• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.39 no.4
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• pp.269-275
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• 2003

In this paper, We examined auditory threshold and critical ratio of amberjack seriola dumerili, in the Jeju Island coastal waters, to find out hearing ability of the fish. The auditory threshold level, critical ratio and hearing index of amberjack were determinded by conditioning method using a sound coupled with electric shock in the condition of ambient noise or white noise in an experimental water tank. The audio-signals of pure tone and electric shock were from 80 HZ to 800 Hz and DC 7 V, respectively. Values for the critical ratios were calculated in terms of the masked thresholds using the noise projected to stable spectrum levels at all measurement frequencies of background noise. Masking noises were in the spectrum level range of 65 dB∼75 dB $(re 1{\mu}Pa\sqrt{Hz})$. The auditory thresholds of amberjack within the test the frequencies were most sensitive at 300HZ as 94.5 dB. The critical ratios of fishes ranged from 36.4 to 52.8 dB. The noise spectrum level that started masking was about 58∼72 dB within frequencies.

• 한국수산학회:학술대회논문집
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• 2005.05a
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• pp.188-189
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• 2005

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.33 no.4
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• pp.285-289
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• 1997

A Held experiment was carried out to confirm the effect of underwater sound on the luring of fish school of rudder fish in a set net at the coast of Cheju Island. The effects of the acoustic emission on the luring of fish school were observed at a cage around a set net fishing ground using a manufactured underwater speaker. Underwater sounds that were emitted for the luring of fish school were the pure sounds of which frequency were 300Hz and 400Hz, engine noise and swimming sound. The results of the observation are as follows : 1. The input and output wave forms of a manufactured underwater speaker in water tank were similar to those in measurement frequencies. The result of the observation indicated that it could be used for the purpose of the sound emission in measurement frequencies. 2. The effect of the emitted pure sound of 300Hz, 400Hz was remarkable for the luring of fish school in 2 minutes after the sound emission. The reaction of fish school was more sensitive to the pure sound of 400Hz than 300Hz. 3. The effect of the emitted engine noise was more remarkable than that of the pure sound for 3 minute continuously. On the feeding sound, fish formed a shoal and swimmed, but didn't gather around the underwater speaker. 4. The feeding and swimming sound spectra on rudder Hsh showed similar sound pressure distribution each other, they appeared low sound pressure in frequencies of 200-600Hz.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 1995.06b
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• pp.0.6-3
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• 1995

• Korean Journal of Ichthyology
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• v.9 no.2
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• pp.244-247
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• 1997

A specimen of carangid fish, Seriola rivoliana Valenciennes belonging to the family Carangidae was collected for the first time in Pusan, Korea. It was similar to Seriola dumerili (Risso) by appearance, but differed in some morphological characters having the deeper body, the higher lobes of the second dorsal and anal fins, becoming straight line below 23-24th ray of second dorsal fin, the configuration of the first haemal spine. A new Korean name "Nat Jaetbang-eo" is proposed for this species.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2002.05a
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• pp.55-56
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• 2002

• Korean Journal of Ichthyology
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• v.20 no.1
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• pp.28-35
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• 2008

Fishes by a set net in the coastal waters off Gwideuk, Jeju Island were studied to determine species composition and catch variation, 2004. The fishing period conducted by a set net in Gwideuk fishing ground were from April to December. A total of 45,473.2 kg including 21 species was caught during the survey period. Most of them consisted of fishes of 17 species and a few were cephalopods of 4 species. Dominant species were Trachurus japonicus and Siganus fuscescens, 44.3% in the total. And sub-dominant species were Sepioteuthis lessoniana, Seriola dumerili, Seriola quinqueradiata, Loligo bleekeri, Seriola lalandi accounting for 54.4%. Although the number of species had a tendency to decreased from July to December, the catch by a set net was higher in summer and autumn than in spring. Such catch variations were closely related to recruitment of dominant species and also the seasonal variation of fishing ground temperature.

• Korean Journal of Ichthyology
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• v.17 no.4
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• pp.248-254
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• 2005

Integumentary structure of the amberjack, Seriola dumerili, was examined by light and transmission electron microscopy. Integument of the amberjack consists of epidermal and dermal layers. The epidermal thickness is about $28.32{\mu}m$. The epidermal layer could be classified into superficial, intermediate, and basal layers by morphology and position of the supporting cells. Secretory cells of the epidermal layer were classified into mucous cells and club cells in the amberjack. Mucous cells contained acidic mucous and were alcian-blue positive with AB-PAS (pH 2.5) reaction. The club cells contained well-developed rough endoplasmic reticula and large central vacuole. Also, filament-rich cells were identified in the epidermal layer. The dermal layer consists mainly of collagenous fiber, and it contains fibrocytes and pigment cells. The cytoplasm of fibrocyte had a well-developed rough endoplasmic reticulum. The pigment cells contained electron-dense melanin granules.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2002.10a
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• pp.51-52
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• 2002

어류의 가청주파수는 16 ∼ 5,000 Hz 범위이며 주파수 100 ∼ 1000Hz 범위에서 가장 예민한 반응을 보인다. 수중 가청음은 어군의 행동을 제어하는 방법과 바다목장에서 음향순치 기술로 많이 응용되고 있다. 수중가청음에 의한 어류의 반응을 해석하기 위해서는 물고기의 청각능력을 정확히 파악해야 한다. 어류의 청각 능력을 측정하는 방법에는 청각 문턱치, 청각 임계비, 청각 능력지수, 주파수 변별능력, 음압 강도 변별 능력, 음원 정위 능력 등이 있다(이, 2000). (중략)

• Journal of the East Asian Society of Dietary Life
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• v.15 no.5
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• pp.566-573
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• 2005

본 연구는 작은 생선은 뼈째로 먹을 수 있지만 큰 생선은 생선뼈를 거의 이용하지 못하여 생선의 맥에 포함되어 있는 무기질을 유효하게 이용할 목적으로 유기산을 첨가해서 생선뼈 스프를 만들었을 때, 유기산의 종류와 가열시간이 뼈로부터 용출되는 칼슘, 인 함량의 변화에 대하여 조사하였다. 생선뼈에 함유되어 있는 수분과 무기질 함량은 생선뼈의 종류에 따라 달랐고, 큰 생선의 맥일수록 수분 함량은 감소하는 경향이었다. 유기산을 첨가하여 12시간 가열했을 때 스프에 용출된 칼슘은 잿방어뼈에 구연산, 사과산을 첨가하였을 때가 $61.34\%$와 $60.50\%$로 가장 많았고, 인의 용출도 칼슘과 같은 경향이었다. 칼슘과 인의 용출량은 참치뼈에 $4\%$의 사과산을 첨가하여 12시간 가열했을 때에 573mg, 78mg으로 가장 높았다. 참치뼈 스프의 칼슘과 인의 비율은 대조군에서는 칼슘보다 인의 용출$(0.21\~0.35)$이 많았으나, 유기산을 첨가하였을 때는 칼슘의 용출$(0.98\~10.86)$이 많았다. 단백질과 총 유리아미노산의 용출은 대조군보다 유기산을 첨가하였을 때가 증가하였다.