Pengaruh Ukuran Mata Jaring Bubu Lipat Terhadap Jumlah Dan Ukuran Hasil Tangkapan Rajungan Di Perairan Utara Lamongan, Jawa Timur

Abstract

Bubu lipat merupakan alat tangkap yang banyak dioperasikan nelayan untuk menangkap rajungan, namun memiliki selektivitas rendah tergantung pada ukuran mata jaring yang digunakan. Tingkat selektivitas bubu lipat perlu ditingkatkan agar tangkapan rajungan memiliki ukuran layak tangkap sesuai peraturan. Penelitian uji coba pengoperasian bubu lipat rajungan dengan berbagai ukuran mata jaring yaitu 1¼ , 2, 2½ dan 3 inci, berbentuk bujur sangkar telah dilakukan di perairan utara Lamongan, Jawa Timur. Jumlah bubu lipat yang dioperasikan untuk setiap ukuran mata jaring sebanyak 150 unit per tawur/setting. Tujuan penelitian, untuk mengetahui pengaruh ukuran mata jaring bubu terhadap jumlah dan ukuran hasil tangkapan rajungan. Hasil analisis menunjukkan bahwa perbedaan ukuran mata jaring berpengaruh nyata terhadap hasil tangkapan bubu lipat rajungan. Hasil tangkapan rajungan dari bubu lipat mata jaring 2 inci (2,17 kg/setting) tidak berbeda nyata dengan mata jaring 1¼ inci (2,08 kg/setting). Ukuran lebar karapas (CW=carapace width) rajungan layak tangkap (> 100 mm) semakin besar dengan meningkatnya ukuran mata jaring. Nilai tertinggi prosentase tangkapan rajungan ukuran besar (CW > 100 mm), ditemukan pada bubu lipat ukuran mata jaring 3 inci mencapai 98 % dari total rajungan yang tertangkap. Collapsible crab pot is a common fishing gear that has been operated by many fishermen, however this kind of fishing gear has a low selectivity. The selectivity level of crab pot needs to be increased so that the size of crab catch comply to the allowable legal size. Fishing trials of crab pot with the mesh size of 1¼, 2, 2½ and 3 inch square-shaped has been done in the waters of north Lamongan, East Java. The objectives of this research is to determine the effect of mesh size to the number and size of the catches. The results showed that different mesh size has significant effect on the catch of pot. However the catch of a 2 inch mesh size pot (of 2.17 kg / setting) was not significantly different with the catch of pot with 1¼ inch mesh size (of 2.08 kg / setting). Percentage of BSC catch with carapace width (CW) > 100 mm increased by increasing of mesh size of net. The highest percentage (98 % of the total catch) was obtained from the 3-inch mesh sizes.

Diversity of non-targeted species on blue swimming crab Portunus pelagicus collapsible trap fishery in Pemalang, Central Java

“…Species that fishing trap fishermen often find during research are from the crustacean group, namely C. feriatus or a local name in Pemalang, namely Gerbah, which was found every month during the study with an average catch of 16 fish per month and wind crabs (P. vigil) found in four months with an average catch of 160 fish per month. This type of species is very often caught in collapsible traps, as is the case with the results of research conducted by [12], which show that the composition of the type of catch on collapsible traps includes coral crab (C. feriatus) and small crab wind (P. vigil).…”

Orange mud crab (Scylla olivacea) exploitation at Sorong waters

“…The size of the crabs that are still caught 40% below 120 mm indicates that it is necessary to adjust the size of the Bubu net fishing gear used. The size of the mesh has a significant impact on regulating the size of the captured resources [35]. Although in terms of weight, this resource has met the minimum threshold of 150 grams (Regulation of the Minister of Maritime Affairs and Fisheries Number 17 of 2021), the size of the carapace width is also a consideration in fishing activities to prevent young crabs from being caught.…”

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“…Sumber utama produksi rajungan masih mengandalkan hasil tangkapan di alam dengan alat tangkap dominan berupa bubu dan jaring insang. Bubu lipat merupakan alat tangkap rajungan yang memiliki selektivitas lebih tinggi dibandingkan dengan alat tangkap jaring kejer (gillnet), garuk dan jaring arad sehingga lebih ramah lingkungan (Marliana et al 2015, Mahiswara et al 2018.…”