River Basin, particularly, its soil erosion and sedimentation problems. In fact, many methods have been used to calculate and simulate these problems. However, in the case of the Mekong River Basin, the available data is limited because of the extreme size of the area (about $795,000km^2$) and lack of equipment systems in the countries through which the Mekong River flows. In this study, we applied the Universal Soil Loss Equation (USLE) model in a GIS (Geographic Information System) framework to calculate the amount of soil erosion and sediment load during the selected period, from 1951 to 2007. The result points out dangerous areas, such as the Upper Mekong River Basin and 3S Basin (containing the Sekong, Sesan, and Srepok Rivers) that are suffering the serious consequences of soil erosion problems. Moreover, the present model is also useful for supporting river basin management in the implementation of sustainable management practices in the Mekong River Basin and other basins.

• 한국수산과학회지
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• 제36권5호
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• pp.458-462
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• 2003

This study was to survey proper condition of nitrate removal by hydraulic retention time (HRT) and measured growth of black rockfish (Sebastes schlegeli) and giant croaker (Nibea japonica) in the seawater recirculating culture system designed for nitrate removal. Nitrate conversion to nitrogen at 8 hr-HRT was higher than 16 hr-HRT, amounting to $32.2\;g/m^3/day$ in the seawater recirculating culture system. The removal efficiency of nitrate improved when dissolved oxygen was situated less than 0.5 mg/L. Daily growth rate (DGR) and feed efficiency (FE) of S. schlegeli with mean body weight of 108 g in 8 hr-HRT were significantly higher values than those in 4 hr-HRT (P<0.05). The DGR and FE of N. japonica with mean body weight of 12 g in added carbon system showed not differing in the values from N. japonica in control system (P>0.05).

• 한국어병학회지
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• 제8권1호
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• pp.13-21
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• 1995

1994년 6월부터 9월사이에 장포자충병이 발생했던 3 개 저수지산 아가미지렁이에서 4 종의 방선포자충인 Aurantiactinomyxon sp. A, B, C와 Neoactinomyxon sp. D가 방출되었다. 방선포자충이 기생한 아가미지렁이는 식도에서 항문에 이르기까지 장상피조직 전체에 기생하였고, 몸의 뒷쪽으로 갈수록 성숙한 방선포자충을 볼 수 있었다. 방출 직전의 성숙한 방선포자는 지렁이 장관 상피에서 각각 개체적으로 분리되어 있었으나, 미숙한 것은 $60{\times}65{\mu}m$ 크기의 포낭체속에 원형질 크기 $20{\times}25{\mu}m$인 미숙한 방선포자가 6 개씩 들어 있었다. 3 개 저수지에서 조사한 아가미지렁이 총 1,762 마리에서 4.88% 인 88 마리가 기생되었다. 이중 Aurantiactinomyxon sp. A는 0.74% (13 마리), Aurantiactinomyxon sp. B 는 2.27% (40 마리), Aurantiactinomyxon sp. C 는 1.59% (28 마리) 이었고, Neoactinomyxon sp. D는 0.28% (5 마리) 이었다. 22.6-$30.7^{\circ}C$ 실온에서 32 일동안 아가미지렁이에서의 방선포자충의 방출 일수는 1 일 (1 회)이 전체의 23.4% 이었고, 그 다음이 5 일 (5 회)로 11.7% 이었으며, 대부분이 15 일이내에 방출이 완료되나, 32 일째에서도 방출하는 것 (6.7%)도 있었다.