The catching of hairy clams (Anadara antiquata) is carried out in shallow, muddy waters. Fishermen often catch these clams without limiting their size, which has an impact on population decline due to overfishing. This study aims to analyze the effectiveness of fisheries extension on the adoption rate of environmentally friendly fishing gear, specifically the comparison of the use of rec, garit, and seser gear. The study was conducted from January to March 2026, in Banjarkemuning Village and Gisikcemandi Village. The total population of fishermen was 244 people with 188 research respondents consisting of 37 rec users, 64 garit users, and 81 seser users. The research method used a quantitative descriptive-comparative approach through field surveys, extension activities, pre-tests, post-tests, observations, and interviews. Data were analyzed using Normalized Gain (N-Gain), One Way ANOVA tests, and multiple linear regression. The results showed that fisheries extension effectively increased fishermen's knowledge with an average pre-test score of 54.26 increasing to 81.74 in the post-test, with an N-Gain value of 0.60 (moderate category). The adoption rate of environmentally friendly fishing gear after extension reached 67.86%, with details of seser users at 82.00%, garit 62.03%, and rek 46.67%. The results of the ANOVA test showed a significant difference in the effectiveness of extension between fishing gear groups (p<0.05). Regression analysis showed that education level, fishing experience, increased post-test scores, and perceived economic benefits significantly influenced the adoption rate, with increased knowledge as the dominant factor. Fisheries extension has been proven effective in increasing the adoption of environmentally friendly fishing gear in hairy clam fishing. Extension strategies based on fishermen's characteristics and economic benefits need to be developed to accelerate the adoption of sustainable fishing technology.
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