• 수산해양기술연구
• /
• 제48권4호
• /
• pp.387-400
• /
• 2012

Species composition and seasonal variation of aquatic organism in the coastal waters off Taean, Korea were investigated using catches by commercial fishing of the pot and gill net from April 2010 to January 2011. A total of 58 species, 10,602 individuals and 547,569g of aquatic organism were collected during the study. Aquatic organism were composed of 22 species of Pisces, 20 species of Crustacea, 8 species of Gastropoda, 3 species of Echinodea, 2 species of Cephalopoda and Bivalvia, and 1 species of Holothuroidea. 41 species in 9 orders and 22 families were collected by the pot, and 28 species in 15 orders and 22 families were collected by the gill net. Volutharpa ampullacea was the most dominant in the pot, while Okamejei kenojei was the most dominant in the gill net. These two species accounted for 73.9% in the number of individuals, and 64.4% in biomass. The number of species was high in spring in the pot, and autumn in the gill net. The number of individuals and biomass were highest in winter and summer respectively in the pot, and summer in the gill net. The number of species of the consignment quantity caught by commercial fishery of the pot and gill net in Mohang was 12 and 14 respectively. Cluster analysis based on species composition of the 18 most common species showed that the species were separated into 3 different group. Group A was composed of species which were abundant in spring, group B was composed of species which were abundant in summer and autumn, and group C was composed of year-round residents.

• 수산해양기술연구
• /
• 제46권3호
• /
• pp.204-213
• /
• 2010

Test fishing was carried out using six kinds of different mesh sizes (20, 22, 24, 28, 35, 40mm) for springnet-pot to study bycatches according to the mesh size and catches survey was done for another one (mesh size : 22mm, entrance round : 350mm) in Geo-je & Tong-young waters of Korea. On the first sea experiment, it was thought that suitable mesh size of spring-net-pot catching conger-eel over 35cm with decreasing the catches of conger-eel (Conger myriaster) below 35cm was 24mm. On the second sea experiment, commercial catches were crabs (Charybdis bimaculata), octopus minor (Octopus variabilis) and others including conger-eel, and catches proportion was 60% of total catches weights. There was no big difference for the monthly catches. Self-consumption catches were 9 species including conger-eel below 35cm holding 50% of catches in the side of weights. There were 40% of bycatches for the catches weights and 63% for catches numbers in the 22mm mesh size of spring-net-pot having entrance round over 140mm. It showed that 50% of catches weights were discarded.

• 수산해양기술연구
• /
• 제49권3호
• /
• pp.200-207
• /
• 2013

This paper presents the mesh selectivity of a net pot for common octopus Octopus minor for the sustainable resources management of common octopus. The filed experiments were carried out the total 10 times in the southern part of coastal sea in Korea from March to May in 2010 using net pots of five different mesh sizes (16, 18, 20, 22 and 26mm). The test of size selectivity, indicated a 50% selection value on the logistic master curve of 3.195, whereby 50% of individuals with a mantle size of approximately 70.3mm selected a mesh size of 22mm. Considering that 50% of common octopus entering sexual maturity have a mantle size of 70.6mm, the optimum mesh size should be equal to, or larger than 22mm.

• 한국어류학회지
• /
• 제35권4호
• /
• pp.313-324
• /
• 2023

2018년 태안 연안에서 계절별로 통발과 삼중자망으로 수산생물의 종조성과 계절변동을 조사하였다. 두 종류의 어구에서 총 78종, 4,501개체, 373,474.0 g으로 둥근성게가 우점하였다. 통발에서는 52종, 3,059개체, 81,546.8 g으로 갑각류가 가장 많았고, 둥근성게 다음으로 그라비새우가 우점하였다. 삼중자망에서는 57종, 1,442개체, 291,926.9 g으로 어류가 가장 많았으며, 그중 홍어가 가장 높게 나타났다. 군집분석 결과, 2개의 뚜렷한 그룹으로 구분되었는데 해양환경 변화에 따라 수산생물의 종 구성이 달라지는 것으로 나타났다.

• 수산해양기술연구
• /
• 제42권1호
• /
• pp.1-10
• /
• 2006

Present study was conducted to improve the spring frame net trap for conger eel, Conger myriaster which prevents by-catch and protects immature fish. A series of comparative fishing experiment was carried out in water off the south-east coast of Korea from Nov. 2004 to Jul. 2005. And analyzed the amount of catch, by-catch rate, and CPUE, etc. of experimental traps which were the spring frame net traps, sorted four types of flappers. And the compared gear was a plastic conger eel pot. The conclusions were as follows. By-catch rates of spring frame net trap with the compressed flapper bound by nylon mono-filament was about 0-3%. CPUE of spring frame net trap with the compressed flapper was about 50-60% lower than that of traditional and plastic pot. And in case of conger eel that the total length is over 350mm, CPUE was little different on each type of flapper of every mesh size.

• 수산해양기술연구
• /
• 제52권1호
• /
• pp.9-16
• /
• 2016

This study was conducted to analyze fishing capacity and bycatch by mesh size and entrance size of spring net pot conducted by water tank and field experiment. The water tank experiments were conducted by using traps with mesh size of 22 mm and entrance size of 120 mm and 140 mm, respectively in the water tank of NIFS. The field experiment was conducted using 5 kinds of spring net pot with mesh sizes of 20 mm, 22 mm, 35 mm and entrance size of 120 mm, 130 mm, 140 mm, 360 mm by coastal trap fishery vessel operating around the area of Geoje island. In the result of water tank experiments, the catch of conger eel was 1.5 times higher when using trap with entrance size of 140 mm than that of 120 mm. In the field experiment, when using same mesh size, the larger the entrance size, the higher amount of conger eel catch, bycatch and number of bycatch species. When using the same entrance size, the larger the mesh size, the lower amount of conger eel catch and number of bycatch species, whereas the amount of bycatch showed increasing trend.

• 수산해양기술연구
• /
• 제58권2호
• /
• pp.95-105
• /
• 2022

In this study, the fishery status of the octopus pot fishery in the east coastal sea were investigated, and the fishing performance of each pot shape was compared and analyzed. The fishery status survey was conducted through listening surveys at Jukbyeon Port, Uljin Port and Pohang Daebo Port in Gyeongbuk Province, and the amount of fishing gear used, fishing method, size and loss of octopus pot fishery was investigated. On the east coastal sea, octopus is one of the commercially important fish stocks and is caught in inshore pots, inshore combos, inshore gillnets and offshore pots. Among these fishing methods, pot fishing yields the highest catch. The shape of the pot differs depending on the region. In Uljin (Jukbyeon Port and Hupo Port), Gyeongbuk, rectangular type net pots are mainly used, and in Pohang (Daebo Port) in Gyeongbuk, drum-type pots are mostly used. Enteroctopus dofleini accounts for more than 90% of the catch of octopus. For the octopus fishing performance test by trap type, three types of traps (rectangular pot, drum pot and cylinder pot) were used on the coastal sea of Pohang Daebo. As a result, the total catch by pot shape was shown in the order of rectangular-type pot > drum-type pot > cylinder-type pot. The catch of octopus, the target species, was in the following order: rectangular-type pot > drum-type pot > cylinder-type pot. Such result shows a significant difference (Mann-Whitney test, p<0.05).

• 수산해양기술연구
• /
• 제13권2호
• /
• pp.1-4
• /
• 1977

원뿔대 모양의 은대구 통발을 권양할 때의 류휴저항을 측정하고, 그로부터 모랫줄의 굵기,권양의 소요 순마력등을 추산하는 식을 유도했다. 1.통발의 권양속도 v(m/sec)와 류휴저항(수중중량 포함)T(kg)사이에는 대체로 다음과 같은 관계가 성립한다. (a)빈통발을 직립으로 권양할 때: T=$48v^{1\cdot0}$ $45^\circ$ 경사지게 권양할 때: T=$50v^{1\cdot1}$ (단 $0.3\leqq v \leqq1.3$) 이고,이들 사이에 유의차는 없다. (b)밑면에 천을 깐 통발을 직립으로 권양할 때: T=$120^{1\cdot1}$ $45^\circ$ 경사지게 권양할 때: T=98v$^{1=cdot1}$ (단 $0.3\leqq v \leqq0.8$) 2.통발의 유류저항의 최대치를 T=$120v^{1\cdot1}$ (단 $0.3\leqq v \leqq0.8$)이라 보고, 모릿줄로써 P.P.3년 로우프를 쓴다면 d(mm)는 대략 $d=72\frac{D}{H}v^{1\cdot1}$ 을 만족시켜야 한다. 3.권양의 순마력 P(ps)는 $P=\frac{75}{120}\frac{D}{H}v^{2\cdot1}$ 이상일 것이 요구된다.

• 수산해양기술연구
• /
• 제32권1호
• /
• pp.33-41
• /
• 1996

In order to obtain the most favourable classification system for fishing gears, the problems in the existing systems were investigated and a new system in which the fishing method was adopted as the criterion of classification and the kinds of fishing gears were obtained by exchanging the word method into gear in the fishing methods classified newly for eliminating the problems was established. The new system to which the actual gears are arranged is as follows ; (1)Harvesting gear \circled1Plucking gears : Clamp, Tong, Wrench, etc. \circled2Sweeping gears : Push net, Coral sweep net, etc. \circled3Dredging gears : Hand dredge net, Boat dredge net, etc. (2)Sticking gears \circled1Shot sticking gears : Spear, Sharp plummet, Harpoon, etc. \circled2Pulled sticking gears : Gaff, Comb, Rake, Hook harrow, Jerking hook, etc. \circled3Left sticking gears : Rip - hook set line. (3)Angling gears \circled1Jerky angling gears (a)Single - jerky angling gears : Hand line, Pole line, etc. (b)Multiple - jerky angling gears : squid hook. \circled2Idly angling gears (a)Set angling gears : Set long line. (b)Drifted angling gears : Drift long line, Drift vertical line, etc. \circled3Dragged angling gears : Troll line. (4)Shelter gears : Eel tube, Webfoot - octopus pot, Octopus pot, etc. (5)Attracting gears : Fishing basket. (6)Cutoff gears : Wall, Screen net, Window net, etc. (7)Guiding gears \circled1Horizontally guiding gears : Triangular set net, Elliptic set net, Rectangular set net, Fish weir, etc. \circled2Vertically guiding gears : Pound net. \circled3Deeply guiding gears : Funnel net. (8)Receiving gears \circled1Jumping - fish receiving gears : Fish - receiving scoop net, Fish - receiving raft, etc. \circled2Drifting - fish receiving gears (a)Set drifting - fish receiving gears : Bamboo screen, Pillar stow net, Long stow net, etc. (b)Movable drifting - fish receiving gears : Stow net. (9)Bagging gears \circled1Drag - bagging gears (a)Bottom - drag bagging gears : Bottom otter trawl, Bottom beam trawl, Bottom pair trawl, etc. (b)Midwater - drag gagging gears : Midwater otter trawl, Midwater pair trawl, etc. (c)Surface - drag gagging gears : Anchovy drag net. \circled2Seine - bagging gears (a)Beach - seine bagging gears : Skimming scoop net, Beach seine, etc. (b)Boat - seine bagging gears : Boat seine, Danish seine, etc. \circled3Drive - bagging gears : Drive - in dustpan net, Inner drive - in net, etc. (10)Surrounding gears \circled1Incomplete surrounding gears : Lampara net, Ring net, etc. \circled2Complete surrounding gears : Purse seine, Round haul net, etc. (11)Covering gears \circled1Drop - type covering gears : Wooden cover, Lantern net, etc. \circled2Spread - type covering gears : Cast net. (12)Lifting gears \circled1Wait - lifting gears : Scoop net, Scrape net, etc. \circled2Gatherable lifting gears : Saury lift net, Anchovy lift net, etc. (13)Adherent gears \circled1Gilling gears (a)Set gilling gears : Bottom gill net, Floating gill net. (b)Drifted gilling gears : Drift gill net. (c)Encircled gilling gears : Encircled gill net. (d)Seine - gilling gears : Seining gill net. (e)Dragged gilling gears : Dragged gill net. \circled2Tangling gears (a)Set tangling gears : Double trammel net, Triple trammel net, etc. (b)Encircled tangling gears : Encircled tangle net. (c)Dragged tangling gears : Dragged tangle net. \circled3Restrainting gears (a)Drifted restrainting gears : Pocket net(Gen - type net). (b)Dragged restrainting gears : Dragged pocket net. (14)Sucking gears : Fish pumps.

• 한국패류학회지
• /
• 제24권2호
• /
• pp.131-136
• /
• 2008

피조개 부착치패의 중간양성시 생존율을 향상시키기 위하여 보호망의 형태 및 유실 방지망의 종류에 따른 부착치패의 성장 및 생존을 조사하였다. 보호망의 형태별로 60일간 중간양성한 부착치패의 성장은 노출형이 평균 각장 $12.8{\pm}3.2$ mm로 가장 빨랐으며(P<0.05), 통발형이 $12.2{\pm}3.5$ mm, 원통형이 $11.9{\pm}3.8$ mm, 직사각형이 $10.9{\pm}3.7$ mm순으로 큰 차이를 나타내지 않았다. 생존율은 통발형이 43.7%, 원통형이 41.2%, 직사각형이 31.6%로 보호망의 형태에 따라 통발형 및 원통형이 직사각형보다 높았으며, 노출형이 5.4%로 매우 낮았다(P<0.05). 유실 방지망 종류별로 163일간 중간양성한 부착치패의 성장은 차광막이 평균 각장 $13.9{\pm}3.1$ mm로 가장 빨랐고(P<0.05), 여자망이 $12.9{\pm}3.0$ mm, PE망이 $11.8{\pm}3.1$ mm 및 대조구가 $12.6{\pm}3.3$ mm 순으로 나타났으며, 생존율은 차광막이 91.5%, PB망이 90.1%, 여자망이 88.5%로 유의한 차이가 없었다. 그러나 유실 방지망을 설치하지 않은 대조구에서는 61.5%로 설치한 시험구보다 유의하게 낮았다(P<0.05). 피조개 부착치패의 중간양성시 보호망은 통발형 및 원통형을 사용하면 채묘망과 보호망 간의 공간이 확보되어 마찰에 의한 탈락을 방지하고, 해수의 소통이 원활하여 높은 생존율을 기대할 수 있을 것으로 판단된다. 그리고 보호망목의 크기는 2 mm 내외를 사용하여 해수의 유통이 비교적 원활히 되도록 하였으며, 일시적으로 탈락하는 개체의 유실을 방지하기 위하여 부착치패 채묘망과 직각으로 설치한 결과 높은 생존율을 보였다. 유실 방지망 종류별 중간양성시험 결과는 시험기간이 겨울철이여서 태풍 등의 영향을 전혀 받지 않았고, 보호망에 부착물질이 거의 없어 생존율이 매우 높았다. 겨울철 중간양성이 여름철 중간양성 보다 생존율에서는 월등히 높은 결과를 나타내어 산업화를 위해서는 유리할 것으로 추정되었다. 따라서 피조개 부착치패 중간양성 시기는 태풍 등의 위험한 시기를 피하여 조절하고, 피조개 부착치패의 중간양성시 통발형 및 원통형의 보호망과 유실 방지망을 병행하여 사용하면 높은 생존율을 기대할 수 있을 것으로 판단되었다.