• 제목/요약/키워드: fisheries Management

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울릉도 및 독도 근해의 불볼락(Sebastes thompsoni)의 연령과 성장 (Age and Growth of the Goldeyes Rockfish Sebasetes thompsoni in the Ulleungdo and Dokdo Areas)

  • 허요원;이재봉;양재형;차형기;김중진;장창익
    • 한국수산과학회지
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    • 제48권6호
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    • pp.929-939
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    • 2015
  • We studied the characteristics of age and growth of the Goldeyes rockfish Sebasetes thompsoni in the Ulleungdo and Dokdo areas by using 730 otoliths from February 2013 to February 2014. The lowest value of the marginal index was found in June once a year. The spawning period was estimated as April. Therefore, the duration from fertilization to the complete formation of the first annual growth ring is fourteen months. From the parameters calculated using the weighted average length of the year ring formation, the growth of S. thompsoni was demonstrated by the von Bertalanffy growth equation as $L_t=34.68(1-e^{-0.2113(t+0.7683)})$ for females and $L_t=29.79(1-e^{-0.2163(t+1.7964)})$ for males, $L_t=32.84(1-e^{-0.25(t+0.57)})$ for combined sex. Comparing with growth performance index(${\Phi}$) from these 4 offshore areas, parameter of S. thompsoni in Ulleungdo area was 2.4087, that of in Tong-yeong was 2.2835, that of in Aomori was 2.4077 and in Niigata was 2.3927. As a result, the value of Dokdo and Ulleungdo areas showed the highest.

중서부태평양 가다랑어(Katsuwonus pelamis)의 연령과 성장 (Age and Growth of the Skipjack Tuna Katsuwonus pelamis in the Western and Central Pacific Ocean)

  • 구정은;이성일;김진구;박희원;이미경;김장근;이동우
    • 한국수산과학회지
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    • 제48권3호
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    • pp.377-385
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    • 2015
  • The age and growth of the skipjack tuna Katsuwonus pelamis were determined using otoliths sampled from a Korean tuna purse seine fishery in the Western and Central Pacific Ocean from January 2005 to September 2006. A total of 312 otoliths were used to estimate the ages of skipjack tuna, which ranged from 1 to 7 years. The relationships between otolith ring radius (R) and fork length (FL) for female, male, and sex combined were FL = 19.74R + 1.50 ($r^2=0.54$), FL = 17.66R + 6.35 ($r^2=0.47$), and FL = 18.83R + 3.36 ($r^2=0.53$), respectively. The back-calculated fork lengths of each age ($FL_{year}$) were $FL_1=36.2cm$, $FL_2=43.3cm$, $FL_3=48.3cm$, $FL_4=52.6cm$, $FL_5=56.5cm$, $FL_6=60.8cm$, and $FL_7=63.2cm$. The relationships between fork length (FL) and total weight (TW) for female, male, and sex combined were $TW=0.00001FL^{3.19}(r^2=0.95)$, $TW=0.00001FL^{3.17}(r^2=0.95)$, and $TW=0.000009FL^{3.23}(r^2=0.95)$, respectively. The von Bertalanffy growth parameters of skipjack tuna estimated in this study were $L_{\infty}=77.4cm$, K = 0.176/year, and $t_0=-2.569years$.

묵납자루(Acheilognathus signifer) 정자의 냉동보존 (Cryopreservation of Common Korean Bitterling Acheilognathus signifer Sperm)

  • 정민환;민병화;박미선;명정인;임재현;임한규;황형규
    • 한국수산과학회지
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    • 제47권1호
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    • pp.39-44
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    • 2014
  • This study aimed to find an optimal diluent and cryoprotective agent (CPA) during cryopreservation of common Korean bitterling Acheilognathus signifier sperm. The bitterling is an endangered species in Korea, and this study will enable conservation and further technical development of artificial seed production. We tested the effects of cryopreservation and toxicity by the type of diluent and CPA. The optimal combination of diluent and CPA for cryopreservation was 300 mM glucose+10% methanol, resulting in a survival rate and sperm activity index (SAI) of $96.3{\pm}1.5%$, and $3.0{\pm}0.0$ respectively, and no significant difference compared to fresh sperm. The survival rate and SAI of post-thawed sperm was $9.7{\pm}1.5%$, $0.8{\pm}0.3$ respectively, which was significantly higher than had been achieved with other diluents and CPAs.

비균등한 어획노력량 및 샘플량인 경우의 SELECT 모델을 이용한 세고리물레고둥(Buccinum opisoplectum Dall)의 장구형 통발에 대한 망목선택성 : 예비분석 (Mesh selectivity of drum net traps for Buccinum opisoplectum Dall using SELECT model with unequal fishing and sampling efforts: A preliminary analysis)

  • 박해훈;;안희춘;김현영;정의철;신종근;차봉진;김인옥
    • 수산해양기술연구
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    • 제41권4호
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    • pp.279-288
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    • 2005
  • The mesh selectivity of drum net traps for Buccinum opisoplectum Dall caught in the eastern sea of Korea was described. Several experiments were conducted between July 2003 and March 2004 and the data obtained from the experiment was fitted by SELECT (Share Each Length class's Catch Total) model with unequal fishing and sampling efforts. The selection curve was determined to be 'estimated fishing efficiency' by model deviance rather than AIC. However the fishing efficiency between 20mm and 35mm mesh size did not seem to be different. The $L_{50}$ lengths of the selectivity for the 55mm and 75mm mesh size were 65.4mm and 96.0mm, respectively.

한국 남해에 서식하는 물가자미, Eopsetta grigorjewi (Herzenstein)의 재생산 연구 (Reproduction of the Shotted halibut in the southern Korean waters)

  • 차형기;강수경;최정화;오택윤;서영일
    • 수산해양기술연구
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    • 제47권3호
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    • pp.194-202
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    • 2011
  • Maturation and spawning of the Shotted halibut, Eopsetta grigorjewi was investigated based on the samples captured in South Korean waters from January 2008 to December 2009. Gonadosomatic index began to increase in December, and reached maximum between January to March. After spawning it began to decrease from May. Reproductive season was estimated to January-April, with peak in February. Fecundity was proportional to the size of the female, with the clutch size varying from 170,000 eggs in the smallest female (total length, 28.9cm) to 1,300,000 eggs in the largest (total length, 41.5cm). Size at 50% sexual maturity (TL50), determined from mature females, was 28.8cm. Annual reproductive cycles of this species could be divided into six successive stages; immature stage (May-October), nucleolus stage (November-January), yolk vesicle stage (January-February), vitellogenic and ripe stage (January-April) and spent stage (April-May).

한국 근해 쌍끌이대형저인망어업의 어장 변화 (Changes of Fishing Ground of the Large Pair Trawl Fishery off Korean Waters)

  • 이동우;최광호;강수경
    • 한국수산과학회지
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    • 제46권6호
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    • pp.917-922
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    • 2013
  • Changes in fishing ground of the large pair trawler were investigated by year, month and species off Korean waters. We used catch data by sea-block lat.${\times}$long.:$30^{\prime}{\times}30$) of the National Fisheries Research and Development Institute (NFRDI) and monthly fishing production statistics of Korean statistic information service from 1990 to 2007. In the 1990s, the demersal fish like Larimichthys polyactis, Collichthys sp, Portunus trituberculatus and Muraenesox cinereus were the dominant species, and in the 2000s, they were changed from demersal fish into pelagic fish like Scomberomorus niphonius, Scomber japonicus, Engraulis japonicus and Todarodes pacificus. Species composition of catch showed temporal variation by cluster analysis deviding into 4 period, 1990-1994, 1995-2000, 2001-2003 and 2004-2007. Fishing ground in the 2000s was decreased up to 2/3 in the 1990s, while the density of catch in the fishing ground in 2000s was higher than the 1990s.

한국 남해에 분포하는 갯장어(Muraenesox cinereus)의 연령과 성장 (Age and Growth of Daggertooth Pike Conger Muraenesox cinereus in the South Sea of Korea)

  • 고은혜;권대현;김영혜
    • 한국수산과학회지
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    • 제52권6호
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    • pp.650-655
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    • 2019
  • The age and growth of Muraenesox cinereus collected in the South Sea of Korea by Danish seine and coastal Long-line fisheries were determined from right sagittal otoliths between May 2018 and April 2019. Otoliths of 353 fish were observed under reflected light, and the edges of the opaque zone were considered to be the otolith ring. Monthly changes in the marginal index indicated that rings (opaque zones) were formed once a year from June to July. The estimated von Bertalanffy growth equation with growth parameters estimated from non-linear regression were Lt=138.37 (1-e-0.18(t+0.79)) for females and Lt=99.00 (1-e-0.13(t+3.99)) for males. The oldest female M. cinereus was 12 years old, and the oldest male was 8 years old.

한국 다랑어 연승어업에 의한 태평양해역 눈다랑어 자원의 단위노력당어획량 (CPUE)의 표준화 (Standardization of Catch per Unit Effort (CPUE) for Bigeye Tuna (Thunnus obesus) by the Korean Longline Fishery in the Pacific Ocean)

  • 유준택;황선재;안두해;김종빈;김장근
    • 한국수산과학회지
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    • 제43권6호
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    • pp.740-746
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    • 2010
  • This study standardized the catch per unit effort (CPUE) of bigeye tuna (Thunnus obesus) caught by the Korean longline fishery in the Pacific Ocean. The study used a general linear model (GLM) to standardize the CPUE using catch and effort data aggregated by year, month, and $5{\times}5$ degrees of latitude and longitude in the tropical Pacific Ocean from 1982 to 2008 (except for 1988 and 1989). Explanatory variables in the GLM analysis included year, month, subtropical area, and number of hooks between floats (HBF). The study area and HBF were subdivided into three subtropical areas and six classes, respectively. During the study period, the standardized CPUE was significantly related to the nominal CPUE. The standardized CPUE declined sharply, as compared to the nominal CPUE, after the mid 1990s. In particular, the decline in the standardized CPUE in all subtropical areas in the 2000s was clearer than that of the nominal CPUE.

한국고용직업분류에 의한 수해양산업의 직업분류에 관한 연구 (A Study on Standard Classification of Fisheries Occupation by KECO)

  • 김삼곤;김종화
    • 수산해양교육연구
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    • 제19권3호
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    • pp.329-345
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    • 2007
  • The purpose of this study was to classify the standard classification of fishery occupations base on KECO(Korean Employment Classification of Occupation) in Korea. The result of this study was as follows. First ranks was fisheries duties, second ranks were classified into five categories. That were administration duties management duties financial affairs duties, social service duties marketing duties individual service duties, construction duties civil engineering duties, machinery duties manufacture duties repairing duties, production duties. Third ranks classify based on second ranks. Administration duties management duties financial affairs duties were classified fishery administration, fishery management, fishery financial affairs. Social service duties marketing duties individual service duties were classified fishery social service, fishery marketing, fishery individual service. Construction duties civil engineering duties were classified fishery construction, fishery civil engineering. Machinery duties manufacture duties repairing duties were classified fishery machinery duties, fishery manufacture, fishery repairing. Production duties were classified fishery processing, marine products, fishery environment. Fourth ranks was classified according to third ranks.

수온별 저산소 노출에 따 른 조피볼락 (Sebastes schlgeli)의 혈액성상 변화 (Changes of Blood Parameters in Korean rockfish Sebastes schlegeli Subjected to Acute Hypoxia at Different Water Temperatures)

  • 지보영;도용현;민병화;박미선;황형규;명정인;조재권
    • 환경생물
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    • 제33권4호
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    • pp.412-418
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    • 2015
  • $12^{\circ}C$에서 DO 농도가 $0.7mg\;L^{-1}$일 때 조피볼락의 폐사가 발생하였으며, 소요시간은 274분이었다. $20^{\circ}C$에서는 DO 농도가 $0.8mg\;L^{-1}$일 때 조피볼락의 폐사가 발생하였으며, 소요시간은 148분이었다. DO 농도의 감소는 스트레스 요인으로 작용하여 $12^{\circ}C$$20^{\circ}C$에서 1차적으로 코티졸 및 글루코스 농도를 상승시켰다. 또한 Ht, Hb, AST, ALT, 이온 농도, 삼투질 농도도 $12^{\circ}C$$20^{\circ}C$에서 폐사 직전에 증가하는 경향을 보였다.