• 한국어류학회지
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• 제33권4호
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• pp.273-277
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• 2021

한국 서해에 출현하는 용가자미 (Cleisthenes pinetorum)의 섭식습성에 대한 연구를 위해 2019년 1월부터 12월까지 자망어선에서 어획된 360개체(전장 21.7~48.1 cm) 위내용물을 분석하였다. 용가자미의 주 먹이생물은 거미불가사리류와 어류로 나타났고, 이외에도 새우류, 난바다곤쟁이류, 단각류, 게류 등을 소량 섭식하였다. 이러한 연구의 결과는 고리연안에서 보고된 용가자미의 섭이 습성 결과와 차이를 보였다(Huh and Baeck, 2003). 용가자미가 성장함에 따라 거미불가사리류의 비율이 감소하고 어류의 비율이 증가하였고, 용가자미 전장이 증가하면서 개체수와 습중량은 증가하는 경향을 보였다.

• 한국수산과학회지
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• 제55권5호
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• pp.575-582
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• 2022

This study revealed the reproductive biology of pointhead flounder Cleisthenes pinetorum, in the middle of the West Sea of Korea. We collected samples using gill net and drag net fisheries in coastal waters from January to December 2019. Mmonthly gonodosomatic index and maturity stage results showed that the spawning period was October to December, and the females grew faster than the males. The fecundity ranged from 16,728 to 1,039,616 number of eggs, and the relationship between TL and fecundity (F) was 0.0000003TL^4.7434 (R²=0.4898). The size-frequency distribution of eggs suggested that C. pinetorum spawm once during a spawning period. The length at 50% maturity for females was estimated to be 18.9 cm.

• 한국어류학회지
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• 제23권3호
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• pp.187-197
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• 2011

울진과 후포 연안의 수심 20~50m에서 2002년 계절별로 otter trawl을 이용하여 어류를 채집하여 계절에 종조성 변화와 우점종의 체장조성 분석하였다. 울진 연안에서는 총 20종, 1,927마리, 53,969g의 어류가, 후포 연안에서는 총 23종, 2,762마리, 146,550g의 어류가 채집되었다. 두 조사 지역 모두에서 물메기(Liparis tessellatus), 기름가자미(Glyptocephalus stelleri)와 용가자미 (Cleisthenes pinetorum)가 우점하였으며, 이 3종이 울진 연안 채집 개체수의 70.9%와 생체량의 83.8%를 차지하였고, 후포 연안에서는 각각 90.3%와 70.9%를 차지하였다. 동해 중부 연안에서 정치망이나 자망에는 회유성 부어류들이 주로 채집되어 계절에 다른 변동 폭이 켰으나, 울진-후포 연안의 otter trawl에 채집된 어류는 정착성 저어류들이 전 계절에 우점도가 높아 계절변동이 뚜렷하지 않았다. 우점종인 기름가자미와 용가자미는 약 2~3세어가 주를 이루었으며, 수심에 따른 크기분포에 의하면 이 어류는 자라면서 대륙붕의 수심이 보다 깊은 곳으로 이동하는 것으로 추정된다.

• 수산해양기술연구
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• 제48권4호
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• pp.310-321
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• 2012

There are many studies of the biodegradable net for fishing to prevent marine pollution in Korea and the snow crab gill nets is developed effectively. Recently, the biodegradable gill net for fishes is being developed. This study is the experiment of the catch characteristics for the biodegradable flounder gill net. The 8 experiments were carried out using the nylon gill net and the biodegradable gill net in from August to October, 2011 in the southern East Sea. The results obtained from the above approaches are summarized as follows; A total of 16 species was caught with most dominant species of Cleisthenes pinetorum followed by Liparis tanakai, Glyptocephalus stelleri, Buccinum striatissimum and Dasycottus setiger. A total of catch of the nylon net was 342,885g and that of the biodegradable net was 236,857g. Thus catch of the nylon net was 1.45 times more than that of the biodegradable net. The length composition of Cleisthenes pinetorum, caught by the biodegradable net was very similar to that of nylon. As a result of analysis on the effect of submerged time, small fish escaped more easily than large fish as the submerged time is getting longer. And catches of the biodegradable net was less than the nylon net's as higher as wave height. Wave height was more influential factor for fishing capacity than submerged time based on the results of a comparison between catch difference of two kinds of gill nets and catch characteristics.

• 한국어류학회지
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• 제30권1호
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• pp.36-45
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• 2018

본 연구는 동해 중부 후포 연안에 서식하는 어류 군집의 계절 및 수심에 따른 차이를 분석하였다. 연구에 사용된 어류 시료는 2011년과 2017년 사이에 계절별로 저층자망과 삼중자망을 이용하여 채집하였다. 총 17과에 속하는 46종의 어류가 채집되었고, 정점 A (수심 약 80 m)에서 36종, 정점 B (수심 약 140 m)에서는 22종이 채집되었다. 현존량에서 우점종은 기름가자미(Glyptocephalus stelleri), 용가자미(Cleisthenes pinetorum), 대구횟대 (Gymnocanthus herzensteini), 고무꺽정이(Dasycottus setiger) 였는데, 전자의 3종은 얕은 수심(정점 A)에서 더 많이 채집되었고, 후자 1종은 깊은 수심(정점 B)에서 현존량이 더 높았다. 조사해역 어류 군집의 종수, 현존량, 생체량, 종다양도는 수심에 따라 변하였지만, 시간(계절 또는 연도)에 따라 유의한 차이는 없었다. ANOSIM (Analysis of similarity) 결과 또한 어류 군집 구조는 수심에 따라 차이가 유의하였지만, 연도 또는 계절에 따라 유의한 차이가 없는 것으로 보여주었다. nMDS (Non-metric multidimensional scaling) 결과는 이러한 군집 구조가 시각적으로 뚜렷이 구분되었고, 이러한 구분은 수심과 수온 차이에 따른 우점종의 공간분포 차이 때문으로 설명할 수 있었다.

• Fisheries and Aquatic Sciences
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• 제3권1호
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• pp.14-22
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• 2000

The relationship between the distribution of demersal fishes and that of the water masses was examined by using the catches data and hydrographic data in the Yellow Sea and the East China Sea on May 13-19, 1996 and May 10-17, 1997. During the study period, the dominant fish species were Cleisthenes pinetorum herzinsteini, Lophiomus setigerus and Pseudosciaena polyactis. These three low temperature water species accounted for $21-24\%$ of the total catches. The percentage of the low temperature water species was high in the Yellow Sea and the coastal area on the continental shelf of the East China Sea but was low in the vincinity of Kyushu during the study period. In the East China Sea, the isotherm of $15^{\circ}C$ at 50m, mid layer depth, was located more southeast in 1996 than in 1997. The bottom water temperature was about it lower in 1996 than in 1997. The direction of the detided current on the continental shelf of the East China Sea was southward in 1996 and northward in 1997. Yellow Sea Bottom Cold Water (YSBCW) strongly expanded to south in 1996 when the northward current was weak. But, Tsushima Warm Current (TSWC) strongly intruded into the continental shelf of the East China Sea in 1997. As YSBCW expanded strongly to south in 1996, the percentage of the low temperature water species relative to the total catches was high. But, TSWC strongly intruded and the percentage of low temperature water fishes was low in 1997.

• 수산해양기술연구
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• 제49권2호
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• pp.95-105
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• 2013

Physical characteristics of net filament were investigated to test the fishing capacity of gill nets due to the flexibility difference between nylon and biodegradable nets (PBS 95%+PBAT 5% and PBS 80%+PBAT 20%). In addition, a total of 16 fishing experiments were conducted in the coastal waters of Jeongja, Ulsan, from August 10 to October 20, 2011 and from September 11 to November 3, 2012. The test results showed that nylon net filament exhibited more flexibility than biodegradable net filament when they were wet. Accordingly, the longer submerged time, the more fishing capacity the nylon gill nets demonstrated in comparison with the biodegradable gill nets. A total of 16 species were caught in 2011 with the nylon gill nets (1,323 fishes, weighing 342,885g) and the biodegradable gill nets (958 fishes, weighing 236,857g). 15 species were caught in 2012 with the nylon gill nets (1,582 fishes, weighing 448,360g) and the biodegradable gill nets (1,431 fishes, weighing 406,590g). Thus catch weights and the number of fish caught produced by the nylon nets were 1.45 times and 1.38 times higher than those of the biodegradable nets produced in 2011, and 1.1 times and 1.11 times higher in 2012. A test on the target species, pointhead flounder (Cleisthenes pinetorum) has similar results. The flexibility of a net was proved to be related to the fishing capacity, and as a result, it is concluded that the higher flexibility, the higher fishing capacity.

• 수산해양기술연구
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• 제55권4호
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• pp.335-348
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• 2019

We found ten species of larvae belonging to the family Pleuronectidae as a result of analysis on ichthyoplankton collected monthly from the East Sea, Yellow Sea, Korea Strait and East China Sea between February 2016 and May 2018 using bongo net. The ten species of pleuronectid larvae were divided into three groups in morphology. Group A had three or four bars on the lateral side of the tail: Glyptocephalus stelleri, G. kitaharae, Pseudopleuronectes yokohamae, and Hippoglossoides dubius. Group B had a row of melanophores along the dorsal and ventral side of tail: Cleisthenes pinetorum, Eopsetta grigorjewi, Dexistes rikuzenius, and Platichthys bicoloratus. Group C had dense melanophores which are covering trunk and tail entirely except caudal peduncle: Platichthys cornutus and Platichthys japonicus. The three groups did not associate with previous molecular phylogenetic studies except for the G. stelleri and G. kitaharae of the group A.

• 수산해양기술연구
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• 제50권1호
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• pp.1-11
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• 2014

To compare the catches made using gillnets, trammel nets, and gillnets with supporting lines, several experiments were conducted with commercial vessels near Uljin and Pohang in Eastern Korea between July 2010 and May 2011. Two sets of 13 different nets were used, including 5 panels of gillnets and trammel nets each with stretched mesh sizes of 7.6, 9.1, 10.6, 12.1, and 13.6 cm and 3 panels of gillnets with a mesh size of 9.1 cm with supporting lines with different line spacing. The outer (stretched) mesh size of the trammel nets measured 51.5 cm. The target fishes of the fishing nets were various types of flounders. The catch rate of flounders was 50.7% of the total catch in weight. The total catch for all nets was 443.8 kg. The predominant species was pointhead flounder (Cleisthenes pinetorum). The total catch by trammel nets was 1.4 times that of the comparable gillnets. But more pointhead flounder were caught by gillnets than by trammel nets, though there was no significant difference. Fishermen catching the pointhead flounder in Korea said that there was no need to use trammel net to catch it; this was an unexpected finding compared to the findings of other flounder fisheries. The amounts of roughscale sole, brown sole, and blackfin flounder caught by trammel nets were greater than those caught by gillnets. The mean lengths (standard deviation) of blackfin flounder, pointhead flounder, brown sole, and roughscale sole were 21.0 (4.57), 22.9 (3.40), 24.7 (4.90), and 28.3 (5.43) cm, respectively; there were significant differences in mean length (p < 0.00001). Therefore, in order to catch flounder efficiently, the fishing nets and mesh size should be chosen according to the target species. One advantage of using supporting lines is that it prevents breakage by strengthening the material especially when utilized on a rough bottom. Catch by using gillnet with supporting lines was not greater than that by using trammel net for the conservation of fisheries resources.