Mating behaviour of the orange mud crab, Scylla olivacea: The effect of sex ratio and stocking density on mating success

Waiho, Khor; Mustaqim, Muhamad; Fazhan, Hanafiah; Norfaizza, Wan Ibrahim Wan; Megat, Fadhlul Hazmi

doi:10.1016/j.aqrep.2015.08.004

Cited by 65 publications

(30 citation statements)

References 26 publications

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“…For U. cordatus, it is known the existence of only one exemplar/ gallery (Costa 1979, Pinheiro andFiscarelli 2001), a fact that makes possible more reliable evaluations, mainly considering the discount of galleries without biogenic activities (abandoned) and those with more of one aperture, which percentage is still unknown in the literature. Therefore, information about crustacean density is relevant to crustaceans with economic importance (Pérez-Chi 2005, Saher and Qureshi 2011, Waiho et al 2015, although there are few quality data in the literature about this subject (Alberts-Hubatsch et al 2016), specially for U. cordatus, preventing accurate estimates of abundance.…”

mentioning

confidence: 99%

Density, abundance and extractive potential of the mangrove crab, Ucides cordatus (Linnaeus, 1763) (Brachyura, Ocypodidae): subsidies for fishery management

Pinheiro

Souza

Santos

et al. 2018

An. Acad. Bras. Ciênc.

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Ucides cordatus is a relevant fishery resource of Brazilian mangroves and requires legal normative to sustainable use based on stock assessment and management. This study evaluated some population parameters (structure, density, abundance, fishery potential and stock) of this crab species in Brazil Southeast (São Paulo, State), discussing the use of the results to delineate fishery management strategies. Density was monthly evaluated (September 1998 to August 1999), using five sample quadrats of 2x2 m. Density (ind.m-2) was indirectly estimated by counting the opened (with biogenic activity) and closed galleries, and contrasted with flooding level by tides using the vertical distribution of macroalgae in the base of trees. Density of U. cordatus ranges from 2 to 11 ind.m-2 (6±2 ind.m-2) and statistical difference occurred among monthly means (F=11.58; p=0.000). The relationship density vs. tidal flooding indicated a decrease of U. cordatus density in mangroves with higher levels of tidal flooding (r=-0.94; p=0.001). The total abundance of U. cordatus was estimated in 63.7 millions of crabs in 10.61 km2, with a reduction of 34.9% due to total mortality discount. Estimates like that are uncommon in literature, and could be used for fishery forecasts, allowing improvement by the introduction of new variables to be known in the future.

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mentioning

confidence: 99%

Density, abundance and extractive potential of the mangrove crab, Ucides cordatus (Linnaeus, 1763) (Brachyura, Ocypodidae): subsidies for fishery management

Pinheiro

Souza

Santos

et al. 2018

An. Acad. Bras. Ciênc.

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“…Di Indonesia kepiting bakau dominan masih diperoleh dari penangkapan di alam yaitu sebesar 61,1 % dan sisanya dari budidaya pembesaran dan penggemukan (Diantoro & Pribadi, 2017). Jenis kepiting Scylla olivacea yang paling diminati dalam budidaya karena potensial dan mempunyai daya tahan tubuh yang kuat (Karim, 2008;Waiho et al, 2015).…”

Section: Pendahuluanunclassified

DINAMIKA POPULASI DAN TINGKAT PEMANFAATAN KEPITING MERAH (Scylla olivacea) DI PERAIRAN MERAUKE DAN SEKITARNYA, PAPUA

Pane¹,

Alnanda²

2019

JURNAL PENELITIAN PERIKANAN INDONESIA

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Penangkapan kepiting merah (Scylla olivacea) di Merauke berlangsung sangat intensif dan dikuatirkan akan mengancam kelestariannya. Untuk itu perlu pengelolaan yang didasarkan hasil kajian ilmiah. Dinamika populasi dan tingkat pemanfaatan merupakan informasi komponen penting dalam pengelolan perikanan secara efektif. Tujuan penelitian ini adalah untuk mengetahui dinamika populasi dan tingkat pemanfaatan kepiting merah di Merauke dan sekitarnya. Penelitian dilakukan selama 2 (dua) tahun yaitu Februari hingga Desember 2017 dan Maret hingga Desember 2018 dengan metode survey. Hasil penelitian menunjukkan struktur ukuran kepiting merah diatas 99 % berukuran dibawah 145 mm dan ukuran pertama kali tertangkap (CWc) adalah 110.52 mm (2017) dan 112,5 mm (2018). Pola pertumbuhan kepiting merah bersifat allometrik negatif dengan nisbah kelamin tidak seimbang antara jantan dan betina. Laju pertumbuhan (K) adalah 0,6 per tahun dengan tingkat kematian alamiah (M) lebih kecil daripada kematian karena penangkapan (F). Tingkat pemanfaatan (E) 0,68 menjadi indikasi telah terjadi overfishing dari nilai optimum penangkapan kepiting. Upaya pelestarian sumberdaya kepiting dapat dilakukan dengan mengurangi upaya penangkapan sebesar 36 % dari yang sudah dilakukan saat ini.The capture of red mud crabs (Scylla olivacea) in Merauke is very intensive and threat its sustainability. For this reason, management needs to be based on the results of scientific studies. Population dynamics and exploitation rates are information about important components in fisheries management effectively. The purpose of this study was to determine population dynamics and exploitation of red mud crabs in Merauke and its adjancent. The study was conducted for 2 (two) years, February to December 2017 and March to December 2018 with the survey method. The results showed that the structure of the size of red mud crabs above 99% was under 145 mm and the first size caught (CWc) was 110.52 mm (2017) and 112.5 mm (2018). The growth pattern of red mud crabs is allometric negatif with an unbalanced sex ratio between male and female. The growth rate (K) is 0.6 per year with a natural death rate (M) smaller than death due to arrest (F). The utilization rate (E) of 0.68 indicates an overfishing of the optimum value of crab capture. Efforts to preserve crab resources can be done by reducing fishing efforts by 36% from what has been done today.

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“…Penurunan populasi tersebut diduga disebabkan kebutuhan nutrien yang tinggi bagi kepiting betina untuk perkembangan gonad dan pemijahan sehingga menyebabkan tingkat stress dan mortalitas alami yang tinggi. Waiho et al (2015) menyebutkan kepiting bakau betina akan melakukan molting sebelum kopulasi dan kegagalan molting tersebut dapat terjadi sehingga menyebabkan kematian pada kepiting bakau betina. Jumlah kepiting bakau betina di alam yang lebih kecil dibandingkan jantan dapat menghambat penambahan baru kepiting bakau sehingga stok kepiting bakau dapat mengalami penurunan.…”

Section: -196unclassified

PARAMETER POPULASI DAN TINGKAT PEMANFAATAN KEPITING BAKAU (Scylla serrata Forsskal, 1775) DI PERAIRAN SEBATIK, KALIMANTAN UTARA

Tirtadanu

Chodrijah

2018

JURNAL PENELITIAN PERIKANAN INDONESIA

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Salah satu informasi yang diperlukan untuk merumuskan pengelolaan kepiting bakau (Scylla serrata Forsskal, 1775) yang berkelanjutan adalah parameter populasi dan tingkat pemanfaatannya. Penelitian ini bertujuan untuk mengkaji parameter populasi dan tingkat pemanfaatan kepiting bakau di perairan Sebatik. Penelitian dilakukan pada Maret-Desember 2017. Sampel kepiting bakau di peroleh dari hasil tangkapan nelayan dengan alat tangkap bubu di perairan Sebatik. Pertumbuhan dianalisis berdasarkan persamaan Von Bertalanffy dengan mengamati pergeseran struktur ukuran kepiting tiap bulan dan tingkat pemanfaatan diperoleh dari metode kurva konversi panjang dengan hasil tangkapan. Hasil penelitian menunjukkan kepiting bakau yang tertangkap bubu di perairan Sebatik berukuran lebar karapas (carapace width) antara 84-144 mmCW dengan rata-rata ukuran yang tertangkap adalah 107,05±12,3 mmCW pada kepiting jantan dan 110,2±8,86 mmCW pada kepiting betina. Pertumbuhan berat kepiting bakau jantan lebih cepat dibandingkan ukurannya (b=3,6) sebaliknya pertumbuhan berat kepiting bakau betina lebih lambat dibandingkan ukurannya (b=2,5). Nisbah kelamin kepiting bakau menunjukkan kondisi tidak seimbang (5,5 : 1) dengan proporsi jantan lebih dominan dibandingkan betina. Lebar karapas asimptotik (CW) kepiting bakau jantan adalah 151,2 mmCW dan betina adalah 140,5 mmCW. Laju pertumbuhan (K) kepiting bakau adalah 0,75 tahun-1 pada kepiting jantan dan 0,79 tahun-1 pada kepiting betina. Status pemanfaatan kepiting bakau telah berada dalam tahapan mendekati lebih tangkap (E=0,5-0,55) sehingga disarankan tidak melakukan penambahan upaya penangkapan kepiting bakau di perairan Sebatik. One of the information needed for formulating the sustainable management of mud crab is the availability of information on the population parameters and its exploitation rate. The current research aimed to study the population parameters and the exploitation rate of mud crab in Sebatik Waters. Field research was conducted in March – December 2017. Samples of mud crab were obtained from the catch of fisherman by trap in Sebatik Waters. The Von Bertalanffy growth parameters were constructed through monthly modals progression analysis of the size of carapace width frequencies distributions and the exploitation rate was estimated through the method of length converted catch curve. The results showed that the carapace width of mud crabs caught by trap in Sebatik Waters ranged between 84 to 144 mmCW with the mean size of 107.05±12.3 mmCW for male and 110.2±8.86 mmCW for female. The growth of weights of male crab (b=3.6) is faster than its size, while the growth of weight of female crab was slower than its size (b=2,5). The sex ratio of mud crab was unbalanced (5.5 : 1) that the proportion of male was more dominant than female. Asymptotic carapace width (CW) of mud crab was 151.2 mmCW for male and 140.5 mmCW for female. The growth rate (K) of mud crab was 0.75 year-1 for male and 0.79 year-1 for female. The exploitation status of mud crab was starting to overfishing (E=0,5-0,55) so it suggest to not increase the fishing effort of mud crab fishery in Sebatik Waters.

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Mating behaviour of the orange mud crab, Scylla olivacea: The effect of sex ratio and stocking density on mating success

Cited by 65 publications

References 26 publications

Density, abundance and extractive potential of the mangrove crab, Ucides cordatus (Linnaeus, 1763) (Brachyura, Ocypodidae): subsidies for fishery management

Density, abundance and extractive potential of the mangrove crab, Ucides cordatus (Linnaeus, 1763) (Brachyura, Ocypodidae): subsidies for fishery management

DINAMIKA POPULASI DAN TINGKAT PEMANFAATAN KEPITING MERAH (Scylla olivacea) DI PERAIRAN MERAUKE DAN SEKITARNYA, PAPUA

PARAMETER POPULASI DAN TINGKAT PEMANFAATAN KEPITING BAKAU (Scylla serrata Forsskal, 1775) DI PERAIRAN SEBATIK, KALIMANTAN UTARA

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