• 한국수산과학회지
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• 제56권6호
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• pp.916-922
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• 2023

An abnormal shape of Bathyraja brachyurops was first reported from the catch of a bottom trawl in the southwest Atlantic Ocean in June 2022. Both pectoral fins of the specimen did not fuse with the head, resulting in a horn-like structure separated from the sides of the eyes. Analysis of mitochondrial DNA cytochrome c oxidase subunit I sequences showed that our specimen was perfectly matched to Bathyraja brachyurops registered with the National Center for Biotechnology Information. Our specimen possessed the following morphological features: a pair of flexible but elongated and pointed horns on the head; rough dorsal disc, densely covered with numerous small denticles on the head, anterior margin of pectoral fins and median line of the disc; a thorn between the first and second dorsal fins; and a pair of large ocelli at the base of pectoral fins. Unlike the normal B. brachyurops, our specimen had a slender clasper and no nuchal thorns, which may be related to the morphological abnormality. The horn-like structure on the head may be owing to the lack of fusion between the pectoral fins and head during early embryonic development.

• 한국어류학회지
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• 제35권1호
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• pp.1-9
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• 2023

이 연구는 탁자볼락의 자치어 형태발달을 관찰하여 분류 및 종자생산 연구의 기초자료로 이용하고자 실시하였다. 연구에 사용된 어미는 2016년 3월 강원도 고성군 주변 해역에서 포획한 것을 이용하였다. 자어 산출을 위한 사육수온은 11~12℃(평균 11.5±0.5℃)였다. 산출 직후 자어는 전장 5.25~5.96 mm (평균 5.60±0.19 mm)로 난황을 가졌고 입과 항문은 열려 있었다. 산출 후 35일째 후기자어는 전장 7.16~11.4 mm (평균 9.02±1.00 mm, n=30)로 척추말단 끝부분이 완전히 휘어졌다. 산출 후 48일째 치어는 전장 9.45~18.7 mm (평균 14.4±1.75 mm, n=30)로 이 시기에는 등지느러미 XIII, 13~15개였고, 뒷지느러미 III, 6~8개, 꼬리지느러미 기조 수는 16개였다.

• 한국수산과학회지
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• 제54권3호
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• pp.329-339
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• 2021

The monthly variation in species composition of fishes in the Gujora and Mangchi coastal waters in Geoje, Korea, was investigated between June 2018 and May 2019 through monthly fish collections using a gill net. A total of 46 species, numbering 410 individuals weighing a total of 96,645.0 g, were collected during the study period. The dominant species in terms of numbers were Chelidonichthys spinosus, Stephanolepis cirrhifer, Ditrema temmincki, Sillago japonica, Sebastes inermis, and Paraplagusia japonica. The number and biomass of fishes peaked in July. The peak in species diversity indices occurred in September. The cluster analysis revealed that there were four groups of fishes depending on the season. In addition, subtropical fishes were recorded in the study area, indicating the gradual subtropicalization of the coast of Geoje. Furthermore, the need to understand the changes in marine ecosystems owing to subtropicalization through continuous monitoring is emphasized.

• 한국수산과학회지
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• 제53권6호
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• pp.934-941
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• 2020

The spatial and temporal catch variations of Argentine shortfin squid Illex argentinus in the Southwest Atlantic Ocean (SWA) were analyzed using Korean squid-jigging fishery data collected through electronic reporting system (ERS) from 2016 to 2020. The ERS linked with GPS has been implemented for collecting fishing data from all Korean fishing vessels operating in international waters since November 2015. The fishing period of the Korean squid-jigging fishery in the SWA runs from early summer to autumn (December to June) in the Southern Hemisphere. The fishing ground was extended from 42°S to 48°S along the Patagonian continental shelf and slope, and the main fishing ground was formed around the Falkland Islands. The yearly catch per unit effort (CPUE) of I. argentinus fluctuated between 1.69 and 7.53 tons/day. In this study, during the fishing season, a south and westward shift on the fishing ground was observed indicating the feeding migration of the south Patagonian stock. The shift in monthly fishing centroids differed according to fishing season. The gradual southward shifts of fishing centroids were observed in the catch years (2017 and 2018), whereas unapparent shifts in fishing centroids were observed in the low catch years (2016 and 2019).

• 수산해양기술연구
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• 제58권1호
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• pp.49-58
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• 2022

In September and October 2020, combined acoustic and trawl surveys were conducted in the northwestern sea of Jeju Island. In the survey area, a region, so called Jeju region, was designated to esimate the biomass of chub mackerel and jack mackerel using a trawl survey method and frequency difference method. In the September survey, the weight ratios of jack mackerel and chub mackerel to the total catch were 24.6% and 2.8%, respectively, and in the October survey, those ratios were 24.9% and 20.7%, which were used to calculate their biomass (trawl survey). Using the frequency difference range (-8 to -3dB) corresponding to two species in 120 and 200 kHz, their biomass was estimated (frequency difference method). As a result, the biomass of two species from the trawl method was 3252.3 tons in September and 5777.0 tons in October. The estimated biomass by the frequency difference method was 4926.6 tons in September and 7521.5 tons in October. It was the first trial to estimate the biomass of two species using the trawl and frequency differencing methods in South Korea although there were some differences between two methods. In addition, horizontal distributions of acoustic backscattering strength over the entire survey area were mapped.

• 한국해양생명과학회지
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• 제5권1호
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• pp.9-16
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• 2020

Irgarol과 diuron에 각각 노출된 해산규조류(Skeletonema costatum)의 개체군 성장률(r)을 분석하여 독성평가를 실시하였다. S. costatum을 irgarol (0, 0.31, 0.63, 1.25, 2.5, 5 ㎍ l^-1)과 diuron (0,7.81, 15.63, 31.25, 62.5, 125 ㎍ l^-1)에 각각 96시간 노출하여 r을 계산하였고, 대조구의 r은 0.04 이상으로 시험기준에 적합하였다. S. costatum의 r은 irgarol에서 0.63 ㎍ l^-1, diuron은 15.63 ㎍ l^-1 이상에서 대조구 대비 유의하게 감소하기 시작하여 irgarol과 diuron의 농도가 증가할수록 r이 감소하는 농도의존적인 반응을 나타냈고, 시험 최고농도 5와 125 ㎍ l^-1에서 r이 대조구 대비 80% 이상 감소하였다. Irgarol과 diuron에 노출시킨 S. costatum r의 반수영향농도(EC₅₀)는 1.09, 45.45 ㎍ l^-1, 무영향농도(NOEC)는 0.31, 7.81 ㎍ l^-1, 최소영향농도(LOEC)는 0.63, 15.63 ㎍ l^-1으로 나타났으며, EC₅₀ 기준으로 irgarol이 diuron보다 독성이 큰 것으로 나타났다. 본 연구결과로 해양생태계에서 Irgarol과 diuron의 농도가 0.63과 15.63 ㎍ l^-1 이상이 되면, 해산 규조류 S. costatum의 r은 독성영향을 받을 것으로 판단된다. 또한, 독성 값으로 제시된 결과들은 irgarol과 diuron의 기준농도 설정을 위한 기초자료로 유용하게 활용될 것이다.

• 한국수산과학회지
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• 제57권2호
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• pp.153-168
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• 2024

Morphological and skeletal development in the cultured threeline grunt Parapristipoma trilineatum was studied from 1.96 to 61.39 mm notochord length (NL) or standard length (SL) specimens (n=360). After two days post-hatching (dph, 2.13 mm NL), the mouth opened, and melanophores formed in the eyes and egg yolk were absorbed. Oli globules were absorbed at 3 dph (2.71 mm NL). The total number of fin rays reached that of adults at 28 dph (10.58 mm SL). During skeletal development, the premaxillaray, dentary, opercle, preopercle, and cleithrum first began to ossify at 6 dph (3.51 mm NL). Ossification of all skeletal elements was completed at 28 dph (14.57 mm SL). The vertebrae began to ossify at 17 dph (5.63 mm SL) and were completed at 28 dph (8.48 mm SL), progressing from cranium to caudal bone. The centrum ossified from the dorsal to ventral direction. Vertebral fusion and separation were found to be common skeletal abnormalities.

• 한국양식학회:학술대회논문집
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• 한국양식학회 2006년도 수산관련학회 공동학술대회 발표요지집
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• pp.243-244
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• 2006

• 어선
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• 제19권
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• pp.74-80
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• 1984

• 수산경영론집
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• 제13권2호
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• pp.1-30
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• 1982