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Abstract

This study assessed bycatch composition and some factors affected assemblage from blue swimming crab fisheries in semi-enclosed Pattani Bay and offshore area, the Gulf of Thailand. Samples were collected from May 2013 to September 2014 by using crab gill net. One hundred seventy four of bycatches were found within proportion of 52.2% in the bay and 49.5% from offshore. Moreover, discarded species from the bay and offshore were 26.3% and 47.1%, respectively. The most dominant species in the bay was horse shoe crab (Carcinoscorpius rotundicauda) while offshore was scaly whipray (Himantura imbricate). Abundance of bycatch in the bay was affected both by habitat (P<0.005) and season (P<0.001) while abundance from offshore was affected only by season (P<0.05). Species richness of bycatch both in the bay and offshore were influenced significantly by season (P<0.001 and P<0.005, respectively). The most abundance bycatch in the bay was found in the inner bay while at 15m depth for offshore. The result of nMDS ordination indicated a separation of three major groups of assemblage in the bay; inner, middle and outer bay but there was no obvious segregation from offshore.

Bycatch Composition and Ecological Status of Trap and Gillnet Blue Swimming Crab Fisheries in Bone Gulf, Southeast Sulawesi, Indonesia

“…The bycatch crustacean diversity index value of crab trap fisheries obtained was higher than that found in Kolono Bay, 0.471-0.648 (Hamid & Kamri, 2021), while the value of the crab gillnet fisheries obtained was higher the 0.812-0.893 in Lasongko Bay (Hamid & Wardiatno, 2018). Furthermore, the combined value of the crab gillnet fisheries obtained was lower than the 2.84-3.47 bycatch value in the Bay and Coast Pattani, Thailand (Fazrul et al, 2015). The differences in ecological index values are due to variation in the number of species and the distribution of each species of fish and crustacean bycatch between the types of fishing gear in crab fisheries, and differences in fishing intensity (Brower et al, 1990;Hamid et al, 2020).…”

Diversity of Crustaceans Bycatch of Blue Swimming Crab (Portunus pelagicus) Fisheries of Landed in Leppe village, Soropia District, Konawe Regency

“…Penelitian tentang krustasea bycatch perikanan rajungan telah dilakukan oleh beberapa peneliti sebelumnya, diantaranya adalah Kumar et al (2013) di pantai Thoothukudi, India, Fazrul et al (2015) di Berdasarkan penelitian tersebut menunjukkan bahwa adanya variasi keragaman krustasea bycatch perikanan rajungan antar lokasi periaran. Selain itu, dari sejumlah penelitian tersebut belum ada yang mengkaji keragaman krustasea bycatch perikanan rajungan berdasarkan periode bulan, sehingga hal ini menjadi kajian dalam peneitian ini.…”

“…Jumlah total jenis krustasea bycatch perikanan rajungan yang diperoleh padapenelitian ini sebanyak 20 jenis, dan ini identik dengan dilaporkan di Teluk Kolono (Hamid &Kamri 2021). Jumlah jenis krustasea bycatch yang ditemukan pada penelitian ini lebih rendah dari yang dilaporkan oleh Pillai et al (2014), Fazrul et al(2015) ). Keragamana jenis krustasea bycatch perikanan rajungan bervariasi antara lokasi perairan (Tabel 6), dan hal ini perkaitan dengan perbedaan kondisi habitat perairan, jenis alat tangkap yang digunakan, dan periode waktu penelitian (Hamid et al 2020).…”

“…Semua jenis krustasea bycatch yang dipertahankan yang diperoleh pada penelitian ini tergolong bernilai ekonomi rendah. Jumlah jenis krustasea bycatch dipertahnkan pada penelitian ini identik dengan ditemukan di Teluk Kolono (Hamid & Kamri 2021), namun lebih banyak dari ditemukan di Teluk Kung Krabaen, Thailand (Kunsook & Dumrongrojuathana 2017), namun lebih sedikit dari yang dilaporkan Fazrul et al (2015), Hamid & Wardiatno (2018a), dan Hamid et al (2020). Genus Thalamita digolongkan sebagai jenis kepiting yang berharga lebih rendah karena ukurannya relatif kecil (Ng et al 2008;Susanto &Irnawati 2014;Muhd-Farouk et al 2017;Hamid et al 2019) (Bolanos et al2012;Sant'Anna et al, 2012;Ferry et al, 2017) (Hamid et al, 2019).…”

“…Proporsi krustasea bycatch tertinggi ditemukan pada periode bulan terang, dan terendah ditemukan pada periode bulan gelap (Tabel 4). Proporsi krustasea bycatch yang ditemukan pada penelitian ini lebih rendah dari yang dilaporkna oleh Fazrul et al (2015), yaitu 49,5-52,2 %, dan Pillai et al (2014) sebesar 91%.…”