• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.409-410
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• 2001

태평양 해 역은 1985∼1997년간 우리나라 연승어업에 의한 다랑어류 평균 어획량의 55％를 차지하는 중요한 해역으로 눈다랑어와 황다랑어가 전체 어획량의 82.2％ 차지 하고 있다. 따라서 다랑어 연승어업의 중요 어장인 태평양 해역에 대하여 서부∼동부 해역의 적도 주변에서 한국 다랑어 연승어업에 의해 주로 어획되는 황다랑어와 눈다랑어를 대상으로 풍도 변동, 연직분포, 어획 적수온, 수온 변동에 따른 분포 특성 등을 밝혀 동 해역에서 조업하는 다랑어 연승어업의 과학적인 어장 정보 제공과 다랑어류 자원의 효율적 이용 및 관리에 기여하고자 한다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.10a
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• pp.285-286
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• 2000

한국 다랑어 선망어업은 1980년 서부태평양 열대해역에서 가다랑어 및 황다랑어를 대상으로 조업을 시작하여 1986년 이후 본격적인 조업이 이루어지고 있다. 1995년 이후 26∼30척이 조업을 하여 140,000∼200,000톤 사이의 비교적 안정된 어획량을 유지하고 있으나 약간의 연별 변동을 보이고 있다. 이러한 연별 변동은 한국 다랑어 선망어업의 주 대상종인 가다랑어 및 황다랑어가 고도회유성 어종으로 이들의 회유, 산란, 섭이 등은 어장환경 변동에 영향을 받기 때문으로 추정된다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2003.05a
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• pp.291-292
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• 2003

한국 다랑어 연승어업은 1957년 인도양, 1958년 태평양에서 각각 시험조업을 실시한 이후 1960년대 중반부터 실질적인 조업이 시작되었다. 태평양 해역은 1985∼1997년간 한국 연승어업에 의한 다랑어류 년 평균 어획량의 55%를 차지하는 중요한 해역으로 눈다랑어와 황다랑어가 한국 전체 어획량의 82.2% 차지하고 있고, 이중 황다랑어는 20∼40%를 차지하고 있다. (중략)

• Korean Journal of Fisheries and Aquatic Sciences
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• v.30 no.5
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• pp.719-729
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• 1997

Stomach contents of bigeye tuna, Thunnus obesus, and yellowfin tuna, Thunnus albacares, caught by longlining in the western tropical Pacific were analyzed to examine their foods and to compare their feeding behavior. The food species of both bigeye and yellowfin tunas were primarily fishes, crustaceans, and cephalopods. A total of 15 fish, 6 crustacean, and 1 cephalopod species were identified from their stomach contents, of which lantern fish (Myctophum sp.) was the most important food for both tuna species. No significant differences in species composition of food items between bigeye and yellowfin tunas were observed, indicating that in the same habitat the tunas have a similar feeding behavior. However, while they showed a remarkable similarity in diet composition, significant quantitative differences on the basis of IRI values were observed in several diet species, such as Myctophidae, Alepisauridae, Oplophoridae, Gammaridae, and Onychoteuthidae.

• Korean Journal of Ichthyology
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• v.20 no.2
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• pp.105-111
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• 2008

A pelagic tuna longline research cruise in the eastern and central Pacific Ocean from September to October of 2006 was conducted to compare catch rates with the use of different hook type and bait combinations. Traditional tuna hooks (J 4) and three circle hook types (C15, C16, C18), along with five bait types (chub mackerel (CM), jack mackerel (JM), milkfish (MF), sardine (SD), and squid (SQ)) and hook number as a proxy for hook depth were evaluated for their effect on bigeye tuna catch rates (fish per 1,000 hooks) using Generalized Linear Models (GLMs). Results from 28 sets indicated significant differences in bigeye catch rates between individual longline sets and hook number. The GLM explained 33% of the deviance in bigeye catch rates with these two factors. An alternative model formulation included bait type which had a small effect (explaining 2.7% of the deviance) on catch rates. Hook type had a negligible and non-significant effect in the GLMs. These results indicate that all of the hooks and baits tested are equally effective at catching bigeye tuna and that hook number (depth) was the paramount operational factor in explaining bigeye tuna catch rates.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.350-351
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• 2000

선망어업에 의해 어획되는 다랑어 어군은 연승어업과는 달리 주로 표층에서 유영, 이동, 또는 섭이하는 가다랑어나 황다랑어 무리로 이들의 분포 특성을 감안하면, 해수의 표층수온 등 해양환경 변화는 선망어업의 어획량, 단위노력당어획량 및 종조성등에 상당한 영향을 미칠 것으로 추정된다. 한편, Lehodey (1997)는 미국의 선망어획자료를 이용하여 엘니뇨가 가다랑어의 분포에 직접적인 영향을 미친다고 발표한 바 있다. 본 논문에서는 국립수산진흥원에서 1995-1998년간 한국 다랑어 선망어선으로부터 수집한 어획 자료를 이용하여 최근의 해양환경 변동에 따른 한국 선망어업의 어장변동 및 조업특성에 대해서 서술하고자 한다. (중략)

• Korean Journal of Fisheries and Aquatic Sciences
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• v.15 no.4
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• pp.317-322
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• 1982

The biting behaviors of tuna were studied based on the remains of saury (Cololabis saira), which was used as bait, in the stomach contents of tuna. The saury remains were classified into four segmental groups (A-segment: Whole fish; B-segment: anterior partion with head: C-segment: middlepart without both head and tail: D-segment : posterior part without head). The tuna stomachs were independently named and grouped into three subsamples according to bait segments remaining in the stomach. The subsamples have the extra number of the stomach-naming segments and the distributions of the bait tegments are biased from tile random distribution. The distribution of the bait segments except the extra segments are hypothetically assumed to be random, and was subjected to the chi-square test of significance. The inferred conclusions are as follows:1. Most of the tuna having the B-segment had previously taken the C and/or D-segment. 2. The catchability of the yellowfin tuna having the B-segment seems higher than that of the fish having the A-segment in the stomach. 3. Tuna which had two or more bait heads should have taken the extra bait heads without being hooked detaching the head from the hook by biting the Posterior porting of tile bait.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.33 no.1
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• pp.38-42
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• 2000

Thig study was conducted to get a knowledge on chemical components of the cooked tuna bones (skipjack tuna bone and yellowfin tuna bone) as a food resource. The crude protein of tuna bone was around $29{\%}$ on the dry basis. The imino acid content (193 imino acid residues /1,000 amino acid residues) of collagen extracted from yellowfin tuna bone was higher than that (173 imino acid residues /1,000 amino acid residues) of collagen extracted from skipjack tuna bone, however, it was lower than that of collagen extracted from animal bone. The content and the ratio of unsatuated fatty acids in lipid extracted from yellowfin tuna bone were higher than those of lipid extracted from skipjack tuna bone, but they were lower than those of squid viscera oil. The contents of calcium and phosphorus as the major components of the tuna tone were 36.5 g and 17.2 g in 100 g ash in the skipjack, respectively, and 38.0 g and 18.7 g in 100 g ash in the yellowfin, respectively. It was concluded from these results that tuna bones could be effectively utilized as a mineral source.

• Journal of Food Hygiene and Safety
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• v.35 no.5
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• pp.513-520
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• 2020

Here, we evaluated the functional properties of histidine-containing low-molecular-weight (LMW) peptides obtained from tuna waste meats. As with histidine-related components composed of histidine, 1-methyl histidine and anserine, histidine-containing LMW peptides exhibited high α,α-diphenyl-β-picrylhydrazyl (DPPH) radical scavenging effect in a dose-dependent manner. Among the histidine-related dipeptides, anserine exhibited the highest reducing power followed by carnosine. By comparison with dipeptides, tuna extracts also showed similar reducing power and the activity was in a dose-dependent manner. In addition, the antioxidant activities of tuna extracts such as DPPH radical scavenging effect, reducing power, superoxide dismutase activities, and peroxide value of linoleic acid were affected by the various extraction methods.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.15 no.4
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• pp.312-316
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• 1982

With an object to obtain an indication on the efficiency of the saury baits for tuna longline, frequencies of the saury heads found in the tuna stomachs were analysed by the equations developed from tile binomial distribution. Four factors were introduced into the equations : The hooking rate, p; rate of not being hooked q; rate of the effective baits retained in the stomachs of the captured tuna r; and the rate of tile previously taken baits retained in the tuna stomachs, t. The best estimates of $\frac{p}{p+q^t}$ and r are empirically obtained as follows. Yellowfin tuna: $\frac{p}{p+q^t}$=0.789, r=0.598 Bigeye tuna: $\frac{p}{p+q^t}$=0.810 r=0.608, Albacore tun : $\frac{p}{p+q^t}$=0.838, r=0.621.