• Title, Summary, Keyword: 봉수망

Search Result 7, Processing Time 0.085 seconds

꽁치봉수망어업 어획 실태와 소나 사용에 따른 어획 효과

  • 조현수;문대연;김영승;이주희;김형석
    • Proceedings of the Korean Society of Fisheries Technology Conference
    • /
    • /
    • pp.67-70
    • /
    • 2003
  • 우리나라는 1985년 이전에는 자망어업 등에 의해 동해안에서만 꽁치를 어획하였으나, 1985년부터 꽁치봉수망어업의 시작으로 북서태평양에서도 꽁치를 어획하게 되었다. 꽁치봉수망어업이 본격적으로 시작된 1990년 이후에는 출어선과 어획량이 증가하여 1997년의 경우30척 출어, 4만톤 어획하여 최고치를 기록하였으나, 최근에는 어획량이 감소하여 2만톤 수준을 유지하고 있다. (중략)

  • PDF

꽁치봉수망 집어등 불빛의 수중 투과 특성

  • 조현수;김두남;조영복;이주희;김형석;양원석;안희춘
    • Proceedings of the Korean Society of Fisheries Technology Conference
    • /
    • /
    • pp.71-74
    • /
    • 2003
  • 주광성이 있는 어족을 밀집시켜 어획하기 위하여 사용되는 집어등은 어류 중 불빛에 유집이 잘 되는 멸치, 오징어 및 꽁치 둥을 대상으로 하는 어업에서 주로 사용된다. 어장에 분산되어 있는 어류에 집어등을 투사하면, 농밀하게 어군을 형성하게 되므로 효과적인 어획이 가능하게 된다. 본 연구에서는 꽁치봉수망 조업시 어선의 집어등에 의한 수중 환경의 변화를 구명하여 광환경이 꽁치의 어획에 미치는 영향을 분석하기 위한 기초 단계로 꽁치봉수망 어선의 집어등 수중 조도를 측정하여 꽁치가 분포하는 어획수심의 광환경을 분석하였다. (중략)

  • PDF

Influence of Moon Light to the Fishing of Pacific Saury Stick-held Dip Net Fishery (꽁치봉수망어업에 있어서 달빛이 어획에 미치는 영향)

  • Jo, Hyun-Su;Mun, Dae-Yeon;Baik, Chull-In;Lee, Ju-Hee;Kim, Hyung-Seok
    • Journal of the Korean Society of Fisheries and Ocean Technology
    • /
    • v.41 no.2
    • /
    • pp.107-112
    • /
    • 2005
  • In order to investigate influence of moon light to the fishing of Pacific saury stick-held dip net fishery in the northwestern Pacific Ocean, casting number, catch and CPUE were analyzed between the full moon and the new moon phases. Based on analyses of data taken from 8 vessels during 1992~2002, casting numbers at the full moon phase and the new moon phase were 110.3 and 121.0 times, respectively, and the first was lower than the latter by 8.8%. Catches of the full moon phase were higher than the new moon phase by 12.5% and CPUE expressed in ton/day and ton/haul were also higher by 31.5%, 26.1% respectively.

Transmittance Properties of Fishing Lamp in Stick-held Dip Net Fishing Vessel for Pacific Saury (꽁치봉수망 집어등 불빛의 수중 투과 특성)

  • Jo, Hyun-Su;Kim, Doo-Nam;Cho, Young-Bok;Lee, Ju-Hee;Kim, Hyung-Seok;Yang, Won-Seok;An, Heui-Chun;Han, Jin-Seok
    • Journal of the Korean Society of Fisheries and Ocean Technology
    • /
    • v.40 no.1
    • /
    • pp.23-28
    • /
    • 2004
  • The transmittance properties of fishing lamp in stick-held dip net fishing vessel for Pacific saury was investigated during nighttime operations in the North Pacific on May 19 and 24, 2003. The incandescent lamps of red color (750W${\times}$100) and halogen lamps (750W${\times}$521) were used as a fishing lamp for gathering Pacific saury. The relative irradiance of red incandescent lamp and halogen lamp in the air showed peak in 1,052nm of wave length. However, the irradiance of halogen lamp below 600nm of wave length was higher than that of incandescent lamp. The relationship between underwater illuminance (Y) and water depth (X) of sunlight in the observation areas A (37$^{\circ}$ 11'N, 178$^{\circ}$ 46'W) and B (31$^{\circ}$ 11'N, 178$^{\circ}$ 01'E) is represented as follows; $Y=2572.2{\cdot}e^{-0.0721X},\;R^2=0.9915$ $Y=3312.4{\cdot}e^{-0.0619X},\;R^2=0.9837$ The distribution of underwater illuminance of observation areas A and B showed low value of 0.31x and 0.61x in 50m depth, respectively. In the fishing grounds of Pacific saury, the light intensity of distribution depth was above 0.51x.

Relationship Between the Catch of the Pacific Saury and the Water Temperature in the Northwest Pacific Ocean (북태평양 꽁치 봉수망 어획량과 수온과의 관계)

  • 조현수
    • Journal of the Korean Society of Fisheries and Ocean Technology
    • /
    • v.32 no.3
    • /
    • pp.249-256
    • /
    • 1996
  • The saury stick - held dip net fishery of Korea in the Northwest Pacific Ocean began in 1985 with 3 vessels. Since then the fishery has grown so rapidly year by year that the number of vessels increased to 34 and the catch to 40 thousands Mff in 1993. In the present study, the monthly situation and the movement of the fishing ground for the pacific saury in the Northwest Pacific were investigated and the monthly optimum fIshing tempertures were estimated, from the relationship between the catch and the sea surface temperature. In the beginning of the fishing season, June to August, the fIshing ground is formed in the very wide range, mainly in the northward area of the front meandering, as the parcific saury migrate northward. In the main season, September to November, the ground is formed in the southward area of the front, off the east coast of Japan. Andd then, the fishing season ends in December with the ground coming near to the east coast of Japan. The monthly optimum fishing tempertures showed 11~$13^{\circ}C.$ in June to July, 13-$17^{\circ}C.$ in August to November, and 15~ $17^{\circ}C.$ in December in general. The profIles of water temperature were much different in accordance by net casting position in the fishing ground, regardless of season. So, the MLD and CPUE was analyzed to find out the relation between the water temperature and the catch. Then, it is found that the CPUE shows over 0.7Mtr/haul as the MLD 40~70m.40~70m.

  • PDF

Analysis on the Present Condition of the Korean Stick-held Dip Net Fishery for Pacific Saury in the North Pacific Ocean (북태평양 한국 꽁치봉수망어엽의 현황 분석)

  • Jo, Hyun-Su;Moon, Dae-Yeon;Kim, Yeong-Seung;Lee, Ju-Hee;Kim, Hyung-Seok
    • Journal of the Korean Society of Fisheries and Ocean Technology
    • /
    • v.40 no.2
    • /
    • pp.97-103
    • /
    • 2004
  • This paper presents a general overview of the Korean stick-held dip net fishery for Pacific saury operated in the North Pacific Ocean since 1985. Annual catches, annual centroids distribution of fishing ground, and optimum fishing temperatures were compared between the periods before and after the new Korea-Japan bilateral fishery arrangement established in 1998. Fishing usually began in May and ended by December, during which major catches were taken in the months September~November before the bilateral fishery arrangement between Korea and Japan, whereas in August~October after the arrangement. It was observed that after the arrangement the centroids of fishing ground was shifted from the usual fishing area off the east coast of Japan to the east of South Kuril Islands, 45$^{\circ}$N and 151$^{\circ}$E. Optimum fishing temperatures appeared to be different by month ; 12.5~14.4$^{\circ}C$ in May, 12.0~14.2$^{\circ}C$ in June, 11.4~13.9$^{\circ}C$ in July, 11.4~15.9$^{\circ}C$ in August, 12.9~16.9$^{\circ}C$ in September, 12.7~17.3$^{\circ}C$ in October, 13.1~17.6$^{\circ}C$ in November, and 15.0~19.1$^{\circ}C$ in December. A total of 13 species were caught during scientific observation periods but the target species, Pacific saury, accounted for about 99.9% of the total catch. Although there was no difference in fishing days between those vessels equipped with the sonar and those without sonar, number of set, total catch, and CPUE of those with sonar were higher than those without sonar by 13%, 26%, and 12%, respectively.