• 한국어류학회지
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• 제13권1호
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• pp.32-39
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• 2001

대천 해빈 쇄파대에서 1990년 8월 사리와 조금 때 2시간 간격으로 24시간 동안 어류를 채집하여, 조차, 조위 밤낮에 따른 어류 종조성의 단기 변동을 분석하였다. 채집된 어류는 총 24종으로, 부어류의 유어들이 양적으로 많았고, 사리 간조 때에는 저어류의 유어들도 출현하였다. Wilcoxon의 signed-rank test 결과 사리 때가 조금 때에 비하여 유의하게 많은 양이 채집되었다. 사리 때에 는 만조 때에 비하여 간조 때 유의하게 많은 어류가 채집되었으나, 조금 때에는 간조와 만조 때 유의한 차이를 보이지 않았다. 부어류들의 평균 개체수는 사리와 조금 때 유의한 차이를 보이지 않았지만, 대부분의 저어류들은 사리 간조 때에 유의하게 많이 잡혔다. 채집된 대부분의 저어류들은 사리 간조 때 대부분 채집되어, 저어류들은 대부분이 조금 때 간조선 보다 깊은 곳에 서식하는 것을 알 수 있다.

• 수산해양기술연구
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• 제34권2호
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• pp.174-184
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• 1998

In order to accumulate fundamental. data for control of fishes’ behavior at the real fishing ground, the fitness of the numerical model for describing the behavior of fishes was examined by the marine fish. Mullet, Mugil cephalus were used as experimental fishes. The numerical model of fishes’ behavior presented in our earlier paper was modified on the vertical movement of fish school. For the comparision of parameters of the modified numerical model between mullet and rainbow trout, the estimated values of parameters were identified with dimension. The fitness of the modified numerical model was examined by the comparision between experiment and simulation on the several indexes represented by fishes’ swimming characteristics. The obtained result are summarized a follows : 1. The non-dimensional parameter a’ of propulsive force and kb’ of interactive force by the experiment without model net showed a similarity, but the non-dimensional parameter k sub(c’) of schooling force for rainbow trout was lager than one for mullet and the non-dimensional parameter k sub(w’) of repulsive force for mullet was lager than one for rainbow trout. 2. The non-dimensional parameter a’ and k sub(b’) for rainbow trout by the experiment with model net were a little lager than ones for mullet, but non-dimensional parameter k sub(c’) and k sub(w’) for mullet were lager than ones for rainbow trout. 3. The non-dimensional parameter k sub(c’) and k sub(b’) showed the largest and the smallest value among the non-dimensional parameters for rainbow trout and mullet, respectively. 4. The fitness of the modified numerical model was confirmed by means of the compulsion between experiment and simulation on the swimming trajectory of fishes, the mean distance of individual from wall, the mean swimming speed, the mean swimming depth and the mean distance between the nearest individuals. Especially, the similarity of mean swimming depth was improved by using the modified numerical model.

• Fisheries and Aquatic Sciences
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• 제10권1호
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• pp.43-52
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• 2007

The relationships among long-term climatic change in the southern part of the Korean peninsula, oceanic conditions of the South Sea, Korea, and winter catches of major small pelagic fishes were analyzed using 33 years of time-series data from 1971-2003. In the early 1990s, winter climatic conditions in the southern part of the Korean peninsula shifted to a warmer regime with higher air temperature, weaker wind speed, and lower relative humidity. Also, winter sea surface temperature (SST) became consistently higher in the South Sea. The annual catch of major small pelagic fishes in the South Sea increased dramatically in the mid 1990s, whereas the catch of total fishes decreased in the late 1980s. In particular, the winter catch started to increase markedly in the late 1980s, and has remained over 120,000 M/T since the late 1990s. Correlation analysis of the winter catch of major small pelagic fishes and environmental factors showed that catch was correlated with air temperature (r=0.468, P< 0.01), wind speed (r=-0.732, P< 0.01), relative humidity (r=-0.73l, P< 0.01), and SST (r=0.672, P< 0.01). Multiple regression analysis between the winter catch of major small pelagic fishes (Y) and environmental factors (X) resulted in the equation: $Y=-0.017-0.217\;X_3-0.486\;X_4+0.325\;X_5(R^2=0.754,\;P<0.000)$.

• 수산해양교육연구
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• 제21권3호
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• pp.451-458
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• 2009

The purpose of this study is to analyze the nutrition composition and physiological changes, and to evaluate the food quality of live fish in cultured and wild fishes which have been kept in an aquarium tank. The moisture and lipid content of wild and cultured fishes when kept in an aquarium tank for seven-days storage was found to be lower than those of the initial stage storage(zero day). The breaking strength was also rapidly decreased in all of live fishes tested in this study as the periods of storage extended. The protein content did not differ significantly. However, the content of cortisol, which is a indicator indicating a stress reaction in tissues, was apt to increasing as the periods of storage extended. The cortisol content of wild fishes were higher than those of cultured fishes. On the other hand, the activity of activities of alanine aminotransferase (ALT) and aspartate aminotransferase (AST), which is also a indicator indicating a stress reaction, were not changed in the serum of wild and cultured fish, suggesting the ALT and AST activity dose not directly related with a healthy loss originated from stress. The death ratio of wild fishes were higher than cultured ones due to limited activity and stress during the storage in a aquarium tank.

• Fisheries and Aquatic Sciences
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• 제26권5호
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• pp.318-335
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• 2023

It is important to understand the biological aspects of fish for fishing management. This study was conducted from February through October 2021. A total of 1,629 fishes were collected using different fishing gears. The length-weight relationship is a power curve for all fishes and showed a significant (r² > 0.8). All fishes revealed a negative allometric growth pattern except Labeobarbus intermedius. Oreochromis niloticus (1.714 ± 0.009) was found in better condition than other fish species (analysis of variance [ANOVA], p < 0.05). The length at maturity was 24.0 cm and 25.4 cm total length (TL), 28.9 cm and 28.2 cm fork length, and 53.2 cm and 57.5 cm TL for females and males of O. niloticus, L. intermedius and Clarias gariepinus, respectively. Fecundity was ranged between 100-947 eggs/g with absolute fecundity (AF) of 468-3,832 eggs, 200-1,000 eggs/g with AF of 2,752-136,420 eggs, and 505-900 eggs/g with AF of 2,000-6,404 eggs for O. niloticus, C. gariepinus, and L. intermedius, respectively. Their respective mean fecundity was 1,490 ± 91, 23,330 ± 5,070, and 3,096 ± 273 eggs, respectively. Mean fecundity revealed a significant variation between size classes and species (ANOVA, p < 0.05). The fecundity length and fecundity-body weight relationships except (O. niloticus) of fishes were curvilinear while the gonad weight (GW)-fecundity relationship was linear for all fish species. The fecundity was moderately associated with increasing length than body weight, and GW for all fishes (r² > 0.6). In conclusion, a tangible management setup is required to sustain the use of fish in the reservoir.

• 한국식품영양과학회지
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• 제15권3호
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• pp.213-221
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• 1986

점고등어를 $0^{\circ}C$에서 예비저장(豫備貯藏)하지 않은 것과 4일(日), 7일간(日間) 예비저장(豫備貯藏)하여 초기선도(初期鮮度)를 다르게 한후(後) $-3.5^{\circ}C$에서 PF저장(貯藏)한 경우와 $-20^{\circ}C$에서 동결저장(凍結貯藏)한 경우의 선도유지효과(鮮度維持效果)를 조사(調査)한 결과(結果)는 다음과 같다. 1) 생선(生鮮) 피부 $1cm^3$당의 세균수(細菌數)는 PF저장(貯藏) 초기(初期)부터 예비저장일수(豫備貯藏日數)가 길수록 빠른 속도(速度)로 증가하였으나 동결저장(凍結貯藏)에서는 저장(貯藏) 36일(日)까지 세균수(細菌數)가 감소하였다. 2) K치(値)의 변화(變化)는 PF저장(貯藏)에서 저장초기(貯藏初期)부터 K치(値)의 상승(上昇)이 빠르게 진행되었으나 동결저장(凍結貯藏)에서는 K치(値)의 상승(上昇)이 느리게 진행되었으며 예비저장구(豫備貯藏區)의 시료(試料)는 대조구에 비해 전(全) 저장기간(貯藏期開)동안 $7{\sim}15%$ 높은 값을 나타내었다. 3) 휘발성질소함량(揮發性窒素含量)은 초기선도(初期鮮度)에 른 관계없이 PF저장(貯藏)에서 $20{\sim}30mg/100g$까지 증가하였으나 동결저장(凍 結貯藏)에서는 저장초기(貯藏初期)에 증가현상을 보였으나 저장(貯藏) 20일(日) 이후(以後)에는 20mg/100g 정도로 거의 일정치(一定値)를 나타내었다. 4) 유출(流出) drip는 빙장(氷藏)한 경우 $3{\sim}5%$였으며 동결저장(凍結貯藏)에서 약 $10{\sim}15%$였으나 PF저장(貯藏)에서는 $10{\sim}26%$로 가장 많았으며 total drip는 PF저장(貯藏)과 동결저장(凍結貯藏)에서 비슷하였다. 예비저장일수(豫備貯藏日數)와 유출(流出)drip는 PF저장(貯藏)과 동결저장(凍結貯藏) 모두 4일간(日間) 예비저장(豫備貯藏)한 시료(試料)에서 가장 많았다.

• 약학회지
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• 제17권1호
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• pp.41-43
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• 1973

Trace-amounts of Diptered and DDVP in fishes could be separated and identified by thin layer chromatography and gas chromatography with DEGS-H$_{3}$PO$_{4}$ column.

• Parasites, Hosts and Diseases
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• 제21권2호
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• pp.205-208
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• 1983

Ptychebcthrium nayarensis n. sp. has been described from two hill-stream fishes, Barilius bola (Ham.) and Schizotheras rirhardsonii (Gray) at 325~750 mASL. The new species has beeen compared with close species. Taxometric evaluation of the new species has been done on available data.

• 한국환경복원기술학회지
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• 제17권2호
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• pp.61-71
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• 2014

A river fishway is a hydraulic structure enabling fish to overcome stream obstructions such as dams and weirs. The main aim of this paper is to investigate the collectibility of upstream-migrating fishes and hydraulic problems in pool-and-weir type fishway which has been established for upstream-migration at Namgang weir in the downstream of Namgang dam, and to grope for improvement measures which pool-and-weir type fishway can be switched to pool-and-partial weir type fishway through hydraulic field experiment. Exsisting fishway had problems which upstream-migrating fishes can not take a rest due to the seiche and vortex phenomena in pools and migrate to upstream because of height difference in entrance pool. In order to prevent hydraulically the seiche and vortex phenomena and establish rest area for fishes in each pool, we carried out hydraulic field experiments. In the fishway, it was to improve pool-and-weir into pool-and-partil weir, to decrease the height difference in entrance pool, and to reduce oriffice velocity of each pool. Also, we investigated fishes collectibility of after improving fishway for 6 days in September 2013. To resolve chronic problems(seiche-vortex phenomena and rest area for fishes), as weirs were remodeled into partial weir only which central part of weirs was part of non-overflow weir, we confirmed results that pool-and-weir type fishway could be switched to efficient pool-and-partial weir type fishway with relatively simple construction and low cost. Type-B which has the closed oriffices and the parts of non-overflow has the ideal conditions, but this conditions are limited to fishway of Namgang weir used in this study. Representative Ice-habor type fishway is pool-and-partial weir type fishway which has together parts of overflow and oriffices, and has excellent ability of upstream-migration. To switch from pool-and-weir type fishway to pool-and-partial weir type fishway, the size of oriffice has to be regulated by the discharge of fishway and the dimension on parts of non-overflow and overflow in weirs. Entrance pool is important facility which upstream-migrating fishes have to not only be collect but also charge with energy. In this study, entrance-pool is temporary and roughly-built, but fishes gather together more than the case of no entrance-pool. In the case of fishway which was protruded to downstream, as entrance of fishway turns toward or parallels to weir, the collectibility of fishway was excellent by attraction water.

• Journal of Nutrition and Health
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• 제34권7호
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• pp.809-820
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• 2001

The purpose of the study was to find out the rich sources of vitamin B-complexes in Korea. Thirty kinds of vitamin B-complex (thiamin, riboflavin, and niacin) rich foods were selected based on vitamin content in 100g edible portion, single serving size, 100kcal energy content, and 1999 national annual food supply data. The results were summarized as follows: \circled1 Most of the thiamin rich foods selected were fishes: half of the foods selected was fishes when based on the contents in single serving size. On the other hand, about half of the foods selected were vegetables when based on the thiamin contents in 100kcal energy content. A relatively large number of food groups were included such as fishes, vegetables, beans, grains, meats, etc. when based on the contents in 100g edible portion, and national food supply data. \circled2 Most of the riboflavin rich foods selected were fishes and shellfishes, and vegetables: half of the foods selected were fishes and shellfishes when based on the content in 100g edible portion; two-thirds of the foods selected were vegetables when based on the content in single serving size; half of the foods selected were vegetables when based on the content in 100kcal. \circled3 The most important niacin sources are fishes: Most than 60% of the foods selected were fishes when based o the 100g edible portion, single serving size, and 100kcal energy content. Laver is very important source of all 3 vitamin B-complexes in Korea when based on the content in 100g edible portion, 100kcal energy content, and national annual food supply but not in single serving size. On the other hand, rice is rice is sources of all 3 vitamin B-complexes when based on the national annual food supply, but not in single serving size. On the other hand, rice sources of all 3 vitamin B-complexes when based on the national annual food supply, but is not included in 30 rich foods selected based on the content in 100g edible portion, single serving size, and 100kcal energy content. Mushrooms are also very important food sources of thiamin, riboflavin, and niacin when based on the vitamin content in 100g edible portion, single serving size, and 100kcal energy content but not included in 10 rich food selected based on the national food supply data.