어류 가두리에 적용하기 위한 황동 직조 어망의 성능 평가 = Evaluation of brass weaving fishing nets for aquaculture cage applications

국문 초록 (Abstract)

해상가두리 양식에 사용되는 어망은 대부분 PA, PE 등 합성 섬유로 제작된다. 따라서 부착생물에 의해 가두리의 하중이 증가되거나 조류의 원활한 흐름을 방해하여 용존 산소가 감소하는 등 어류를 양식하기 위한 가두리 내부 용적을 확보하는데 어려움이 발생된다. 이를 해결하기 위한 방법 중 하나로 기존의 합성 섬유 재질의 가두리 그물을 황동 재질의 그물로 대체하는 연구가 진행되었고, 친환경성 강화, 생산성 향상, 양식장 관리의 편리성 등 그 효과가 일부 입증되었다. 하지만 황동 재질 어망의 직조 기술 및 성능에 대해서는 보다 면밀한 검토가 요구되기에, 본 연구에서는 황동 어망을 직조하기 위한 다양한 방법 중 어류 가두리에 적용하기 위한 최적의 황동 어망 직조 기술을 평가하였다. 또한 황동 직조 어망의 중량, 인장하중, 신장률, 피로도 및 내마모성 등 성능을 파악하여 황동 어망 가두리의 실용화를 위한 기초 자료를 제시하였다. 연구 결과, 어류 가두리에 적용하기 위한 황동 어망을 체인링크 방법으로 직조한다면 내구성이나 설치의 편의성을 확보할 수 있으며, 두루마리 형태로 포장까지 가능하기에 보관에도 용이할 것이다. 또한 피로도와 마모율에 있어서도 장점을 가지고 있기에 기존 섬유 어망에 비해 단위면적당 무게가 크고 경제성이 떨어진다는 단점을 보완하기 위해 적절한 직경과 그물코 발의 길이를 선택한다면 활용성을 높일 수 있을 것으로 기대된다.

다국어 초록 (Multilingual Abstract)

Most fishing nets used in fish cage aquaculture are made of synthetic fibers such as polyamide (PA) and polyethylene (PE). Therefore, it is challenging to maintain the internal volume of the fish cage due to biofouling, which can increase the load on the cage or reduce dissolved oxygen levels by impeding smooth current flow. To address this issue, research has been conducted to replace conventional synthetic fiber cage nets with brass nets, demonstrating certain benefits such as improved productivity and ease of fish cage management. However, given the need for a more thorough examination of brass fishing net weaving technology and performance, this study assessed the optimal weaving method for brass fishing nets to be used in fish cages. Additionally, it provided essential data for the practical application of brass fishing nets by evaluating their weight, tensile strength, elongation, fatigue resistance, and wear resistance. The study concluded that weaving brass fishing nets using the chain link method ensures durability, ease of installation, and compact storage in a scroll-like form. Moreover, due to their superior fatigue and wear resistance properties, brass nets can offer increased utility if appropriate net diameter and length are selected to compensate for their higher weight per unit area and relatively higher cost compared to existing fiber fishing nets.

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