• 수산해양기술연구
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• 제54권4호
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• pp.353-359
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• 2018

Basic reproductive biology of the daggertooth pike conger, Muraenesox cinereus were investigated based on the samples from August 2015 to December 2017 in Korean waters. A total of 2,328 samples was collected (1,593 females and 735 males) during the study period. The mean anal lengths (AL) were $33.5{\pm}9.2cm$ in females and $26.2{\pm}7.3cm$ in males respectively. The females were larger than males in AL (p < 0.05). Sex ratio was 2.2:1 in female to male (p < 0.05). The gonadosomatic index (GSI) varied monthly. GSI of female reached the maximum in July 2016 and June 2017 and the minimum in October 2016 and September 2017 respectively. The spawning period was from June to October. The size at sexual maturity ($L_{50}$) of females was estimated at 24.9 cm in AL (63.5 cm in TL).

• 수산경영론집
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• 제53권1호
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• pp.55-72
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• 2022

The domestic catch of squid is decreasing every year. Import volume is increasing to replace these domestic products. Import volume is expected to increase in the future, so it is necessary to study import substitution. Therefore, in this study, after selecting frozen squid, which accounts for the majority of imported squid, as the target fish species, China, Chile and Peru, which account for the majority of frozen squid imports, will be selected as the target countries for analysis. Then, the demand function of squid is estimated using the Rotterdam model, the inverse Rotterdam model, AIDS and inverse AIDS, which are the simultaneous equation demand types, and then elasticity is derived. After that, these models are compared in terms of significance, theoretical fit and practical fit.

• 한국수산과학회지
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• 제55권2호
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• pp.189-194
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• 2022

Unidentified postflexion larva (18.57 mm in standard length, SL), belonging to the family Synodontidae was collected from Jeju Island, Korea, in November 2019. Molecular analysis revealed that the unidentified larva was identical to Synodus kaianus adults in mtDNA cytochrome c oxidase subunit I region (Kimura-2-parameter distance, d= 0.006), and was different from the close species S. macrops (d=0.220). The postflexion larva of S. kaianus has the following morphological features: regularly distributed seven peritoneal pigment spots along the alimentary canal; and, intensively distributed stellate melanophores at the middle of the base of caudal fin and behind the last anal fin ray. The postflexion larva of S. kaianus differed from that of S. macrops in snout length and size of peritoneal pigment spots. This is the first record of S. kaianus in Korea, and we suggest the Korean name "Ka-i-ya-kkoch-dong-myeol" for S. kaianus, according to Lee et al. (1999).

• 한국수산과학회지
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• 제55권1호
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• pp.67-72
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• 2022

We investigated the changes in the egg diameter of chub mackerel Scomber japonicus with the stages of egg development (and distinguished between hydrated oocyte and non-hydrated oocyte) for 1, 2, 3, 5, 10, 15 and 30 days. The chub mackerel oocytes were preserved in seven fixing solutions (70% ethyl alcohol, 99.9% ethyl alcohol, 5% formalin, 10% formalin, 5% neutral buffered formalin, 10% neutral buffered formalin and Gilson's solution). At 30 days, the chub mackerel hydrated oocytes preserved in 70% ethyl alcohol and 99.9% ethyl alcohol had shrunk by 5.2% and 7.9%, respectively. Similarly, the non-hydrated oocytes in the same solutions shrunk by 10.3% and 14.0%, respectively. Oocytes preserved in Gilson's solution had an average egg diameter decrease in both the hydrated oocyte (by 16.9%) and non-hydrated oocytes (by 15.6%). The diameter of the preserved hydrated oocytes did not significantly differ between the 5% formalin, 10% formalin, 5% neutral buffered formalin and 10% neutral buffered formalin, with shrinkage percentages of 0.6%, 0.1%, 1.9% and 3.4%, respectively (P>0.05). Similarly, the shrinkage percentages of the non-hydrated oocytes were 4.3% (5% formalin), 5.5% (10% formalin), 4.3% (5% neutral buffered formalin), and 4.1% (10% neutral buffered formalin).

• 한국수산과학회지
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• 제56권1호
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• pp.1-6
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• 2023

Since 2019, Korea Ministry of Oceans and Fisheries has set the annual total allowable catch (TAC) by fish species, and has allocated the annual TAC into each fishery vessel. Also the Korea government plans to adopt the individual transferrable quota system in time. The TAC allocation is similar to the individual fishermen/fishing quota, which the US National Oceanic and Atmospheric Administration has implemented. However, the TAC based management faced fishermen's complaints and a debate is still underway about how to allocate TAC. Because the ideas of the Korea policy are from those in the foreign countries, I intended to provide the Korea fisheries community with an overview about how the TAC has been developed, what problem it caused, and foreign examples of how to allocate it. Furthermore, I pointed out a substantial room for improvement in their current practice of stock assessments, because, otherwise, their current methods for estimation of TAC by species cannot be trusted. Finally I made specific suggestions about what they need to do to reform their current stock assessments.

• 한국수산과학회지
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• 제56권4호
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• pp.449-461
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• 2023

The aim of this study was to conduct an ecosystem-based fishery risk assessment of tuna fisheries in the Western Indian Ocean. We selected gillnet, purse seine, hand line, baitboat, and longline fisheries as the target fisheries method, and selected longtail tuna (Thunnus tonggol), narrow-barred Spanish mackerel (Scomberomorus commerson), kawakawa (Euthynnus affinis), skipjack tuna (Katsuwonus pelamis), yellowfin tuna (T. albacares), bigeye tuna (T. obesus), albacore tuna (T. alalunga) and swordfish (Xiphias gladius) as the target species. The risk score for the size at the first capture in sustainability objective was high, especially, for the purse seine and baitboat fisheries using the fish aggregating devices (FADs). The risk score for the bycatch in the biodiversity objective was high for the gillnet fishery, and the gillnet fisheries using FADs showed high risks for the habitat quality objective due to the loss of the fishing gears. With regards to the socio-economic benefits objective, the risk score of the sales profits was low due to high sales of the tuna fisheries. The ecosystem risk score in the Western Indian Ocean was estimated to be moderate, although management is required for some of the indicators that have high-risk scores.

• 수산경영론집
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• 제54권1호
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• pp.051-069
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• 2023

This study analyzed the determinants that affect the purchase of ready-to-cook seafood products using the "Consumer Attitude Survey on Processed Foods" from 2018 to 2021. Dietary lifestyle, food awareness and preference survey questions were categorized, and factors affecting the purchase probability of ready-to-cook seafood were identified through a binomial logit model. The main research findings are as follows. First, consumers had higher preference for quality, safety, and new taste factors than health and price factors when purchasing HMR (Home Meal Replacement). Second, through binomial logit model analysis, the probability of purchasing ready-to-cook seafood products was low in the group pursuing taste and economy. On the other hand, the purchase probability was high in the group seeking convenience. Third, the purchase probability of ready-to-cook seafood products was higher in households with two or more persons than in single-person households. These results suggest that differentiated product development and marketing strategies should be needed for each consumer groups in the seafood convenience food market.

• 한국수산과학회지
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• 제56권6호
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• pp.909-915
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• 2023

A specimen of longarm mullet Moolgarda cunnesius (Valenciennes, 1836) belonging to the family Mugilidae was collected from Yerae-dong, Seogwipo-si, Jeju-do Island, Korea, on July 19, 2023, using a hand net. The specimen was identified as Moolgarda cunnesius based on its morphological traits, including pectoral fin reaching the third or fourth spine of the first dorsal fin, anal fin higher than the first and second dorsal fin, two dorsal and caudal fin membranes with small melanophores, and a slightly convex interorbital region. Furthermore, molecular analysis, specifically comparison of the 623 base pairs of mitochondrial DNA COI sequences, confirmed that our specimen perfectly matched M. cunnesius. It is well known that the species is widely distributed in the Indo-West Pacific Ocean, including the Red Sea, Taiwan, and northern Australia, and this study shows that it also inhabits the Jeju-do Island, Korea. Additionally, we propose a new Korean name 'gin-pal-sung-eo' for this species.

• 한국항해항만학회지
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• 제38권6호
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• pp.663-672
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• 2014

우리나라와 필리핀을 비롯하여 전 세계적으로 해양생태자원의 중요성을 인식하고 이를 보호하고 보전하기 위하여 해양보호구역을 설정하여 관리하고 있다. 그러나 해양생태자원 보호를 위한 해양보호구역의 수는 늘어난 반면, 대부분의 해양보호구역들이 원래의 설정목적에 맞게 효율적으로 관리되지 못하는 문제점을 안고 있다. 이는 직접적인 이해당사자인 지역주민이나 수산업자들은 해양보호구역의 설정으로 발생하는 긍정적이고 부정적인 영향으로 인하여 해양보호구역의 설정에 찬성과 반대에 대한 논쟁이 지속되고 있기 때문이다. 따라서 본 연구에서는 오래전부터 수산자원의 관리와 보존 및 보호를 위해 제정된 1998년 필리핀 수산업법에 의하여 지방정부 하여금 관할해역의 15% 이상을 수산자원보호구역으로 지정하여 관리해 오고 있는 필리핀 기마라스주 해양보호구역 설정에 대한 사례연구를 실시하였다. 이를 위해서 연구 지역인 기마라스주 두 시의 지역주민들을 대상으로 수산자원을 위한 해양서식지의 보호와 보존을 위해 필요한 해양보호구역 설정논쟁에 대한 인식조사와 지불의사금액(WTP)을 추정하기 위하여 이분선택형 조건부가치측정 설문조사를 실시하였다. 새로이 설정될 해양보호구역 내에서의 어로행위 제한으로 예상되는 경제적 손실 때문에, 과반수 이상인 응답자의 58.7%는 손실에 대한 보상이 이루어져야 한다고 응답하였지만, 수산자원의 보호를 위한 관리방안으로 해양보호구역의 증대필요성에 대해서는 91.4%가 찬성하는 것으로 나타났다. 마지막으로 조건부가치측정법(CVM)을 통하여 기마라스주 산로렌조시와 시부낙시 전체 지역주민들이 부여하는 해양보호구역(375.5ha)에 대한 평균가치는 $1,046,791달러로 추정되었다. 따라서 이러한 연구결과는 우리나라 해양보호구역의 효율적인 관리방안 수립에 유용한 자료로 활용될 수 있을 것이다.

• 한국수산과학회지
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• 제34권4호
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• pp.355-358
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• 2001

본 논문은 한국 근해 다종어업 자원의 평가모델에 대한 연구결과로서 대형기선저인망쌍끌이어업과 같은 단일어업에 의하여 다종자원을 이용하는 형태이다. 단일어구에 의한 다종자원의 평가모델은 단일어구에 어획되는 다종자원 중 어획량비율이 상위를 차지하는 어종을 선별한 후 각 어종에 대한 혼획율 및 자원생태학적 특성치를 추정하여 Beverton and Holt (1957)의 가입당생산량 모델을 변형시킨 다종가입당 생산량모델을 이용하는 것이다. 이 모델은 현재의 $t_c$에서 다종에 대한$F_{0.1}$에 해 당하는 F값을 구하여 각 어종별 가입당산란자원량 모델에 적용하였으며, 이때의 산란자원량 수준인 $F_{x\%}$를 추정하여 자원평가에 이용하였다.