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강원도 연안의 도루묵(Arctoscopus japonicus) 자치어 분포와 회유
양재형 ( Jae Hyeong Yang ),윤상철 ( Sang Chul Yoon ),박정호 ( Jeong Ho Park ),최영민 ( Young Min Choi ),이재봉 ( Jae Bong Lee ),윤병선 ( Byoung Sun Yoon ) 한국수산과학회 2013 한국수산과학회지 Vol.46 No.5
Distribution and migration of larval and juvenile sandfish Arctoscopus japonicus in the coastal waters off Gangwondo were determined monthly from samples collected by a rectangular bottom net in the coastal waters off Gangwondo from March to July, 2011. Fish were collected in abundance from the northern waters from March to June. The average total length (±SD) was 11.5±1.6 mm in March increased up to 53.5±3.3 mm in June. The size distribution of sandfish by depth suggested that the fish grew waters less than 50 m deep until June, before moving deeper waters of around 100 m.
동해 포항 연안 문치가자미(Pseudopleuronectes yokohamae)의 연령과 성장
양재형 ( Jae Hyeong Yang ),이해원 ( Hae Won Lee ),이재봉 ( Jae Bong Lee ),차형기 ( Hyung Kee Cha ),김성태 ( Sung Tae Kim ),윤병선 ( Byoung Sun Yoon ) 한국수산과학회 2017 한국수산과학회지 Vol.50 No.3
The age and growth of marbled flounder Pseudopleuronectes yokohamae in coastal waters of the East Sea of Korea off Pohang were determined, by evaluating monthly samples of commercial catches, caught by gill nets and longlines from February 2013 to January 2014. New annuli from annually in P. yokohamae otoliths, and the boundary between the opaque and translucent zones forms from March to May. The relationships between total length (TL) and total weight (TW) were TW=0.009TL<sup>3.128</sup> (R<sup>2</sup>=0.969) for females and TW=0.008TL<sup>3.150</sup> (R<sup>2</sup>=0.964) for males. The TLs at the time of annulus formation, back-calculated from the otolith-length relationship by reference to the von Ber-talanffy growth curves, were L<sub>t</sub>=52.63 (1 - exp<sup>(-0.231(t+0.033))</sup>) for females and Lt=36.22 (1 - exp<sup>(-0.400(t+0.117))</sup>) for males. Commencing at the age of 3 years, females grew faster than males (P<0.05).
강원도 묵호 연안에서 출현하는 대구횟대(Gymnocanthus herzensteini)의 식성
양재형 ( Jae Hyeong Yang ),윤상철 ( Sang Chul Yoon ),박정호 ( Jeong Ho Park ),윤병선 ( Byoung Sun Yoon ),최영민 ( Young Mm Choi ),이재봉 ( Jae Bong Lee ) 한국수산과학회 2013 한국수산과학회지 Vol.46 No.2
The feeding habits of the black-edged sculpin Gymnocanthus herzensteini were studied using 944 specimens collected from February 2011 to January 2012 in the coastal waters off Mukho, Gangwondo. Korea. The G. herzensteini ranged from 11.8 to 36.3 cm in total length (TL). The percentage of empty stomachs in G. herzcnsteini was 40.2%, and the main prey items were Pisces, Euphausiasea, and Macrura. The smallest size group (11.8-15.0 cm TL) consumed mainly Polychaea and Amphipoda. The quantity of prey increased in proportion to sculpin size. The composition of prey items and feeding habits of G. herzensteini exhibited seasonal fluctuations, that is. the main prey items during spring were Euphausiasea, whereas those during other seasons were Pisces.
동해안 도루묵, Arctoscopus japonicus의 회유와 분포변동 특성
양재형 ( Jae Hyeong Yang ),이성일 ( Sung Il Lee ),박기영 ( Kie Young Park ),윤상철 ( Sang Chul Yoon ),김종빈 ( Jong Bin Kim ),전영열 ( Young Yull Chun ),김상우 ( Sang Woo Kim ),이재봉 ( Jae Bong Lee ) 한국어업기술학회 2012 수산해양기술연구 Vol.48 No.4
Distribution pattern and fishing conditions of sandfish, Arctoscopus japonicus in the East Sae were explored using catch and catch per unit effort (CPUE) by eastern sea Danish seine and coastal gill net fisheries from 2004 to 2008. A. japonicus was one of major target species for the eastern sea Danish seine and coastal gill net fisheries in the East Sea, which were caught from April to October for the eastern Danish seine, and from October to December for the coastal gill net, respectively. In recent, the distribution and centroid of fishing ground moved northward, as seawater temperature increased. The species spawned in the coastal areas of Gangwon, northern East Sea, during winter, started to move to deeper water after spawning from spring, extended widely from Gangwon to Ulsan, southern East Sea, during summer, and migrated back to the spawning ground off Gangwon during autumn.
울릉도 연안에 서식하는 불볼락(Sebastes thompsoni) 성숙과 산란
양재형 ( Jae Hyeong Yang ),이재봉 ( Jae Bong Lee ),이해원 ( Hae Won Lee ),차형기 ( Hyung Kee Cha ),김소라 ( So Ra Kim ),허요원 ( Yo Won Heo ) 한국수산과학회(구 한국수산학회) 2016 한국수산과학회지 Vol.49 No.3
We investigated the maturation and spawning of Sebastes thompsoni in the coastal waters off Ulleungdo, based on samples collected by gill net from March 2013 to February 2014. We analyzed monthly changes in maturity stage, gonadosomatic index (GSI), egg diameter, fecundity, and total length (TL) at 50% group maturity. The average TLs of female and male S. thompsoni were 22.6 cm and 22.5 cm, respectively. The main parturition period of females was during March and April. The GSI of females began to increase in January, and reached a maximum in March. The GSI of male reached a maximum between January and February. The spawning period of males was shorter than that of females. The egg diameter during gestation stage was 1.4±2.1 mm. The TL of females at 50% group maturity was 22.3 cm.
연구노트 : 한국 영일만에서 수산자원 종조성과 계절변동
이재봉 ( Jae Bong Lee ),신영재 ( Young Jae Shin ),이수정 ( Soo Jeong Lee ),이종희 ( Jong Hee Lee ),최영민 ( Young Min Choi ),이동우 ( Dong Woo Lee ),김상우 ( Sang Woo Kim ),양재형 ( Jae Hyeong Yang ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.10
Coastal marine ecosystem plays important role of spawning and nursery grounds for fisheries resources. Yongil Bay is one of major coastal marine ecosystems, which is located in the southwestern East Sea of Korea. Species composition and abundance of marine organism in the Yongil Bay were investigated by season from March to November 2009. Gill net and pot fisheries were used for survey of pelagic and demersal species composition, and collected 106 species, 67 families, and 7 taxa of fisheries resources from the coastal ecosystem. Species were included 2 species in Ascidiacea, 2 species in Bivalvia, 6 in Cephalopoda, 22 in Crustacea, 5 in Echinodermata, 12 in Gastropoda, and 57 in Pisces. Diversity indices (Shannon index, H`) showed seasonal variation with low value of 2.11 in winter, and high value of 2.63 in autumn. Main dominant species were Asterias amurensis, Pleuronectes yokohamae, Siphonalia spadicea fuscolineata, Trachurus japonicas, Sillago japonica, Conger myriaster, Volutharpa ampullaceal, Engraulis japonicus, Asterina pectinifera, and Portunus (Portunus) sanguinolentus that were occupied over 71.5% of total individuals, and 52.9% of wet weight. Seasonal variations of fisheries resources composition were discussed on correlationships with those of environmental factors in the coastal ecosystem of the Yongil Bay in Korea. Those results from this study will provide scientific data and information to develop the ecosystem-based coastal fisheries assessment and management system in Korea.
강원도 고성연안에서 정치망으로 채집된 어류 종조성과 군집구조
이수정 ( Soo Jeong Lee ),양재형 ( Jae-hyeong Yang ),서영일 ( Young Il Seo ),김진구 ( Jin-koo Kim ) 한국어류학회 2021 韓國魚類學會誌 Vol.33 No.2
본 연구에서는 남한측 동해 최북단인 강원도 고성군에서 2년간 (2018~2019년) 매월 정치망을 이용하여 어류 종조성을 확인하였으며, 과거 연구와의 비교를 통해 동해 해양환경과 어류상 간의 관계를 확인하고자 하였다. 조사기간 동안 총 77개 분류군이 어획되었으며, 이 중에서 75개 분류군이 종 수준까지 확인되었다. 우점하는 분류군은 참복과, 가자미과 등이었으며, 우점종은 도루묵, 전어, 쥐치, 말쥐치, 전갱이 등이었다. 표층수온은 과거에 비해 겨울철 및 봄철에는 지속적으로 상승하였고, 봄철 어류 종조성은 과거 한류성 어종에서 최근 난류성 어종으로 변화한 것으로 확인되었다. 본 연구에서는 이전 연구보다 참복과 어류의 종 다양성이 매우 높았는데, 이는 수온 상승과 함께 동해안으로 유입되는 참복과 어류의 양적인 증가와 관계가 있는 것으로 추정된다. 어류 종조성에서는 과거 남부해역 (삼척, 강릉)의 종조성과 유사해졌으며, 월별 군집분석 결과에서는 한류성 어종이 우점하는 1~4월 그룹과 방어, 고등어가 우점하는 7~10월 그룹, 그리고 난류성 어종이 우점하는 5~6월, 11~12월 그룹으로 나뉘어져서 1년 중 8개월이 동해안으로 회유하는 난류성 어종들이 우점하는 것을 확인할 수 있었다. 장기간 난류성 어종들의 우점하는 경향은 북방한계선의 확장, 서식적수온대의 장기간 형성, 그리고 풍부한 먹이에 따른 결과로 생각된다. 따라서, 동해안으로 회유하는 난류성 어종들의 상업적인 이용방법 모색과 동시에 효율적인 자원관리 정책의 마련이 필요할 것으로 생각된다. In order to understand the seasonal variations of species composition of fish in the Goseong, middle East Sea of Korea, we surveyed fish fauna using set net during 2 years. In this study, a total of 77 taxa belonging to 40 families were collected and 75 species were identified. The dominant family were Tetraodontidae and Pleuronectidae, and the dominant species were Arctoscopus japonicus, Konosirus punctatus, Stephanolepis cirrhifer, Thamnaconus modestus, and Trachurus japonicus. The results of the hierarchical clustering using the number of individuals of collected species showed that they are divided into three seasonal groups: Group A (Jan.~Apr.), Group B (May~Jun., Nov.~Dec.), Group C (Jul.~Oct.). The sea surface temperature (SST) was higher than the results of previous studies in winter and spring, and species composition in spring have changed from cold-water species to the warm-water species, recently. The species composition has become similar to the that of southern Gangwon-do regions (Samcheok and Gangneung) of the previous studies. The species diversity of family Tetraodontidae has increased, which is estimated to have an effect on increase in SST and the quantity of entering the East Sea. Therefore, we assumed that the change of species composition is related to the extension of northern distribution limits and survival temperature, and abundant preys. Therefore, it is necessary that an efficient resource management policy as well as the ways of commercially use of migratory warm-water fish, rapidly.
동해에 서식하는 대게류(Chionoecetes spp.)의 재생산 및 분포 특성
차형기 ( Hyung Kee Cha ),양재형 ( Jae Hyeong Yang ),이성일 ( Sung Il Lee ),윤상철 ( Sang Chul Yoon ) 한국수산과학회 2014 한국수산과학회지 Vol.47 No.5
Two Chionoecetes crabs, C. opilio and C. japonicus are primary targets of trap fisheries in the East Sea. To promote the sustainable management of these species, we investigated their reproductive biology and spatial distribution based on samples collected in standardized traps in the coastal waters of eastern Korea from September 2007 to August 2008. The estimated spawning season of C. opilio was March- April, whereas that of C. japonicus continued year-round. The estimated molting period of both species was September- October. Fecundity of C. opilio was pro-portional to female, size, ranging from 44,791 to 151,538 eggs, and the estimated body size at 50% sexual maturity was 63.9 mm carapace width. Egg bearing female C. opilio were mostly collected depths of 200-300 m, particularly off Hupo and Chuksan, suggesting that these areas are their major spawning grounds. In contrast, female C. japonicus were mostly collected at depths of 400-600 m, peaking at 600 m. The species-specific catch rate was higher for C. opilio above 400 m, similar at ca. 450 m, and higher for C. japonicus below 500 m. These vertical differences indi-cate apparent spatial segregation of the species, suggesting that spatially-explicit fisheries management plans may be necessary for mitigating conflicts between the respective crab fisheries and maintaining these crabs.
한국 동해안 기름가자미(Glyptocephalus stelleri)의자원평가 및 적정어획량 추정
손명호 ( Myoung Ho Sohn ),양재형 ( Jae Hyeong Yang ),박정호 ( Jeong Ho Park ),이해원 ( Hae Won Lee ),최영민 ( Young Min Choi ),이재봉 ( Jae Bong Lee ) 한국수산과학회 2013 한국수산과학회지 Vol.46 No.5
The blackfin flounder Glyptocephalus stelleri is a commercially important species in the East Sea of Korea, but its catches and biomass have decreased gradually in recent years. This study estimated the optimal catch (acceptable biological catch, ABC) for the effective management of this species by estimating population ecology parameters and the stock biomass of blackfin flounder in the East Sea of Korea. The estimated instantaneous coefficient of total mortality (Z) of blackfin flounder was 1.0542/year, the survival rate (S) was 0.3485, and the instantaneous coefficient of natural mortality (M) was 0.3637/year. From the values of S and M, the instantaneous coefficient of fishing mortality (F) was calculated to be 0.6905/year. The age at first capture was 1.304 years, and the total length was 11.5 cm at that time. On the basis of these parameters, the annual biomass was estimated by a biomass-based cohort analysis using annual catch data in weight by year for 1991-2012 in the East Sea of Korea. The annual biomass peaked in 1997 at about 12,800 mt and then subsequently declined continuously to a level of 10,500 mt in 2004 and to 9,800 mt in 2011and 2012. The maximum sustainable yield and F0.1 were estimated as 3,547 mt and 0.3595/year, respectively. Using these estimations, the ABC was estimated to be 3,571 mt in tier 5, 3,397 mt in tier 4, and 2,622 mt in tier 3.