간행물
수산해양기술연구 KCI 등재 Journal of the Korean Society of Fisheries and Ocean Technology 韓國漁業技術學會誌
- 발행기관 한국수산해양기술학회(구 한국어업기술학회)
- 자료유형 학술지
- 간기 계간
- ISSN 2671-9940 (Print)2671-9924 (Online)
- 수록기간 1965 ~ 2025
- 주제분류 농수해양 > 수산학 농수해양 분류의 다른 간행물
- 십진분류KDC 529DDC 639
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61권 4호 (2025년 11월) 11건
1.
2025.11
구독 인증기관 무료, 개인회원 유료
A study on the mesh size selectivity of cylindrical net pot for a swimming crab (Charybdis japonica)
This study analyzed the selectivity of cylindrical net pot for the swimming crab (Charybdis japonica) using the SELECT model with a normal function. Data were obtained from four sea trials employing six mesh sizes (20.2, 27.6, 33.7, 37.9, 50.5, and 65.0 mm). The carapace length corresponding to the maximum catch in each mesh size ranged from 32.6 to 36.7 mm, whereas larger meshes of 50.5 mm and 65.0 mm exhibited peaks at 50.3 - 52.3 mm. This result clearly demonstrated that the size composition of the catch varied with increasing mesh size. The 50% retention carapace length (L50) ranged from 25.2 to 47.8 mm. When comparing fishing performance, smaller mesh pots generally yielded higher catches relative to the 20.2 mm reference pot. A comparison between the legal mesh size of 33.7 mm (nominal 35 mm) and the adjacent 37.9 mm mesh revealed that a 4 mm increase in mesh size significantly raised the proportion of crabs larger than 38 mm carapace length. Based on the minimum size at first maturity (28.86 mm), the optimal mesh size of the pot was estimated to be 35.59 mm. However, more precise sea trials and analyses are required to obtain reliable results. The findings also indicate that changes in mesh size have a clear influence on the size composition of swimming crab catches, suggesting that the correlation between mesh size and catch characteristics must be carefully considered to ensure sustainable resource management.
4,000원
2.
2025.11
구독 인증기관 무료, 개인회원 유료
Purse seine fishing is a fishing method that involves surrounding a school of fish with a net and then closing the net at the bottom to prevent the fish from escaping. The success rate of purse seine operations is universally determined by the trajectory of the net shooting whether in large-scale, offshore, or coastal purse seine operations. The decision on where to shoot the nets and the movement of the surrounding vessels depends on the captain's or fishing master's judgment that is based on experience. Real purse seine operations must consider wind direction, currents, wave height, and the distribution of prey and other marine life making it challenging to cast a perfect circle or oval-shaped net, often relying on various shooting trajectories based on experience. Current purse seine operations involve both the main vessel and auxiliary boats, and the shooting trajectory is determined by various environmental factors like wind direction and sea conditions making it challenging to achieve a perfect cast. This comprehensive overview of the purse seine fishing industry and its practices in South Korea provides insights into the operational techniques and challenges faced by fishermen as well as the significant role of research in enhancing fishing operations and sustainability.
4,200원
3.
2025.11
구독 인증기관 무료, 개인회원 유료
This study compared the physical properties and catch performance of gillnets made from biodegradable PBEAS (butylene succinate-co-adipate/terephthalate-co-ethylene succinate) resin with those of conventional PA (polyamide) gillnets in coastal gillnet fisheries targeting Pampus argenteus. Mechanical tests showed that PBEAS nets showed tensile strength and elongation similar to PA nets. In field trials, the total catch weight of PBEAS nets (596.6 kg, 261 individuals) was slightly higher than that of PA nets (535.1 kg, 248 individuals). The catch of Pampus argenteus was also greater in PBEAS nets with increases of approximately 51.0% in number and 35.8% in weight although the difference in total catch weight between the two net types was not statistically significant (Wilcoxon signed-rank test, p = 0.25). The size distribution of Pampus argenteus ranged from 12 to 28 cm fork length (FL) for both nets, with PBEAS nets showing more individuals particularly in the 16 – 20 cm range. Bycatch patterns were similar between the two gears where Chelidonichthys kumu, white Argyrosomus argentatus, and Zeus faber identified as dominant species. These findings clearly demonstrate the practical potential of PBEAS biodegradable gillnets and highlight their promise as an alternative to PA nets for promoting sustainable fisheries.
4,000원
4.
2025.11
구독 인증기관 무료, 개인회원 유료
This study quantitatively analyzed the target strength (TS) characteristics of the dotted gizzard shad (Konosirus punctatus) across various fork lengths (FL) and frequency conditions. In July 2023, TS measurements were conducted on six size groups (FL: 14.4–23.5 cm) under free-swimming conditions in a seawater acoustic tank at the Fisheries Resources Research Center in Tongyeong, Korea. A scientific echosounder (EK80, SIMRAD) was used to collect TS data at three frequencies: 38, 70, and 120 kHz. The results showed that TS values increased with fork length, and the 120 kHz frequency exhibited the widest distribution range and distinct bi- or multi-modal patterns. The TS–FL relationships for each frequency were as follows: TS38 kHz = 20·log(FL) ‒ 68.41, TS70 kHz = 20·log(FL) ‒ 70.76, and TS120 kHz = 20·log(FL) ‒ 70.90. Unlike traditional tethered measurement methods, this study obtained TS data under free-swimming conditions, providing values more representative of real-world acoustic survey environments. The findings are expected to serve as foundational data for improving the accuracy of monitoring the distribution and biomass estimation of K. punctatus using hydroacoustic methods.
4,000원
5.
2025.11
구독 인증기관 무료, 개인회원 유료
The purpose of this study is to identify the flow resistance characteristics of the trawl net according to the towing speed of the vessel using two trawl nets designed and manufactured based on 2,000 HP. The trawl net consists of wings, bag and cod-end part, two types with wall area of 747 m 2 (Sae Dong Baek) and 1,262 m 2 (Dong Baek) with differences in the size of the trawl net. The result of sea experiments are as follows: the flow resistance of trawl net at the flow velocity = 1 m/s or higher is affected by the difference in the composition of the cod-end rather than the wing or bag part of the Sae Dong Baek´s trawl net, Dong Baek´s the cod-end part has a ratio value of 1.19, compared to Sae Dong Baek´s trawl net with a size of 120 m, and Dong Baek´s trawl net is small at 60 mm. Therefore, the water entering into the net cannot easily pass, which is considered to be a factor that increases resistance at the cod-end part. In the result of the experiment, it was found that decreases exponentially when increases which makes . The constant values when = 1 m/s were 6.72 and 3.75, and values were 1.14 and 0.94, showing a difference between the two nets as the flow velocity increased. The height at the mouth of bottom trawl net decreases exponentially as the current velocity increases; such height given by where the constant and values are 0.85 for the increase in the flow velocity and the value when =1 m/s is 4.35. Therefore, this study investigated the flow resistance characteristics of trawl net at sea. It was possible to obtain more reliable information than previous studies by using a real fishing vessel with advanced underwater measurement devices. As a result, it was possible to analyze the underwater shape change of trawl net and the resulting flow resistance characteristics more quantitatively.
4,000원
6.
2025.11
구독 인증기관 무료, 개인회원 유료
This study investigates the effects of marine biofouling on the propulsion performance of a 2.99-ton HDPE (High-Density Polyethylene) coastal fishing vessel through full-scale sea trials. Four operating conditions, clean hull, fouled hull, partially cleaned hull, and completely cleaned hull, were tested to analyze changes in ship speed and engine revolutions. The maximum speed decreased from 32.2 kn in the clean condition to 18.7 kn under fouling, corresponding to a 42% reduction in performance, and recovered to 29.0 kn (about 90% of the original speed) after complete cleaning. Additionally, immersion tests of HDPE, FRP, and aluminum panels showed that all materials experienced severe fouling during spring and summer; however, HDPE surfaces exhibited lower adhesion strength and easier removal of organisms. These findings confirm that hull cleanliness has a significant influence on the propulsion efficiency of small vessels and highlight the necessity of proactive cleaning to maintain HDPE vessel performance. Future research will include comparative evaluations with FRP and aluminum vessels to assess the substitution potential of HDPE hulls and provide technical evidence for the wider adoption of eco-friendly fishing vessels.
4,000원
7.
2025.11
구독 인증기관 무료, 개인회원 유료
This study was conducted to improve the stability of small barges used for remote bird monitoring at Capsosiphon fulvescens aquaculture farms. The monitoring accuracy is compromised by rolling and pitching motions induced by waves and wind. To address this problem, a damping system was developed to enhance barge stability. Field experiments were conducted at a farm to evaluate the effectiveness of the developed damping system. The rotational motions of the barge, with and without the damping system, were measured using a six-axis gyroscope sensor. The measurements were conducted at the Capsosiphon fulvescens farm located in Cheokchan-ri and Deokdong-ri, Gogeum-myeon, Wando-gun, Jeollanam-do across two periods: from October 5, 2024 to December 17, 2024 (Damping without) and from February 19, 2025 to April 15, 2025 (Damping with). The collected data were validated against wind speed records from the Korea Meteorological Administration. The results demonstrated that the damping system effectively reduced barge motion. Within a wind speed range of 0.1-9.0 m/s, the system achieved an average reduction of 7.11% in rotational motions. Its maximum performance was recorded at approximately 7.0 m/s wind speed where it achieved a reduction of 23.35%. These findings confirm the system significantly enhances barge stability and improves monitoring reliability.
4,000원
8.
2025.11
구독 인증기관 무료, 개인회원 유료
This study aims to establish a data-driven framework for identifying fishing vessel risk factors based on the Korean Maritime Accident Verdicts. As fishing vessels accounted for 64.66% of maritime accidents and 77.45% of fatalities in Korea (2020 – 2024), they represent a key target for maritime safety management. The narrative structure of verdicts — covering background, cause, and consequence — was transformed into 4M (Man, Machine, Method, Media)-based causal data, and the contribution ratios of each factor were calculated by an accident type. To complement documentary analysis, a HAZID (Hazard Identification) workshop was conducted to verify findings through field assessment. The proposed analytical framework converts narrative verdict records into numerical contribution values and reproducible causal sequences, enabling quantitative comparison of accident mechanisms across accident categories. This allows the identification of which causal factors and combinations should be prioritized for prevention efforts in fishing vessels, providing an objective basis for determining safety-check items and risk-control priorities. By integrating quantitative data analysis with field-based validation, this study establishes a practical and data-driven foundation for risk assessment in fishing-vessel design and safety management.
6,300원
9.
2025.11
구독 인증기관 무료, 개인회원 유료
In 2015, the safety refresher training system for seafarers was reformed with the aim of strengthening practical skills. However, a failure to forecast demand led to a chronic backlog of trainees. Furthermore, the uniform application of merchant vessel standards (STCW) to fishing vessels (STCW-F) created a qualitative problem, undermining the effectiveness of the education. This study aims to diagnose these issues and propose effective improvement measures. This research employed a mixed-methods approach. First, a comparative analysis was conducted between international conventions (STCW and STCW-F) and domestic regulations, institutional standards, and curricula. Second, an empirical analysis was performed through a survey of 220 merchant and fishing vessel seafarers, which was supplemented by in-depth interviews. The analysis revealed several critical gaps. The domestic legal framework does not distinguish between STCW and STCW-F and the curriculum is heavily biased toward theory, failing to meet international practice-oriented competency standards. The survey and interview results confirmed that the current fits all training is severely misaligned with the operational realities of fishing vessels, which have different equipment and environments. Based on these findings, this study proposes three prolonged improvement plans. First, the curriculum should be dualized to reflect the distinct characteristics of merchant and fishing vessels. Second, a hybrid training model that combines mandatory shore-based training for high-risk drills with flexible onboard training for basic skills should be introduced. Third, facility standards for training institutions should be converted from rigid mandates to flexible guidelines. These measures are expected to resolve the chronic training backlog and enhance the practical emergency response capabilities of all seafarers.
4,000원
10.
2025.11
구독 인증기관 무료, 개인회원 유료
This study empirically analyzed the factors contributing to the profitability decline of large purse-seine fishery enterprises in Korea. The main findings are as follows. First, both the rate of change in fleet-average catch and the rate of change in fish prices had a statistically significant positive effect on the rate of change in fishing revenue. In addition, the rate of change in fishing revenue significantly affected profit rate whereas the rate of change in fishing costs did not show statistical significance. These results suggest that enhancing fleet-average catch, rather than reducing costs, may be a more effective strategy for improving the profitability of large purse-seine fisheries. Seond, factors related to fishing effort and labor productivity were not statistically significant in explaining variations in total catch. Likewise, the implementation of the mackerel Total Allowable Catch (TAC) system in 1999 and the reduction of fishing areas within Japan’s EEZ following the breakdown of Korea – Japan fisheries negotiations in 2016 did not have significant effects on catch levels. In contrast, a reduction in the number of fleets due to the fishing fleet buyback program had a significant positive effect on catch volume. This implies that it can lead to long-term structural improvements by increasing average catch per fleet through fleet downsizing although he fishing fleet buyback program, may temporarily reduce total catch. Third, chub mackerel landing volume had a significant negative effect whereas import volume had a significant positive effect on landing prices. This unexpected result may be attributed to consumer preferences for specific fish sizes, quality-based market segmentation, or supply-demand imbalances across domestic and international distribution channels. Further research is therefore required to clarify these structural dynamics.
4,300원
11.
2025.11
구독 인증기관 무료, 개인회원 유료
Marine debris has become a serious global environmental and economic concern with abandoned fishing gear identified as one of the primary drivers threatening marine ecosystems. In South Korea, a substantial amount of fishing gear continues to enter the ocean annually; however, the current land-based disposal system faces inherent limitations including high transportation costs and low recycling efficiency. To address these challenges, this study evaluated the feasibility of repurposing decommissioned fishing vessels as marine pre-treatment platforms to collect and process abandoned fishing gear at sea. Results indicate that marine pre-treatment vessels can reduce the volume of discarded fishing gear, thereby cutting transport and disposal costs. Refitting decommissioned vessels is more cost-effective than new construction and increases their recycling value. This research provides a policy and technical foundation to improve the marine debris management system by assessing the economic and environmental benefits of deploying marine pre-treatment vessels.
4,000원
