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가공공장에서 수행한 한국 다랑어 선망 어획물 종조성에 대한 예비 연구
이성일 ( Sung Il Lee ),김장근 ( Zang Geun Kim ),손호선 ( Haw Sun Sohn ),유준택 ( Joon Taek Yoo ),김미정 ( Mi Jung Kim ),이동우 ( Dong Woo Lee ),김두남 ( Doo Nam Kim ),문대연 ( Dae Yeon Moon ) 한국어업기술학회 2011 수산해양기술연구 Vol.47 No.4
A preliminary study on species composition of a Korean purse seine catch landed at cannery was conducted in April 2011. In the cannery, all tuna catch are sliding through a sorting grid panel that filters and drops fish in the buckets by size class (above 9kg, 3.4-9kg, 1.8-3.4kg, 1.4-1.8kg and below 1.4kg). In cannery processing, species sorting was made for skipjack tuna and yellowfin tuna only from catches greater than 3.4kg during filtering but not for bigeye tuna because of difficulties in species identification between bigeye tuna and yellowfin tuna under frozen state. As no species identification was carried out for catch groups less than 3.4kg in the cannery process, this study focused on sorting out skipjack tuna and yellowfin tuna from these groups and then identifying bigeye tuna from all size groups of yellowfin tuna. Using the mixture rate of species obtained from the samples taken, species composition of the landed catch was estimated. As results, cannery research showed 95% for skipjack tuna, 3% for yellowfin tuna and 2% for bigeye tuna in species composition, while vessel logbook data represented 96%, 3% and 1% for skipjack tuna, yellowfin tuna and bigeye tuna, respectively. The proportion of bigeye tuna identified in the cannery was slightly higher than shown in logbook data by 1%.
날개다랑어(Thunnus alalunga) 치어의 국내 출현
유준택 ( Joon Taek Yoo ),김장근 ( Zang Geun Kim ),김진구 ( Jin Koo Kim ),유정화 ( Jung Hwa Ryu ) 한국수산과학회 2012 한국수산과학회지 Vol.45 No.2
A single juvenile specimen of Thunnus alalunga (8.4 mm in standard length) of the Scombridae was collected from the southeast sea of Jeju Island (127.7˚E, 33.0˚N) on August 18, 2011. It was identified as T. alalunga based on the following combination of morphological characters: snout elongated; melanophores focused on the dorsal spiny region, but no melanophores on the dorsal soft fin base, anal fin base or caudal region.
윤갑동 ( Gab Dong Yoon ),김장근 ( Zang Geun Kim ),최영민 ( Young Min Choi ) 한국수산학회 1996 한국수산과학회지 Vol.29 No.1
우리나라 연안에 분포되어 있는 주요 어업대상어종의 자원량을 측정하기 위한 기초자료를 얻기 위하여 南海東部沿岸에 分布하는 멸치魚群을 對象으로 Split beam 어군탐지기를 이용하여 in situ TS를 測定한 결과를 요약하면 다음과 같다. 본 조사에서 演獲物의 95%가 멸치였으며, 그 體長頻度 分布는 體長範圍 13.6~15.4cm, 平均體長 14.4cm이었고, 體重頻度 分布는 體重範圍 16~28g, 平均體重 21.9g이었다. 2. 멸치의 반사강도는 수심 10~30m에서 -40.7~-69.2dB, 30~50m 水層에서 -42.2~-67.7dB, 10~50m 水層에서 -42.2~-67.7dB의 범위였고, 그 빈도분포에는 2개의 mode가 명확하게 분리되어 나타났다. 3. 멸치의 평균반사강도는 -49.7dB/fish 및 -33.1dB/kg 이었으며, 90% 信賴區間은 1dB 이하였다. 또한, 멸치의 반사강도 (TS)와 체장(cm)과의 관계는 다음과 같았다. TS=20log L-72.9. The in situ target strength for the anchovy (Engraulis japonica) were measured by the split beam echo sounder system at 38 kHz. This study allowed us to detect the single echos from anchovy shoals which were dispersed during trawling operation in day time. The results of our study were as follows: We found that the anchouy occupied about 95% of the total catch from the detected shoals from which target strength data were collected. Length distribution of anchovy showed a mode and ranged from 13.6 to 15.4cm with a mean of 14.4cm and a standard deviation of 0.45cm, and weight distribution showed a mode and ranged from 16 to 28g witha mean of 21.9g and a standard deviation of 2.7g. The target strength distribution of anchovy ranged from -40.7dB to -69.2dB in the water layer of 10~30m, -42.19 to -67.7dB in the 30~50m and -42.2 to -67.7dB in 10~50m, showing 2 modes in each layer, respectively. Overall mean target strengths were -49.7dB/fish and -33.1dB/kg, averaged by area backscattering cross section (σ), and the confidence interval for target strength was less than 1dB. With the mean total length and the mean target strength, we drived the target strength-length relationship as TS (σ)=20Log L-72.9.
목시조사(Sighting survey)에 의한 동해 봄철 해양성 조류의 분포 양상
김현우 ( Hyun Woo Kim ),김장근 ( Zang Geun Kim ),최석관 ( Seok Gwan Choi ) 한국환경생태학회 2011 한국환경생태학회지 Vol.25 No.2
2007년 4월부터 5월까지 시험조사선을 이용하여 동해의 해양성 조류 분포조사를 실시하였다. 조사 기간 동안 동해 연안에서 총 10과 23종 1,379개체의 조류가 관찰되었으며, 이 중 6과 14종 1,324개체는 해양성 조류였다. 해양성 조류의 발견율은 2.5 birds ㎞-2였다. 가장 높은 발견율을 보인 종은 슴새(Calonectris leucomelas)로 전체 관찰개체수의 74.5%를 차지하였다. 이밖에 발견된 조류 중 1% 이상을 차지한 주요종은 바다쇠오리(Synthliboramphus antiquus)(8.3%), 아비(Gavia stellata)(5.0%), 제비갈매기(Sterna hirundo)(2.1%), 회색머리아비(Gavia pacifica) (2.0%), 괭이갈매기 (Larus crassirostris)(1.1%) 순으로 나타났다. 해양성 조류의 개체수는 동해 중남부 해역인 36°N~37°N 사이에서 가장 많았으나 종다양도 지수(H``)는 동해 남부 해역인 35°N~36°N에서 가장 높은 값을 보였다. 발견된 대부분의 종은 해안선에서부터 멀어질수록 발견율이 줄어들었다. 발견된 주요종 이외에도 뿔쇠오리(Synthliboramphus wumizusume), 흰부리아비(Gavia adamsii), 쇠부리슴새(Puffinus tenuirostris), 붉은발슴새(Puffinus carneipes)와 같은 희귀종을 관찰하였다. 본 조사와 동시에 행해진 밍크고래(Balaenoptera acutorostrata) 목시조사의 자료를 통해 볼 때 슴새의 분포 패턴과 밍크고래의 분포 패턴 사이에서 높은 상관관계를 나타냈다. 아비류(Gavia spp.)의 분포는 공간적으로 분리되는 양상을 보였다. Seabird distribution in the East Sea was studied from April to May 2007 using line transect counts. We observed a total of 1,379 individuals of 23 species including 14 species of seabird. The overall seabird sighting rate was 2.5 birds ㎞-2. The Streaked shearwater(Calonectris leucomelas)(74.5%) was the numerically dominant species. Ancient murrelets(Synthliboramphus antiquus)(8.3%), red-throated divers(Gavia stellata)(5.0%), common terns(Sterna hirundo)(2.1%), Pacific divers(Gavia pacifica)(2.0%), and black-tailed gulls (Larus crassirostris)(1.1%) were also frequently observed. The sightings of seabirds was highest between 36°N and 37°N of the coastal area of the Korean peninsular. However, the index of species diversity(H``) was higher between 35°N and 36°N. The sighting rates of most observed species decreased with distance from the coastline. The distribution patterns of Streaked shearwater were linked to the variation in the distribution pattern of minke whales(Balaenoptera acutorostrata). Also, spatial segregation was found in the distributions of the two species of divers(Gavia spp.).
한국 미기록종 넓적꼬리도둑갈매기(Stercorarius pomarinus)의 국내 관찰기록
김현우(Hyun Woo Kim),안용락(Yong-Rock An),김장근(Zang-Geun Kim),최석관(Seok-Gwan Choi) 한국조류학회II 2009 한국조류학회지 Vol.16 No.1
2008년 1월 8일과 9일 양일간 넓적꼬리도둑갈매기(Stercorarius pomarinus) 3개체를 울산 연안에서 관찰하였다. 발견된 개체 중 2개체는 성체였으며 1개체는 미성숙개체로 판단되었다. 본종은 국내에 공식적인 기록이 없던 종으로 한국미기록종으로 보고한다. Three individuals of Pomarine Skuas (Stercorarius pomarinus) were observed on the southern part of the East Sea, off Ulsan city, on 8th and 9th January 2008. Two individuals were adults. One individual was supposed to be a juvenile. This was the first record in Korea.