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북태평양 중부공해에서 조업하는 다랑어연승어구의 모릿줄 재질에 따른 침강수심
조현수 ( Hyun Su Jo ),황선재 ( Seon Jae Hwang ),이지훈 ( Ji Hoon Lee ),안두해 ( Doo Hae An ),문대연 ( Dae Yeon Moon ) 한국어업기술학회 2011 수산해양기술연구 Vol.47 No.3
The purpose of this paper is to provide useful information for fishermen in the manner of investigation a sinking speed of current type tuna longline gear at the North Pacific Ocean as a new developed tuna longline fishing ground. The sinking depth of mainline in connection with different basket was investigated. The experiments were also performed with different materials such as Supermansen (i.e., PE) and Hitech (i.e., PA) for the mainline to investigate the sinking depth of mainline and hooks. Furthermore, the relation between the sinking depth of hooks and catches are investigated also. The sinking depth of mainline at the first and the last shooting basket shows deeper than that of middle part of a basket due to reduced shortening ratio. The sinking depth of mainline and hook with Hitech material shows more shallow than that of Supermanse material, even the Hitech case was designed to sink deeper than that of Supermanse case. The highest catches arise at the middle part basket as the hook number 7 with around 248m sinking depth. From the results, longline with Hitech material is needed to increase the sinking force for reaching the relevant sinking depth. Moreover, the current strength at the North Pacific Ocean will be considered for further commercial fishing.
왕돌초 해역에서 홑자망과 삼중자망에 의한 어획물의 종조성 및 계절 변동
이성일 ( Sung Il Lee ),황선재 ( Seon Jae Hwang ),양재형 ( Jae Hyeong Yang ),심정민 ( Jeong Min Shim ) 한국어류학회 2008 韓國魚類學會誌 Vol.20 No.4
왕돌초 해역에 출현하는 어종들의 계절 변동을 알아보기 위해 2002년부터 2004년까지 홑자망과 삼중자망어구를 사용하여 어획물의 종조성과 양적 변동을 분석하였다. 조사기간 동안 출현한 어종수는 총 15목 34과 58종으로 쏨뱅이목(Scorpaeniformes)과 농어목(Perciformes) 어종이 전체 출현종수의 62.1%를 차지하여 가장 많았고, 홑자망에서는 11목 22과 35종이, 삼중자망에서는 15목 30과 51종이 출현하였다. 계절별 출현종수는 수온이 높은 여름철과 가을철에 각각 32종과 31종으로 많았고, 수온이 낮은 겨울철에 19종으로 가장 적었다. 채집된 개체수 및 생체량은 각각 총 5,295개체, 1,891 kg으로, 여름철과 가을철에 높았고 겨울철과 봄철에 낮았으며, 주요 우점종은 임연수어(Pleurogrammus azonus)와 대구(Gadus macrocephalus), 기름가자미(Glyptocephalus stelleri), 불볼락(Sebastes thompsoni), 빨간 횟대(Alcichthys alcicornis), 조피볼락(Sebastes schlegeli)으로 이 종들은 조사기간 동안 거의 지속적으로 출현하여 본 해역의 주거종으로 나타났다. Seasonal variation of species composition in the coastal waters off Wangdol-cho were investigated using the catches by gill net and trammel net from 2002 to 2004. A total of 58 species was collected and classified into 15 orders and 34 families. Of the 58 species identified, Scorpaeniformes and Perciformes accounted for 62.1% of the species. 35 species in 11 orders and 22 families were collected by gill net and 51 species in 15 orders and 30 families were collected by trammel net. The number of species was high in summer and autumn and lowest in winter. Catches were correlated with sea water temperature. The numbers of individuals and their biomass were 5,295 inds. and 1,890 kg, with the highest values achieved in summer and the lowest in spring. The most dominant species were Pleurogrammus azonus and Gadus macrocephalus. The seasonal species community showed a high similarity between summer and autumn.
진해만 남서부에 출현하는 자치어 군집의 종조성과 계절변동
허성회 ( Sung Hoi Huh ),한명일 ( Myung Il Han ),황선재 ( Seon Jae Hwang ),박주면 ( Joo Myun Park ),백근욱 ( Gun Wook Baeck ) 한국어류학회 2011 韓國魚類學會誌 Vol.23 No.1
진해만 남서부에 출현하는 자치어 종조성의 계절변동을 연구하기 위하여 2009년 1월에서 12월까지 매월 RN80 네트을 이용하여 시료를 채집하였다. 조사 기간 동안 24과 46종의 자치어가 채집되었다. 우점종은 청어(Clupea pallasii), 쥐노래미(Hexagrammos otakii), 전어(Konosirus punctatus), 멸치(Engraulis japonicus), 청베도라치(Parablennius yatabei), 앞동갈베도라치 (Omobranchus elegans) 순으로 많이 채집되었는데 이들 6종은 전체 채집개체수의 92.7%를 차지하였다. 어종수, 채집 개체수, 종다양도지수는 뚜렷한 계절 변동을 나타내었다. 종수와 개체수는 각각 7월과 1월에 가장 높은 값을 나타내었다. 주성분분석(PCA)와 상관분석은 군집구조와 우점종들의 출현량이 수온과 유의한 관계가 있음을 보여주었다. 특히, 청어, 쥐노래미, 멸치, 청베도라치의 출현량은 수온과 유의한 관련성이 있었다. Seasonal variation in species composition and abundance of fish larvae assemblages in the south-western Jinhae Bay were investigated monthly in 2009. During the study period, 49 larvae species belonging to 24 families were collected. The dominant species were Clupea pallasii, Hexagrammos otakii, Konosirus punctatus, Engraulis japonicus, Parablennius yatabei, and Omobranchus elegansei. These six species accounted for 92.7% of the total number of individuals collected. The number of species, number of individuals, and species diversity indices fluctuated with the seasons. The peak number of species and individuals occurred in July and January, respectively. Principal component analysis (PCA) and correlation analysis showed that variation in monthly water temperature could act as an indicator of seasonal variation in community structure and abundance of the dominant species; in particular, those of C. pallasii, H. otakii, E. japonicus and P. yatabei corresponded with the water temperature.