Kemiringan dinding perangkap Jodang (Slope of Jodang Trap Wall)
Abstract
This research tried to test 3 slopes of jodang trap wall which were usually used by Palabuhanratu fishermen. The objective was to obtain slope of trap wall that selective to babylon snails size. The wall could be passed only by snails with shell length of p ³ 4.27 cm. In this research, 9 traps with slope of 30, 40 and 50o were operated in Palabuhanratu waters. Fishing operations were done 10 times with 3 hours soaking time for each fishing operation. Result showed that slope of jodang trap wall of 50o was more selective than the other two jodang traps. It caught 29.11% of snails with shell length of p ³ 4.27 cm. While, slope of a =40 and a =30o were 19.42% and 10.41% of total catch of babylon snails.
Key words: Slope and jodang trap wall
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Penelitian ini mencoba menguji 3 kemiringan dinding perangkap jodang yang biasa digunakan oleh nelayan Palabuhanratu. Tujuannya untuk mendapatkan sudut kemiringan dinding perangkap yang selektif terhadap ukuran keong macan. Dinding perangkap hanya dapat dilalui oleh keong dengan panjang cangkang p ³ 4,27 cm. Dalam penelitian ini, 9 perangkap dengan sudut kemiringan a = 30, 40 dan 50o dioperasikan di perairan Palabuhanratu. Operasi penangkapan dilakukan sebanyak 10 kali dengan waktu perendaman 3 jam per operasi penangkapan. Hasilnya menunjukkan bahwa a = 50o lebih selektif dibandingkan dengan kedua sudut kemiringan dinding lainnya. Sudut kemiringan ini menangkap 29,11% keong dengan panjang cangkang p ³ 4,27 cm. Adapun sudut kemiringan a = 40o dan a = 30o adalah 19,42% dan 10,41% dari total tangkapan keong macan.
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Kata kunci: Sudut kemiringan dan dinding perangkap jodang
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PDFDOI: https://doi.org/10.56064/maspari.v1i1.1067
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