This research was aiming of find out the diversity of crustaceans bycatch of blue swimming crab (Portunus pelagicus) fisheries of moon period based. The method used was a survey method and sampling of crustacean bycatch was carried out during the period of bright moon (11-15 moon nights) and dark moon (27-1 moon nights). The results showed that there were 20 species of crustacean bycatch found during the study in which 17 species were found during the bright moon and 16 species were found during the dark moon. Thalamita danae species had the highest abundance during the dark and the bright moon period. The number of the male crustaceans bycatch was higher than the females for both bright and dark moon periods.Diversity index crustacean bycatch in both periods (brigh tand dark) ranged from 0.83 to 0.85. The evennes index and dominance index inthe bright and dark moon are the same (0.69 and 0.22, respectively).
Rajungan hijau (Thalamita crenata) merupakan salah satu spesies tangkapan sampingan (bycatch) utama perikanan rajungan, dan kajian tentang segi hayati dan tingkat eksploitasinya masih terbatas. Penelitian ini bertujuan mengevaluasi ukuran, nisbah kelamin, perkembangan gonad, musim pemijahan, dan tingkat eksploitasi spesies tersebut di Teluk Kendari. Sampel diambil setiap bulan pada lima lokasi pendaratan penangkapan rajungan. Tingkat eksploitasi rajungan hijau dianalisis dengan konversi kurva hasil tangkapan ke panjang dengan FISAT II. Data ditampilkan berdasarkan jenis kelamin dan periode sampling. Ukuran karapas hewan jantan lebih besar daripada betina dan betina oviger, dan nisbah kelaminnya tidak seimbang antara jantan dan betina. Perkembangan gonad hewan jantan, serta ovarium betina, dan betina oviger didominasi yang matang, dan musim pemijahannya berlangsung sepanjang tahun. Tingkat eksploitasi rajungan hijau di Teluk Kendari telah lebih tangkap (overfishing), sehingga perlu dikendalikan penangkapannya.
Kata kunci: nisbah kelamin, musim pemijahan, tangkapan sampingan, tingkat eksploitasi, Thalamita crenata
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