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Karakteristik habitat kepiting bakau (Scylla spp) di perairan pantai Desa Todowongi Kecamatan Jailolo Selatan Kabupaten Halmahera Barat

Agrikan: Jurnal Agribisnis Perikanan Vol 4, No 1 (2011): Agrikan: Jurnal Agribisnis Perikanan
Publisher : Sekolah Tinggi Ilmu Pertanian Wuna

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Abstract

Penelitian yang dilakukan di perairan pantai Desa Todowongi ini bertujuan untuk mengetahui karakteristik habitat kepiting bakau dengan menentukan tekstur substrat dan mengetahui kualitas perairan yang menjadi habitat kepiting bakau serta makanan alami khususnya makrozoobentos di daerah hutan mangrove Desa Todowongi. Hasil penelitian menunjukkan bahwa tekstur substrat adalah lempung berlumpur. Parameter lingkungan seperti suhu, salinitas dan pH air berada pada kondisi yang layak bagi kehidupan kepiting bakau. Makanan alami khususnya makrozoobentos yang ditemukan terdiri atas 10 jenis dengan kepadatan tertinggi pada jenis Turricula javana dan Tereblaria palustris (2,467 ind/m2)), keanekaragamannya tergolong rendah dan tidak ada jenis yang mendominasi.

Distribusi Spasial dan Temporal Kepiting Kelapa (Birgus latro Linn 1767) di Daeo Kabupaten Pulau Morotai, Maluku Utara

Jurnal Ilmu Pertanian Indonesia Vol 23, No 3 (2018): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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Abstract

This study aims to describe the size distribution of coconut crabs spatially and temporally in Daeo, Morotai Island, North Maluku. The captching was carried out at three stations, namely in areas adjacent to residential areas (station I), steep terrain with varying vegetation (station II), and shallow areas with various vegetation and coconut trees (station III). The collections of samples were conducted using coconut bait and catching directly by hand. Their lengths of cephalotorax plus rostrum (Cp+r) and thorax (TL) and weight were measured. The habitat conditions of natural vegetation were also observed. Data collected in catch (spatial) were analyzed with non-parametric Mann- Whitney (α0.05) and temporal tests with Kruskal Wallis test (α0.05). The results showed that the total numbers of catched coconut crabs were 581 individuals consisted of 314 and 267 males and femalescoconut crabs). The weight ranges of male and female coconut crabs were 50-990 and 50-520 grams, respectively. The ranges of Cp+r on male and female coconut crabs were 43.98-114.72 mm and 43.98-90.67 mm, respectively. The sizes of the TL in male and female coconut crabs were 19.56-54.86 mm and 19.56-48.65 mm, respectively. Non-parametric Mann-Whitney test of the number of spatial coconut crab catched in station I was different from those in station II and stasion III (P<0.05). The numbers coconut crabs catched were not temporally different (P>0.05). The spatial environmental qualities were not different (P>0.05) and the temporal parameters were significantly different (P<0.05) except pH that was not significantly different (P>0.05). Station III had denser vegetation than stations I and II.

Sex Ratio and Growth Pattern of Coconut Crabs Birgus latro (Crustacea, Decapoda, Cianobitidae) in North Moluccas Province, Indonesia

Journal Omni-Akuatika Vol 15, No 1 (2019): Omni-Akuatika May
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

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Abstract

Coconut crab (Birgus latro) is a crustacean that has a large size until four kilograms. The study  aimed to analyze sex ratio and growth pattern including the relationship of thorax length - body weight, thorax width - body weight and cephalothorax length plus rostrum - body weight in Daeo (Morotai Island), Laigoma (South Halmahera District) and Fitako (North Halmahera District). The sex ratio was determined using χ2 test and the growth pattern was tested by the b value through t test. The results showed sex ratio of 1: 0.9 in Daeo (n = 581), 1: 0.6 in Laigoma (n = 24), and 1: 2 in Fitako (n = 31). The relationship of thorax length, thorax width and cephalothorax length plus rostrum with body weight were strongly correlated (R2> 70%). The growth pattern of coconut crab in Daeo was negative allometric, while in Laigoma and Fitako were negative allometric and isometric.