• 대한수의학회지
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• 제40권3호
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• pp.415-420
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• 2000

Distribution of S-100 protein-immunoreactive cells in the gastrointestinal tract of the catfish, Silurus asotus was investigated by PAP method. S-100 protein-immunoreactive cells were mainly observed just under the epithelium of the gastrointestinal tract. Immunoreactive cells were distributed numerously in the stomach and moderately in the middle part of the intestine, however, a few in the upper and lower part of the intestine.

• 한국양식학회지
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• 제17권1호
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• pp.8-11
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• 2004

Milt of the catfish was stripped into immobilizing solution containing 175 mM NaCl and 30 mM Tris at pH 7.8 and was successfully cryopreserved after a stepwise freezing procedure. After stepwise thawing, motility of spermatozoa was slightly lower than that of fresh sperm. Batches of 40-80 eggs were fertilized with cryopreserved spermatozoa, after thawing and activation in solution containing 50 mM NaCl, 20 mM Tris and HCl at pH 7.8; this resulted in 62.2% fertilization success, compared to 70.6 % with fresh sperm.

• 한국발생생물학회지:발생과생식
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• 제19권3호
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• pp.153-161
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• 2015

For the 2 years of farming, at the indoor circulating aquaculture system, four kinds of skeletal deformities were found among 60 Far Eastern catfish, Silurus asotus. Deformities saw jawbone's luxation, abnormality of upper lip and malocclusion. Spinal deformity was most fatal deformities with low weight and small length. Jawbone's luxation had 1 maxilla and 2 mandibles. Abnormality of upper lip had just lip was back over. Malocclusion's left maxilla and right maxilla were not balanced. This experiment was any deformities in this species through the deformity can grasp how it affects.

• 한국양식학회지
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• 제14권2호
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• pp.67-71
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• 2001

Phosphorus is an essential element for growth and metabolism in fish. However high levels of phosphorus in the feed can lead to poor water quality of pond, and can also be a potential source of pollution, when pond water is released to the environment. In this study phosphorus supplemented diets containing 0.0, 0.9 or 1.9% of (dicalcium) phosphate were offered to channel catfish and changes in water quality of ponds and phosphorus levels in fish were measured. Higher level of (1.9%) supplementation of phosphorus in diet resulted in higher concentration of T-P and SRP in pond waters. Also it produced negative effects on fish production by lowering feed coefficient and rate of increment in body weight. Surplus phosphorus can affect fish growth and water quality of pond.

• 한국어업기술학회:학술대회논문집
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• 한국어업기술학회 2003년도 춘계 수산관련학회 공동학술대회발표요지집
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• pp.225-226
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• 2003

Catfish (S. asotus) and bullhead (P. fulvidraco), economically important aquacultural species, belonging to order Siluriformes including two family Siluridae and Bagridae, respectively, are considered to be closely related to each other by various authors. Two fish species widely inhabit the slow river and stream that flows to the West Sea and South Sea in the Korean Peninsula. (omitted)

• 한국어업기술학회:학술대회논문집
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• 한국어업기술학회 2000년도 춘계수산관련학회 공동학술대회발표요지집
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• pp.282-283
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• 2000

The egg development of various fishes is studied by various methods including electron microscopy(Matsuyama et al, 1991) and hormone treatment(Schoonbee et al. 1980). In addition to attempt to induce final maturation and spawning, the present experiments were conducted to investigate the influence of hCG upon reproductive cycles in catfish(Silurus asotus) with developing gonads and to stimulate the reproductive system during the rapid phase of gonadal development. (omitted)

• 수산해양교육연구
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• 제27권5호
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• pp.1364-1368
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• 2015

This study was performed to evaluate mineral contents of catfish Silurus asotus. As a result of mineral content, the mean content of the macro mineral was (in descending order): K (310.36-412.66 mg/100 g), P (186.42-223.02 mg/100 g), Na (35.32-57.87 mg/100 g), Mg (22.88-31.87 mg/100 g), Ca (9.05-13.07 mg/100 g). In comparison, the mean content of the micro mineral was (in descending order): Fe (0.26-0.95 mg/100 g), Zn (0.26-1.02 mg/100 g), Cu (ND-0.08 mg/100 g), Mn (0.01-0.03 mg/100 g). A proportion of mineral intakes with the dietary reference intakes for Koreans (KDRIs) set by the Korean Nutrition Society. Nutrient uptake proportion of mineral intakes was (in descending order): P (62.16%), K (20.71%), Mg (16.82%), Fe (13.02%), Zn (11.38%) Cu (10.94%), Na (6.59%), Ca (3.09%), Mn (0.96%). The mineral content was compared with the major protein food sources according to the Korea Health Statistics (2013) such as polished rice, pork, chicken, beef, eggs and milk. The calcium content contains; lower level of milk and eggs, chicken whereas higher levels of rice, pork and beef. Catfish has less iron content than major protein food source. Phosphorus and potassium contain higher level of major protein food sources.

• 한국응용과학기술학회지
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• 제26권1호
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• pp.1-9
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• 2009

Nowadays, Tra catfish fat is given attention as an appropriate material for biodiesel production in Vietnam. The aim of this work is to investigate the optimal conditions of refining biodiesel and recovering glycerin by the transesterification from Tra catfish fat using KOH catalyst. As our results, the yield of transesterification was achieved to 94.17% at $50^{\circ}C$ for 45 min with 6:1 molar ratio of methanol to fat in the presence of 0.8% KOH catalyst, and wherein the biodiesel was refined by washing with distilled water at $70^{\circ}C$ and dried in a microwave oven. The yield of raw glycerin recoveries from the transesterification process was 78.58%. The purity of raw glycerin was 84.14% by the conditions of neutralization state with $H_{3}PO_{4}$ solution (pH = 5), $70^{\circ}C$, and 60 min. Activated carbon (3.0 wt.%) was used for the bleaching process at $80^{\circ}C$ for 20 min. The biodiesel was obtained in accordance with for ASTM D 6751 (biodiesel standard). The ash and water of raw glycerins were 7.32 and 8.01%, respectively, and implied that the raw glycerin is very promising candidate to be used as a raw material for textile and cosmetic industries.

• 한국어류학회지
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• 제11권2호
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• pp.126-133
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• 1999

무지개송어 (Oncorhynchus mykiss), 메기 (Silurus asotus) 그리고 미꾸리 (Misgurnus anguillicaudatus)의 성숙 난자의 방사대 (zona radiata) 및 난문의 미세구조적 특징을 광학, 주사 및 투과 전자현미경을 이용하여 조사하였다. 무지개송어와 메기의 난에 있는 난문은 깔대기 형태의 전정과 방사대를 통과하는 끝이 작아지는 통로로 구성되어 있었다. 무지개송어와 메기의 난문은 편평한 구멍과 긴 통로로 구성된 구조를 나타내었다. 메기 난문의 구조는 무지개송어 난문의 구조와 일치되었다. 무지개송어의 난문을 구성하는 내부 벽은 시계방향(우선형)의 구조를 나타내었다. 미꾸리의 난문은 짧은 통로를 지닌 얕은 구멍을 가진 형태를 나타내었고, 시계방향의 반대방향으로 난문의 벽은 방향성율 나타내었다. 미꾸리의 이러한 나선형의 방향은 무지개송어의 방향과 일치하지 않는 것으로 나타내었다. 개구부 바로 주변부에 있는 표면은 실험에 이용된 3가지 어류에서 모두 여러 가지 크기의 작은 구멍이 존재하였다. 상호 연결부위 (ridge)가 모든 어류의 미수정된 난자에서 관찰되었다. 본 논문에서는 난성숙시 난막과 난문의 형태를 알아보기 위해서 3가지 양식어종 난자의 표면형태와 난문의 미세구조를 상호 비교하였다.

• 한국어병학회지
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• 제9권1호
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• pp.87-93
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• 1996

한국산 메기(Silurus asotus)에 $\beta$-glucan을 복강내에 접종한 후, 경시적으로 말초혈액중의 호중구의 수와 PAS반응의 변화, 호중구의 탐식능 및 혈청중의 리소자임의 활성변화를 지표로 비특이적방어능력의 증강유무를 조사하였다. 글루칸의 투여후 말초혈액중의 호중구수를 증가시켰으며 투여회수에 따라 2회 접종한 경우 호중구의 증가가 지속되는 기간이 1회 접종어보다 길게 나타났다. 그러나 호중구의 PAS반응에는 변화가 없었다. 또 탐식율도 현저하게 증가하였지만 탐식지수는 변화가 없었다. 리소자임의 활성은 2회 접종시만이 현저히 증가하였으나 1회 접종시에는 활성의 증가가 없었다. 그러므로 $\beta$-glucan의 투여는 말초혈액중의 호중구수와 탐식능의 증가 및 리소자임 활성의 증가등 비특이적방어인자의 활성을 증가시켜 어체를 방어하는 능력을 증강시키는 것임을 알 수 있다.