• 한국환경보건학회지
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• 제36권5호
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• pp.435-439
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• 2010

In Korea, food-risk shock announcements are made one or more times annually; such as last September, 2010 when Seoul City revealed a very high concentration of cadmium in small octopus intestines sold in Korea. As a result, consumers avoided eating domestic as well as imported small octopus. Fishermen protested against Seoul city; however, the Korean Food and Drug Administration (KFDA) announced that small octopus intestines pose no safety risk. The conflict between KFDA and Seoul City on the safety of small octopus intestines amplified the confusion of consumers. The small octopus cadmium shock resembled previous food-risk shocks in many respects. Effective risk communication is important in resolving food risk shocks as risk affects people case-by-case; for example people who do not eat small octopus intestines should not be at any risk, but those who do enjoy small octopus intestines, especially one more times per week, could be at risk. Therefore, it is necessary to communicate different risk messages to people or groups with different eating habits. From this point of view, the risk message conveyed by the KFDA on small octopus intestines was not appropriate.

• The Korean Journal of Legal Medicine
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• 제42권4호
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• pp.168-171
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• 2018

In Korea, small octopus (Octopus minor) and webfoot octopus (Octopus ocellatus) are food items and fatal laryngeal choking due to ingestion of live octopus is not uncommon. We recently encountered two autopsy cases of accidental choking on small octopus and webfoot octopus. Case 1 involved a 58-year-old fisherman who ingested two live webfoot octopuses in his fishing boat and collapsed. He was immediately taken to the hospital but died. During autopsy, one of the webfoot octopuses was found between his pharynx and esophagus; it was obstructing the epiglottis and upper esophagus. His blood alcohol concentration was 0.140%. Case 2 involved a 55-year-old man who ingested an intact body part of a small octopus and was found dead in his house. He had a history of cerebral infarction and angina pectoris. During autopsy, an intact body part of the small octopus was found to be lodged in the laryngeal inlet.

• 수산해양기술연구
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• 제58권3호
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• pp.193-198
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• 2022

In this study, for the purpose of reducing the catch of small giant octopus in a net pot, an escape experiment of octopus was performed on five types of escape rings of different sizes. As a result of the experiment, the smallest giant octopus with a weight of 406 g was found to escape from an escape ring with a diameter of 30 mm or larger, and 592 g octopus, a weight similar to the octopus of the current minimum landing weight (600 g), escaped from an escape ring with a diameter of larger than 40 mm. An individual weight with 406 g becomes 39 mm when converted from a diameter of 25 mm circular escape vent; that is, the circumference to the inner diameter of the mesh. It can be inferred that the converted mesh size of 39 mm cannot escape. Logistic regression analysis was performed using a generalized linear model (GLM) to investigate the correlation between the ratio of escape ring size/Mantle diameter (R/MD) and the escape rate. As a result, it was found that there was a significant correlation between the R/MD ratio and the escape rate and that the higher the R/MD ratio, the greater the escape rate. As a result of logistic regression analysis, the R/MD value was denoted 0.520 with the 50% escape rate. In addition, it can be estimated to be about 50 mm when converted to the mesh size. Therefore, in this study, the diameter of the escape ring and the size of the escape possible of the octopus were experimentally considered. It was found that there was a significant correlation.

• Journal of Microbiology and Biotechnology
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• 제5권4호
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• pp.181-187
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• 1995

The cells of Vibrio vulnificus can be induced to the viable but nonculturable (VBNC) state by natural environmental parameters. The V. vulnificus cells in the VBNC state can not be recovered by ordinary laboratory techniques. This nonculturability could often hamper development of effective processing strategies to minimize the number of V. vulnificus in seafoods. Even with V. vulnificus cells in a culturable state, the length of time required to identify the bacteria in contaminated food by phenotyphic characterization may prevent appropriate in-time responses by public health agencies to infections of the bacteria. In the present study, we used polymerase chain reaction (PCR) to develop a rapid and direct detection method for V. vulnificus in small octopus (Octopus variabilis) which is consumed as a raw food in Korea. The region targeted was a 704-base pair (bp) portion of the hemolysin gene, vvhA, of V. vulnificus. The primers designed for PCR amplification were specific for all V. vulnificus sp. tested. Several methods were examined to extract total DNA directly from V. vulnificus seeded into the octopus homogenate and the guanidine isothiocyanate (CITC) method appeared to be most effective. From the octopus homogenate seeded by V. vulnificus at an initial level of $10^2$ CFU/ml of the homogenate and then incubated for 12 h, the targeted sequence was successfully amplified by PCR and the 704-bp DNA fragment was observed by gel electrophoresis. The total completion of this assay requires less than one day.

• 한국발생생물학회지:발생과생식
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• 제10권2호
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• pp.135-140
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• 2006

소형 두족류의 일종인 낙지(Octopus minor)는 근연종인 문어나 주꾸미에 비하여 산란수가 적고 갯벌 속 깊은 은신처에서 어미 낙지의 독특한 포란 행동으로 부화하기 때문에 배의 발달 과정을 관찰하기가 매우 어렵다. 본 연구에서는 인공 산란관을 설치하여 낙지의 산란과 부화를 유도하고 배 발달과정을 관찰하였다. 낙지의 배아에서는 산란 후 4일째에 배반엽이 형성되었으며 28일이 경과하면 여러 기관의 원기들이 난황낭의 중앙부에 출현하였다. 이 발생 원기는 동물극 쪽으로 이동하여 38일이 경과되면 두부에 두 눈이 생기고 몸통과 심장이 난황낭의 정단부에 출현하였다. 45일이 경과 된 뒤에는 몸통과 두부가 난막의 절반을 차지하게 자라고 길고 가느다란 팔을 움직이기 시작하였다. 산란 후 60일이 경과 한 뒤에는 여러 개의 반점을 갖는 몸통의 아래에 2개의 눈이 뚜렷하게 형성되었고 80일이 지나면 난황은 거의 흡수되고 그 자리에는 잘 발달된 8개의 팔이 가득 채우게 되었다. 발생이 끝난 새끼 낙지는 알 껍질을 찢고 팔부터 빠져 나왔으며 부화 후 곧바로 활발하게 유영하며 먹물을 분사하였다.

• 수산해양기술연구
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• 제13권2호
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• pp.27-32
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• 1977

The paper deals the fishing condition of the stern trawlers operated in the Atlantic coast of Africa. The datas are gathered from the Korean stern trawlers operated in the area from June, 1975 to May, 1976. The obtained results are summarized as follows: 1. The mean catch per haul are calculated as, cuttle fish 14.5kg, large size squid(more than :lOOg of body weight) 28.2kg, small size squid(less than 300g) 36.4kg, octopus 47.0kg. 2. Small size cuttle fish(less than5OOg of body weight) are caught much during after spring tide in July to September, yet, large size ClIttle fish(more than 500g) are caught much during neap tide in October to January. 3. Small size squid(less than 300g of body weight) are cBught much during after spring tide in October to December, yet, large size squid(more than 3OOg) are caught much during before spring tide in October to March. 4. Octopus are caught during neap tide in July to August.

• 수산해양기술연구
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• 제26권3호
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• pp.237-243
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• 1990

본 연구는 수조실험을 통하여 주꾸미, Octopus Ocellatus GRAY의 단지색에 대한 선택성을 조사하고, 전통적인 주꾸미 단지의 재질을 고둥껍질에서 PVC로 대체할 경우 그 가능성을 규명하기 위하여 PVC 시험 단지를 제작하여 1989년부터 1990년까지 해상실험을 실시하여 어획율을 조사하였다. 실험에서 얻은 결과를 요약하면 다음과 같다. 1. 수중실험에서 적색, 녹색, 황색, 백색, 회색중에서 주꾸미가 선호하는 색은 회색, 적색, 녹색, 황색, 백색순으로 나타났다. 2. 해상실험에서 주꾸미의 선호색은 회색, 홍색, 녹색순으로 나타났고, 이것은 수조실험의 결과와 일치한다. 3. 어획성능면에서 고둥껍질과 회색 PVC 단지의 차이는 거의 없었다. 4. 직경별 어획율은 40mm PVC 단지가 1.00, 50mm가 0.19로 나타났다.

• 한국수산과학회지
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• 제56권5호
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• pp.728-733
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• 2023

The diet composition of octopus Octopus vulgaris was studied using 392 specimens collected from January to December 2020 in the coastal waters of Yeosu, Korea. The body weight ranged from 86.4 to 3,645.4 g. The most important prey item in the diet of O. vulgaris was decapods, which constituted 43.9% in ranking index (%RI). The second largest prey item was Pisces (%RI=27.9%), and cephalopods (%RI=21.8%) constituted the third largest prey item. The average trophic level of O. vulgaris was 3.97±0.59. Ontogenetic changes were significant among size classes (<400 g, 400-800 g, ≥800 g). The small size class (<400 g) mainly fed on decapods, whereas the medium (400-800 g) and large size (≥800 g) classes mainly fed on cephalopods and Pisces, respectively. The dietary composition varied significantly with season.

• 수산해양기술연구
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• 제41권4호
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• pp.248-262
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• 2005

The purpose of this study was to identify the state of demersal fish resource catch by small trawlers, which live in the southern waters off Goheung. We investigated the results of catch of sample fishing vessels, and performed fishing experiments using the actual fishing operation vessels from early November in 2002 till end of October in 2003. The daily amount of catch per vessel of the 35 small trawlers selected as sample vessels was the highest in summer seasons(June and July) as 70kg and the lowest in winter seasons(January and February) as 45kg and Octopus minor occupied as 17 to 30kg nearly 30% of the total catch. Additionally the catch of Octopus minor per vessel, per dragging hour ranges 3 to 6kg, which is the highest in March and June and the low in January to February, April to May and September. In the fishing experiments using small trawler, during the study period, a total of 75 fish species were collected. The number of individuals by species consisted 58.2% in Shrimps, 17.8% in Fish, 2.3% in Cephalopod. Of these, Parapenaeopsis tenella was the highest in 29.2%, Squilla oratoria and Crangon hakodatel was 14.6% respectively and Octopus minor was 0.2% of the total number of individuals. As far as the appearance number of individuals by month was concerned, February was the highest and then May, April and June followed in order, and October showed the lowest. Additionally the monthly catch per dragging was the lowest in December to January as 20kg and the highest in July as 160kg. Specially, Octopus minor was caught throughout the year regardless of season and the catch was the highest at the period from March to June. When looking into the body mean length of dominant fishes caught, we could observe the followings; Trachurus japonicus 8.9cm, Cynoglossus robustus 10.8cm, Muraenesox cinereus 15.3cm, Setipinna taty 10.3cm, Amblchaeturichfhys hexanema 9.3 cm and Collichthys niveatus 8.9cm, most of which were in their immaturity when they were caught.

• 수산해양기술연구
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• 제41권4호
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• pp.271-278
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• 2005

In order to study the catch situation of the octopus pot fishery in the coastal waters of Gangneung, catch quantities and weight per month and depth, the soaking time & loss of fishing gear were studied based on 62 fishing times (1 set consisted of 150 pots which is equivalent to 1 fishing time) over a period of 10 months from February to December 2003 using commercial fishing vessels and training ships. The monthly CPUE was generally high in the months of june - September, and during this period July showed the highest quantity (134g/pot, 19.21kg/haul). In consideration of the fact that octopus below the weight of 2kg is protected in foreign countries, the majority of the catch was small with 76% (486 octopuses) below 1kg. The octopus catch quantity was high in depth of more than 40m, and the average catch number per set of pots in depths of over 50m was the highest with 13 octopuses. CPUE(g/pot) was the highest at a depth of over 60m recording 101. In terms of catch quantity per soaking time (4-18 days) the highest was on the 7th day, and 13-18 days also recorded high catches, and this suggests the possibility of ghost - fishing with the loss of fishing gear. Loss of fishing gear was the highest in terms of loss frequency and amount at depths of 20-30m. Consequently, it seems that octopus pot fishing at depths of more than 30m would relieve friction with other types of fishing and increase fishing efficiency.