• Fisheries and Aquatic Sciences
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• 제1권1호
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• pp.79-81
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• 1998

To investigate the influence of originated host and water temperature on the infectivity and growth of Microcotyle sebastis, juveniles of Schlegel's black rockfish (Sebastes schlegeli) were exposed to the eggs of M. sebastis originated from. Schlegel's black rockfish and black rockfish (Sebastes inermis) at $10^{\circ}C$ and $10^{\circ}C$. There were significant differences between the two isolates in the infectivity of eggs, and the growth of worms. The growth of M. sebastis was significantly affected by water temperature, and worms grew faster in $20^{\circ}C$ than in $10^{\circ}C$.

• 한국어류학회지
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• 제32권2호
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• pp.70-77
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• 2020

최초 체중 3.09±0.02 g 조피볼락 치어에서 먹이원으로 냉동크릴 (FWK) 그리고 크릴분말 (KM) 첨가량 (0~40%)에 따라 6종 실험사료로 7주간 사육한 결과 최종 체중, 증체율, 사료효율 및 전어체의 일반성분 중 회분에서는 유의적으로 차이가 나타났지만, 생존율과 전어체의 일반성분 중 수분, 조단백질 및 지질에서는 유의적인 차이 없이 유사하였다. 사육실험 후 크릴 첨가 먹이 종류에 따른 최종 체중은 7.4~12.0 g, 증체율은 141~286%로 먹이 종류에 따라서 유의적으로 성장 차이를 나타내었다. 사료효율은 36~72%로 성장처럼 유사한 경향을 보였다. 크릴을 첨가하지 않은 대조구에서는 12.0 g으로 FWK10구에서 9.3 g과 유의적으로 유사한 최종 체중을 나타내어 다른 시험구보다는 높은 최종 체중을 나타내었다. 즉, FWK 20% 이상 및 크릴분말 0%, 10%, 20%구에서는 7.4~7.8 g으로 유의적으로 낮게 나타났다. 냉동크릴구에서 냉동크릴 무첨가구와 유사하거나 냉동크릴 및 크릴분말 함유량에 따라 유의적으로 낮은 전어체 회분 함량을 나타내었다. 또한 FWK20KM20구에서 어분으로 단백질 함량을 높여주어도 성장, 사료효율 및 전어체의 일반성분에서 차이가 나지 않았다. 이상의 결과로 조피볼락 치어 사료에 냉동크릴 및 크릴분말 10~40% 첨가 시 성장, 사료효율 및 생존율 향상에 효과가 없었다. 그러나 냉동크릴만 10% 첨가 시에는 어분만을 첨가한 사료와 유사한 양호한 성장, 사료효율 및 생존율을 나타내었다.

• 한국수산과학회지
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• 제49권2호
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• pp.146-153
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• 2016

A feeding experiment was conducted to determine the nutritional value of various dietary protein sources without a vitamin premix supplementation in juvenile black rockfish, Sebastes schlegeli. Diets containing similar quantities of lipid and carbohydrate with 50% crude protein from fish meal (FM)/soybean meal (SBM)/corn gluten meal (CGM), FM only, casein/gelatin, high FM/low casein and low FM/high casein were fed to rockfish along with a commercial rockfish diet. The diet containing only 65.6% FM and the commercial rockfish diet produced significantly greater weight gain (WG) and feed efficiency (FE) than all other semipurified diets (SPDs); the economical diet with 52.8% FM, 10% SBM and 5% CGM produced lower WG than the diet containing FM and commercial rockfish diet, but FE and survival were similar both diets. Intermediate responses were observed for rockfish fed the SPD containing 32.8% FM and 27.4% casein, while SPDs containing 10% FM and 41.8% casein and 38.5% casein and 10% gelatin yielded the lowest WG and FE. Some differences in tissue indices and body composition of rockfish were induced by the diets containing various protein sources and levels without the vitamin premix supplementation.

• 한국환경보건학회지
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• 제29권1호
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• pp.16-18
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• 2003

Seven specimens of Sebastes melanops, black rockfish and three of S. maliger, quillback rockfish, were collected from Oregon Coast Aquarium during the period of September 19 to November 5, 2001 and examined for parasites. One monogenean helminth species and parasitic copepod species were recorded from black and quillback rockfishes, respectively. A total of 26 parasites were collected: 16 Microcotyle sebastis from the gill filaments of black and quillback rockfishes and 10 Clavella adunca were found in the fins of black rockfish. The prevalence of Microcotyle sebastis was 40.0%, and intensity of infection was 2.0(1-11). With regard to Clavella adunca, the prevalence and intensity were 20.0% and 1.4(2-8), respectively.

• 한국발생생물학회지:발생과생식
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• 제19권2호
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• pp.85-96
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• 2015

Measurements of closely related sets of classical and truss dimensions were analyzed to discriminate species of scorpaenidae including the dark banded rockfish, Sebastes inermis, the black rockfish, S. schlegeli, and gobioninae including the striped shiner, Pungtungia herzi, and the slender shiner, Pseudopungtungia tenuicorpa. The measurements of the dimensions were arc sin square root transformed, and compared as a function of the standard length of each species for statistical analysis. For values of the classical dimensions of the rockfish, 6 were greater for the dark banded rockfish than for the black rockfish, 1 value was smaller for the former, and for 2 values there was no statistically significant difference (P > 0.05). For values of the classical dimensions of the shiners, 9 values were greater for the striped shiner than for the slender shiner, 2 values were smaller for the former, and for 1 value there was no statistically significant difference (P > 0.01). For values of the truss dimensions of the rockfish, 6 were greater for the dark banded rockfish than for the black rockfish, 1 was smaller for the former, and for 4 values there was no statistically significant difference (P > 0.05). For values of the truss dimensions of the shiners, 13 values were greater for the striped shiner than for the slender shiner, 3 values were smaller for the former, and for 6 values there was no statistically significant difference (P > 0.01). The dimension sets used in this study may be useful as taxonomic indicators for discriminating among fish species in Korea.

• 한국임상수의학회지
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• 제23권3호
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• pp.236-242
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• 2006

Along with olive flounder(Paralichthys olivaceus), black rockfish(Sebastes schlegeli) is another very popular maricultured species in Korea. As there is many difficulties in handlling live fish for aquaculturist, use of suitable anesthesia for proper handling of fish is very important in the field. In this view, the effect of $AQUI-S^{\circledR}$ has analysed for its use in the field. $AQUI-S^{\circledR}$, contains 50% isoeugenol, is a new anesthics for fish and zero-withdraw time required since it was approved as a safe additives of food. In the present study, black rockfish adult exhibted sedation effect from 5 ppm at $10^{\circ}C\;and\;15^{\circ}C$, and 7.5 ppm at $20^{\circ}C$, on the other hand, anesthesia was at least required 7.5 ppm at $10^{\circ}C\;and\;15^{\circ}C$, and 10 ppm at $20^{\circ}C$. The fish was recovered from sedation and anesthesia after approximately 5 and 10 minutes, respectively. In case of black rockfish fry, sedation was recorded from 2.5 ppm at $20^{\circ}C$, and 5 ppm at $15^{\circ}C\;and\;20^{\circ}C$. The least concentraion of anesthesia was 2.5 ppm at $10^{\circ}C$, 7.5 ppm at $15^{\circ}C$, and 5 ppm at $20^{\circ}C$. The acute toxic test showed that black rockfish adult and nv showed mortality above 12.5 and 15 ppm concentration of $AQUI-S^{\circledR}$, respectivly. In sum, $AQUI-S^{\circledR}$ is considered as useful anesthetic drug for sedation and anesthesia of black rockfish, it is highly availbale to be prevented from a varity of stress.

• 한국어병학회지
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• 제20권2호
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• pp.99-108
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• 2007

본 연구는 V. harveyi의 luminescence 유무와 해수 어류에 대한 병원성의 관계를 알아보고자 non-luminous V. harveyi 와 luminous V. harveyi 분리 균주로 조피볼락에 대한 병원성 시험을 시행하였다. 시험 균주 V. harveyi 모두 haemolytic activity를 나타내었으며, 어체 내 생존능은 non-luminous V. harveyi 분리 균주 FR 2가 강한 생존능을 나타내었다. 또한 조피볼락에 인위 감염시, non-luminous V. harveyi 분리 균주 FR 2가 강한 병원성을 나타내었으며 luminous V. harveyi 분리 균주 VIB 391은 낮은 병원성을 나타내었다. 결론적으로 조피볼락에서는 non-luminous V. harveyi 분리 균주 FR 2가 강한 병원성을 나타내었으며 luminous V. harveyi 분리 균주 VIB 391은 매우 약한 병원성을 나타내어 luminescence의 유무에 따라 해수 어종에 대한 병원성의 차이가 있을 것으로 생각된다

• 한국수산과학회지
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• 제49권2호
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• pp.224-233
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• 2016

The objective of this study was to develop an artificial neural network (ANN) model for the acoustic identification of commercially important fish species in Korea. A broadband echo acquisition and processing system operating over the frequency range of 85-225 kHz was used to collect and process species-specific, time-frequency feature images from six fish species: black rockfish Sebastes schlegeli, black scraper Thamnaconus modesutus [K], chub mackerel Scomber japonicus, goldeye rockfish Sebastes thompsoni, konoshiro gizzard shad Konosirus punctatus and large yellow croaker Larimichthys crocea. An ANN classifier was developed to identify fish species acoustically on the basis of only 100 dimension time-frequency features extracted by the principal components analysis (PCA). The overall mean identification rate for the six fish species was 88.5%, with individual identification rates of 76.6% for black rockfish, 82.8% for black scraper, 93.8% for chub mackerel, 90.6% for goldeye rockfish, 96.9% for konoshiro gizzard shad and 90.6% for large yellow croaker, respectively. These results demonstrate that individual live fish in well-controlled environments can be identified accurately by the proposed ANN model.

• 한국수산과학회지
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• 제34권2호
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• pp.151-155
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• 2001

해양 목장에서 음향 순치 대상 어종으로 사용할 수 있는 볼락의 청각 문턱치를 기본으로 하여 음향 어법의 기초 자료를 제공할 목적으로 볼락의 백색 잡음에 대한 청각 임계비와 학습 및 유집을 위한 방성 음압 강도를 조사한 결과는 다음과 같다. 음압 73, 78, 83dB의 3단계 백색 잡음을 방성하였을 때 볼락의 청각 문턱치는 백색 잡음이 없을 때보다 높게 나타나 마스킹 현상이 나타났고, 주파수 300Hz에서 보다 높게 나타났다. 볼락의 청각 임계비는 측정 주파수 80, 100, 200, 300, 500, 800Hz에서 음압이 대략 28, 34, 26, 30, 47, 52dB이고 마스킹 현상은 주파수 300Hz에서 음압 65dB의 잡음 레벨에서 나타나기 시작하였고 그 외의 주파수에서는 음압 68dB 이상에서 나타났으며, 볼락이 주파수 $200\~300$Hz에서 신호음을 인식하기 위해서는 음압 96dB 이상, 잡음 레벨보다 약 26dB 이상의 높은 음압이 요구되었다.

• 한국수산과학회지
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• 제33권6호
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• pp.581-584
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• 2000

제주 연안역에 서식하고 있는 볼락의 수중음에 대한 청각 특성을 파악하여 수중음에 대한 어군의 행동양상을 파악할 수 있는 기초자료를 제공할 목적으로 측정주파수 $80{\~}800 Hz$의 수중음과 8V의 직류 전압의 전기자극을 이용하여 음향 조건학습을 시킨 후 측정주파수와 음압을 임의로 변화시켜가면서 청각문턱치를 구한 결과 볼락은 측정주파수 $80{\~}800 Hz$의 음을 인식하고 있었고, 측정주파수에 대한 각각의 청각문턱치는 102 dB, 103 dB, 99 dB, 96 dB, l16 dB, 122 dB이었으며, 측정 주파수 300 Hz에서 음압 96 dB로 가장 낮고 측정 주파수 800Hz에서 음압 122 dB로 가장 높게 나타내고 있었다. 그러나 수중에 존재하는 소음의 주파수대역이 저주파에서 높게 나타나고 대역폭도 넓으므로 이들 자극이 어류 행동에 어떻게 미치고 있는지 규명할 필요가 있다고 판단된다.