Gillnets made of the biodegradable resin polybutylene succinate co-adipate-co-terephthalate (PBSAT) were tested under commercial fishing conditions to compare their fishing performance with that of conventional nylon polyamide (PA) gillnets. Both types of gillnets were made of 0.55 mm Ø monofilaments. However, since the biodegradable nets are weaker than nylon PA nets when using the same monofilament diameter, we also used biodegradable nets made of 0.60 mm Ø monofilament that had a similar tensile strength to the 0.55 mm Ø nylon PA nets. The relative catch efficiency of the different gillnet types was evaluated over the 2018 autumn fishing season for saithe and cod in northern Norway. For cod, both biodegradable gillnets (0.55 and 0.60 mm) had a significantly lower catch efficiency compared to the traditional nylon PA net (0.55 mm) with estimated catch efficiencies of 62.38% (CI: 50.55–74.04) and 54.96% (CI: 35.42–73.52) compared with the nylon PA net, respectively. Similarly for saithe, both biodegradable gillnets (0.55 and 0.60 mm) had a lower estimated catch efficiency compared to the traditional nylon PA net (0.55 mm) with estimated catch efficiencies of 83.40% (71.34–94.86) and 83.87% (66.36–104.92), compared with the nylon PA net, respectively. Tensile strength does not explain the differences in catch efficiency between the two gillnet types, since increasing the twine diameter of the biodegradable gillnets (to match the strength of nylon PA gillnets) did not yield similar catch efficiencies. However, the elasticity and stiffness of the materials may be responsible for the differences in catch efficiency between the nylon PA and biodegradable gillnets.

中文翻译：

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单丝麻线的机械性能对可生物降解刺网捕捞效率的影响。

在商业捕鱼条件下测试了由可生物降解的树脂聚丁二酸丁二酯-己二酸酯/对苯二甲酸对苯二甲酸酯（PBSAT）制成的刺网，以将其捕捞性能与常规尼龙聚酰胺（PA）刺网进行比较。两种刺网均由0.55 mm直径的单丝制成。但是，由于当使用相同的单丝直径时，可生物降解的网比尼龙PA的网弱，因此我们也使用由0.60 mm直径的单丝制成的可生物降解的网，其抗张强度与0.55 mm直径的尼龙PA的网相似。在挪威北部的赛德和鳕鱼的2018年秋季捕捞季节中，评估了不同刺网类型的相对捕捞效率。对于鳕鱼，两种可生物降解的刺网（0.55和0.60 mm）与传统的尼龙PA网（0。55毫米），与尼龙PA网相比，捕捞效率分别为62.38％（CI：50.55–74.04）和54.96％（CI：35.42–73.52）。同样，对于赛斯而言，两种可生物降解的刺网（0.55和0.60 mm）的估计捕捞效率均低于传统的尼龙PA网（0.55 mm），估计捕捞效率分别为83.40％（71.34-94.86）和83.87％（66.36-104.92）。 ，分别与尼龙PA网相比。拉伸强度不能解释两种刺网类型之间捕捞效率的差异，因为增加可生物降解刺网的麻线直径（以匹配尼龙PA刺网的强度）不会产生相似的捕捞效率。但是，材料的弹性和刚度可能是尼龙PA和可生物降解刺网之间捕捞效率差异的原因。