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Author(s):  
Himu Bain ◽  
Anup Kumar Mandal ◽  
Md Monjurul Islam ◽  
Md Abu Saiyem ◽  
Md Shah Alamgir

The mud crab business is being considered by most marketing operators to be a profitable and sustainable business due to the high demand in the international market. This study aims to determine value addition at different actors-based steps; primary data was collected from 100 respondents (40 collectors, 10 fatteners, 20 depot owners, 20 suppliers and 10 exporters) who were selected randomly from Khulna, Satkhira and Dhaka district. The mud crab analysis reveals that the value addition of the fatteners was the highest among all other intermediaries which was Tk. 11525 and Tk. 10665 per 100 kg of crab for the grade XXLPD in Khulna and Satkhira district respectively, whereas the lowest value addition was Tk. 1450 and Tk. 1090 per 100 kg of crab for grade KS3. The mentioned districts’ highest value addition by depot owners were Tk. 1191 and Tk. 1200 per 100 kg of crab for the grade FF1 respectively, while lowest value addition was Tk. 691 and Tk.750 per 100 kg of crab for the grade L and M, and by suppliers it was Tk. 2918 and 2758 per 100 kg of crab for the grade FF1. The range of value addition by exporters for Hong-Kong and Taiwan market was Tk. 260.25 to Tk. 13825 per 100 kg of crab. Value addition for exporting female crab to Taiwan market was greater than Hong-Kong market.


2021 ◽  
Author(s):  
◽  
Robert George Wear

<p>1. Abbreviated or direct development is described in Pilumnus novaezelandiae Filhol, 1886 and P. lumpinus Bennett, 1964 (Xanthidae, Pilumninae) from New Zealand. Embryonic development is separated into Nauplius, Metanauplius, and embryonic Zoea stages. In P. novaezelandiae, larvae hatch at a Megalopa stage and are retained beneath the pleon of the female crab. The Megalopa larva and first five juvenile crab stages are described. In P. lumpinus emergent larvae are advanced, much-modified, and non-natatory Zoeae which are not retained by the parent. The Zoea and Megalopa larvae of this species are described. Abbreviated development has little phylogenetic significance among Brachyura, and has probably evolved as a response to habitat requirements of adult crabs. 2. A brief account is given of the systematics and distribution of the New Zealand xanthid crabs Heterozius rotundifrons A. Milne Edwards, 1867, Ozius truncatus H. Milne Edwards, 1834, and of Heteropanope (Pilumnopeus) serratifrons (Kinahan, xanthid Brachyura and to the Megalopa larvae of Heterozius rotundifrons and Ozius truncatus. Notes are given on the seasonal breeding cycle of Heterozius rotundifrons, and the pre-Zoea larva, two Zoea larval stages, and the Megalopa larva reared in the laboratory are described. Ozius truncatus possesses a pre-Zoea larva, four Zoea larval stages, and a Megalopa larva. These have been reared and are described. A key is given for the separation of the Zoea larval stages. The pre-Zoea larva and first stage Zoea larva of Heteropanope Pilumnopeus serratifrons are described. There are probably four zoeal stages in the larval development of this species. 3. The characters of Zoea larvae of the family Xanthidae described up of the present time are critically analysed and considered in relation to the status of currently accepted adult genera and species, the generic groupings used by Monod (1956), and the generic composition of the subfamilies proposed by Balss (1957). Xanthid Zoea larvae fall into two natural groups of genera based on larval characters, the most important being the length of the antennal exopod in relation to that of the spinous process. The first group is equivalent to the subfamily Xanthinae as reconstituted by Balss (1957), but there is no larval evidence suggesting that the "Panopean" genera should be separated from the "Xanthian" genera as suggested by Monod (1956). A second natural group is formed by larvae of the subfamily Menippinae as in Balss (1932, 1957), the subfamily Pilumninae of Balss (1957), and the genus Geryon. Larvae of genera in the subfamily Trapeziinae Miers should be removed from the section Hyperolissa and included in this second natural group. Zoea larvae described from the genera Heteropanope and Pilumnopeus form a separate branch of the second group. Zoea larval evidence does not support Monod's (1956) separation of Eriphia from the "Menippian" group of genera. 4. The first stage Zoea larva Hemiplax hirtipes (Jacquinot, 1853) is described, and present knowledge concerning larvae of crabs of the family Ocypodidae is summarized discussed. No diagnostic character is common to all ocypodid Zoea larvae, but affinities are shown with those of the families Hymenosomidae, Pinnotheridae, and Grapsidae. 5. Pre-Zoea and first stage Zoea larvae hatched from the grapsid crabs Leptograpsus variegatus (Fabricius, 1793), Planes marinus Rathbun, 1915, Hemigrapsus crenulatus (H. Milne Edwards, 1837), H. edwardsi (Hilgendorf, 1882), Cyclograpsus lavauxi H. Milne Edwards, 1853, Helice crassa Dana, 1851, and Plagusia chabrus (Linnaeus, 1764) from New Zealand are described. A key is given for the separation of these larvae. Known Zoea larvae of the family Grapsidae show close affinities with those of the brachyrhynchous families Ocypodidae and Gecarcinidae, and fall into four groups based on larval characters. This system of larval classification agrees with the present arrangement of adult genera into subfamilies except for a division among larvae of the subfamilies Varuninae and Sesarminae. The length of larval life and larval dispersal probably has no bearing on the presence or absence of certain New Zealand species at the Chatham Islands.</p>


2021 ◽  
Author(s):  
◽  
Robert George Wear

<p>1. Abbreviated or direct development is described in Pilumnus novaezelandiae Filhol, 1886 and P. lumpinus Bennett, 1964 (Xanthidae, Pilumninae) from New Zealand. Embryonic development is separated into Nauplius, Metanauplius, and embryonic Zoea stages. In P. novaezelandiae, larvae hatch at a Megalopa stage and are retained beneath the pleon of the female crab. The Megalopa larva and first five juvenile crab stages are described. In P. lumpinus emergent larvae are advanced, much-modified, and non-natatory Zoeae which are not retained by the parent. The Zoea and Megalopa larvae of this species are described. Abbreviated development has little phylogenetic significance among Brachyura, and has probably evolved as a response to habitat requirements of adult crabs. 2. A brief account is given of the systematics and distribution of the New Zealand xanthid crabs Heterozius rotundifrons A. Milne Edwards, 1867, Ozius truncatus H. Milne Edwards, 1834, and of Heteropanope (Pilumnopeus) serratifrons (Kinahan, xanthid Brachyura and to the Megalopa larvae of Heterozius rotundifrons and Ozius truncatus. Notes are given on the seasonal breeding cycle of Heterozius rotundifrons, and the pre-Zoea larva, two Zoea larval stages, and the Megalopa larva reared in the laboratory are described. Ozius truncatus possesses a pre-Zoea larva, four Zoea larval stages, and a Megalopa larva. These have been reared and are described. A key is given for the separation of the Zoea larval stages. The pre-Zoea larva and first stage Zoea larva of Heteropanope Pilumnopeus serratifrons are described. There are probably four zoeal stages in the larval development of this species. 3. The characters of Zoea larvae of the family Xanthidae described up of the present time are critically analysed and considered in relation to the status of currently accepted adult genera and species, the generic groupings used by Monod (1956), and the generic composition of the subfamilies proposed by Balss (1957). Xanthid Zoea larvae fall into two natural groups of genera based on larval characters, the most important being the length of the antennal exopod in relation to that of the spinous process. The first group is equivalent to the subfamily Xanthinae as reconstituted by Balss (1957), but there is no larval evidence suggesting that the "Panopean" genera should be separated from the "Xanthian" genera as suggested by Monod (1956). A second natural group is formed by larvae of the subfamily Menippinae as in Balss (1932, 1957), the subfamily Pilumninae of Balss (1957), and the genus Geryon. Larvae of genera in the subfamily Trapeziinae Miers should be removed from the section Hyperolissa and included in this second natural group. Zoea larvae described from the genera Heteropanope and Pilumnopeus form a separate branch of the second group. Zoea larval evidence does not support Monod's (1956) separation of Eriphia from the "Menippian" group of genera. 4. The first stage Zoea larva Hemiplax hirtipes (Jacquinot, 1853) is described, and present knowledge concerning larvae of crabs of the family Ocypodidae is summarized discussed. No diagnostic character is common to all ocypodid Zoea larvae, but affinities are shown with those of the families Hymenosomidae, Pinnotheridae, and Grapsidae. 5. Pre-Zoea and first stage Zoea larvae hatched from the grapsid crabs Leptograpsus variegatus (Fabricius, 1793), Planes marinus Rathbun, 1915, Hemigrapsus crenulatus (H. Milne Edwards, 1837), H. edwardsi (Hilgendorf, 1882), Cyclograpsus lavauxi H. Milne Edwards, 1853, Helice crassa Dana, 1851, and Plagusia chabrus (Linnaeus, 1764) from New Zealand are described. A key is given for the separation of these larvae. Known Zoea larvae of the family Grapsidae show close affinities with those of the brachyrhynchous families Ocypodidae and Gecarcinidae, and fall into four groups based on larval characters. This system of larval classification agrees with the present arrangement of adult genera into subfamilies except for a division among larvae of the subfamilies Varuninae and Sesarminae. The length of larval life and larval dispersal probably has no bearing on the presence or absence of certain New Zealand species at the Chatham Islands.</p>


2021 ◽  
Vol 10 (2) ◽  
pp. 175-183
Author(s):  
Iqbal Maulana ◽  
Irwani Irwani ◽  
Sri Redjeki

Rajungan (Portunus pelagicus) merupakan komoditas laut yang memiliki nilai ekonomis yang tinggi, dimana berbanding lurus dengan penangkapan yang terus meningkat. Tingkat pemanfaatan yang tidak mengindahkan ukuran dan kondisi rajungan dapat mempengaruhi struktur ukuran dan stok rajungan di suatu perairan. Penelitian ini bertujuan untuk mengetahui distribusi ukuran, hubungan lebar dan berat rajungan serta distribusi tingkat kematangan gonad (TKG) di perairan Betahwalang, Demak. Penelitian menggunakan metode survey dengan analisis yang bersifat deskriptif yang dilakukan secara “time-series”. Pengamatan sampel rajungan sebesar 10% dari hasil tangkapan yang didaratkan oleh setiap nelayan di pengepul rajungan.. Hasil dari penelitian ini menujukkan dari 3030 ekor rajungan yang diamati diketahui distribusi lebar karapas rajungan berkisar antara 35 – 185 mm dan kisaran berat sebesar 10 – 350 gram. Rajungan yang terdapat di perairan Betahwalang memiliki pertumbuhan yang bersifat allometrik positif pada rajungan jantan dan betina pada bulan Januari serta Februari.  Hasil nilai b sebesar 3,29 dan 3,08 (Januari & Februari) pada rajungan jantan. Nilai b sebesar 3,10 dan 3,15  pada rajungan betina (Januari & Februari) serta nilai b sebesar 3,14 pada keseluruhan rajungan. Sehingga diketahui pertumbuhan lebar karapas lebih cepat dibandingkan bobot rajungan. Sedangkan distribusi tingkat kematangan gonad rajungan betina adalah 21% pada TKG 1; 63% pada TKG 2; serta 16% pada TKG 3, dengan ukuran pertama kali matang gonad adalah 141,51 mm. Blue swimming crab (Portunus pelagicus) is a marine commodity has a high economic value , which is causing the crab catch to rise as well. The catch rate that does not consider the size and maturity of sea crab can affect the size structure and population stock of sea crab in waters. This study aims to determine the size distribution,the relationship of width and weight of Blue swimming crab and distribution of gonad maturity in Betahwalang, Demak. There’s a descriptive survey method used in this study with time-series observations. The sample size is about 10% of the total number landed crab from each fisherman. The results of this study showed that from 3030 crabs observed, the distribution of crab carapace width ranged from 35 – 185 mm and the weight range at 10 – 350 gram. The results showed the all crabs has a positive allometric on growth parameters. The value of  b 3,29 and 3,08 (January & February) in male blue swimming crab, 3.10 and 3.15 (January & February) on female sea crabs, and 3.14 on whole sea crabs. So it is known that the growth of carapid width is faster than the weight of crab. While the distribution of female crab gonad maturity level is 21% in level 1; 63% in level 2; and 16% in level 3, with the first size of mature gonad at 141,51 mm.


Author(s):  
Huynh Minh Sang ◽  
Le Thi Thu Thao ◽  
Ho Son Lam ◽  
Phan Minh-Thu

The reproductive biology of the land crab Gecarcoidea lalandii was documented for the Ly Son Island, Quang Ngai Province, Vietnam. Approximately 30 crabs, collected every month in the 12-month period from August 2019 to July 2020, were analyzed gonadal development stages, sex ratio, spawning season, fecundity and size at first sexual maturity. Results showed that number of male and female crab in nature was not significantly different. Gonadal of the crab passed through five stages of maturation. The crab spawns continuously during the spawning season. In nature, the crab can mature whole year-round with a higher proportion from January to August and the peak maturation from June to July.  The spawning season is of this species is only on the raining period from June to July. Length at first sexual maturity of the crab was 53.91 mm of carapace width for female and 50.39 mm male crab. The absolute fecundity varied in 473,000-820,000 eggs ind-1 and highly related to body weight. The current findings provide the scientific foundation for fishery resource management and artificial breeding of the land crab in Ly Son.


2020 ◽  
Vol 9 (4) ◽  
pp. 509-516
Author(s):  
Aninda Putri Amelia ◽  
Irwani Irwani ◽  
Ali Djunaedi

Rajungan (Portunus pelagicus) adalah hewan bercangkang keras seperti kepiting yang memiliki habitat alami hidup di laut dan biasa disebut sebagai Blue Swimming Crab. Rajungan menjadi salah satu komoditas perikanan yang memiliki nilai ekonomis yang tinggi di Indonesia. Tujuan dilakukannya penelitian ini untuk mengkaji tingkat kerentanan Rajungan (Portunus pelagicus) akibat adanya kegiatan penangkapan di Desa Paciran Kecamatan Paciran Kabupaten Lamongan, Jawa Timur. Metode yang digunakan dalam penelitian ini adalah metode Analisis PSA (Productivity and Susceptibility Analysis). Hasil analisa parameter produktivitas didapatkan dari literatur, sedangkan parameter kerentanan didapatkan dari hasil wawancara dengan nelayan setempat. Nilai PSA yang didapatkan sebesar 2,01 yang menunjukkan bahwa tingkat kerentanan masih tergolong rendah, sehingga tekanan aktivitas penangkapan belum berdampak serius terhadap potensi keberlanjutan Rajungan (Portunus pelagicus) sementara hasil pola pertumbuhan menunjukkan pola pertumbuhan allometrik negatif baik jantan dan betina. Hubungan lebar karapas dengan berat rajungan menghasilkan nilai b sebesar 2,37 untuk rajungan jantan dan 2,33 untuk rajungan betina. Sifat pertumbuhan ini menunjukkan bahwa pertumbuhan lebar karapas lebih cepat dibandingkan pertumbuhan berat rajungan. Rata rata lebar karapas yang ditemukan dilokasi penelitian 128 mm pada Rajungan jantan dan 111 mm pada Rajungan betina serta memiliki rata rata ukuran berat 115 gr baik pada Rajungan jantan dan betina.  Blue Swimming Crab (Portunus pelagicus) is a hard-shelled animal like a crab that naturally lives in the sea and is commonly referred to as the Blue Swimming Crab. The Blue Swimming Crab is one of the fishery commodities with high economic value in Indonesia. This research aimed to examine the vulnerability rate of  Blue Swimming Crab (Portunus pelagicus) due to the fishing activities in Paciran Village, Paciran, Lamongan, East Java. The method used in this study is the PSA (Productivity and Vulnerability Analysis) method. The analysis of productivity parameters’ was obtained from literature, while the vulnerability parameters are obtained from interviews with local fisherman. The PSA value was (2,01). The results indicated that the level of vulnerability is still relatively low, therefore the pressure of fishing activities has not seriously affected the potential sustainability of the Blue Swimming Crab (Portunus pelagicus) and the results of the Blue Swimming Crab growth pattern shows negative allometric growth patterns for both males and females.The relationship between carapace width and crab weight had a value of b of 2,37 for male crabs and 2,33  for female crabs. This growth characteristic showed that carapace width growth is faster than the growth of crab weight. The average width of the carapace was found in the study location 128 mm for male, and 111 mm for female crab and has an average weight size of 115 gr for both males and females.


2020 ◽  
Vol 61 (1) ◽  
pp. 39-56
Author(s):  
Eyüp Mümtaz Tiraşin ◽  
Alp Salman ◽  
Meryem Akalin ◽  
Okan Özaydin

A total of 6265 Mediterranean green crabs Carcinus aestuarii were sampled from the Gediz Delta in the eastern Aegean Sea (Turkey) during 24 sampling surveys with a 15-day interval from November 2014 to October 2015. The overall ratio of males to females was 1.8:1. Males were predominant in all sampling surveys, except in September 2015. The ranges of total weight (W) and carapace width (CW) for all crabs were 0.19–45.74 g and 8–53 mm. Male crabs were, on average, larger and heavier than females. The W–CW relationships were W=0.0004×CW2.88 for females, and W=0.0003×CW2.96 for males. The estimated von Bertalanffy growth parameters for females were: CW∞=49 mm, K=0.82 year-1 and t0=-0.9 year, and for males CW∞=54 mm, K=0.92 year-1 and t0=-0.96 year. The total mortality rates were 2.25 and 2.27 year-1 for females and males, respectively. The breeding season spans from mid fall to early spring peaking in winter. The recruitment of juveniles to the lagoon happens predominantly in summer. The median size at first maturity was 30.6 mm for females and 41.5 mm for males. The average potential fecundity estimate was 63565±36519 oocytes per female crab while the average realized fecundity was 42810±33310 eggs.


2020 ◽  
Vol 9 (1) ◽  
pp. 25-34
Author(s):  
Muhammad Amanun Tharieq ◽  
Sunaryo Sunaryo ◽  
Adi Santoso

ABSTRAK: Rajungan (P. pelagicus, Linnaeus, 1758) adalah salah satu hasil perikanan utama di Betahwalang, Demak. Penangkapan rajungan diduga dilakukan secara intensif oleh nelayan di Des Betahwalang, maka diperlukan langkah pengelolaan yang tepat untuk menjaga kelestarian dan konservasi rajungan. Informasi aspek morfometri rajungan bias digunakan sebagai salah satu acuan dalam pengelolaan rajungan berkelanjutan. Tujuan penelitian adalah untuk mengkaji tingkat kematangan gonad dan morfometri rajungan yang dilaksanakan pada bulan Juli – September 2019 di Desa Betahwalang, Demak. Penelitian menggunakan metode survey dengan analisis yang bersifat deskriptif yang dilakukan secara “time-series”. Pengamatan sampel rajungan sebesar 10% dari hasil tangkapan yang didaratkan oleh setiap nelayan di pengepul rajungan. Total rajungan yang diamati 5.480 ekor terdiri dari betina 2.960 ekor dan jantan 2.388 ekor. Hasil penelitian menunjukkan pertumbuhan rajungan jantan bersifat allometrik positif, sedangkan rajungan betina cenderung bersifat allometrik negatif dengan seks rasio relatif seimbang. Rajungan betina diduga mengalami pertama kali matang gonad pada selang kelas lebar karapas 70 – 79 mm. Sampel pengamatan fekunditas dan kematangan telur pada 126 ekor rajungan betina bertelur. Kematangan telur dilihat dari pigmen warnanya secara berurutan mulai pigmen warna kuning, orange, coklat dan hitam, serta berdasarkan ukuran diameter telur. Fekunditas telur memiliki korelasi yang sangat kuat terhadap lebar karapas yang berarti semakin besar ukuran rajungan, maka jumlah telur semakin banyak. Selama penelitian masih ditemukan rajungan “undersize” sebesar 18% (981 ekor) dan rajungan betina bertelur sebesar 24% (716 ekor), yang berarti nelayan di Desa Betahwalang belum menerapkan kriteria dan ukuran layak tangkap sesuai dengan peraturan yang berlaku.ABSTRACT: Blue swimming crab (P. pelagicus, Linnaeus, 1758) is one of main fisheries products in Betahwalang, Demak. High-intensity levels of catching the blue swimmer crab by fisherman may need sustainable management to protect and conserve the population. The purpose of this study was to determine about gonad maturity level and morphometrical aspect of blue swimming crab started from July – September 2019. There’s a descriptive survey method used in this study with time-series observations. The sample size is about 10% of the total number landed crab from each fisherman. The total sample are 5.348 that consist of 2.960 female crabs and 2.388 male crabs. The results showed the male crabs has a positive allometric on growth parameters, but the females have an allometric positive and negative growth parameters, and balanced sex-ratio. Female crabs may reach the first matured gonad level between 70 – 79 mm of carapace width. Fecundity and egg’s maturity observation used 126 berried female crabs. The egg’s maturity based on the pigment color started from yellow, became orange, brown and black also by egg diameter increase. The analysis showed that female crab fecundity has a strong correlation to the increase of carapace width, which means carapace width increase followed by egg’s amount increasing. During the study, it was found about 18% (981 crabs) the undersize crabs (<100 mm) and 24% (716 crabs) the berried female crabs, which means the Betahwalang fisherman hasn’t applied the rule yet.


2020 ◽  
Vol 9 (1) ◽  
pp. 55-64
Author(s):  
Shofi Firda Safitri ◽  
Sunaryo Sunaryo ◽  
Ali Djunaedi

 ABSTRAK: Kepiting Bakau (Scylla sp.) merupakan sumberdaya kelautan penting di Indonesia dan permintaan terhadap komoditi Kepiting Bakau cenderung meningkat, baik di pasar lokal maupun mancanegara. Peningkatan permintaan Kepiting Bakau dapat menyebabkan terganggunya populasi kepiting di alam. Penelitian ini bertujuan untuk mengkaji biomorfometrik Kepiting Bakau (Scylla sp.) yang meliputi ukuran lebar karapas Kepiting Bakau, hubungan lebar karapas dan berat, nisbah kelamin, faktor kondisi dan tingkat kematangan gonad Kepiting Bakau di perairan Bandengan Kendal pada November 2018 sampai Februari 2019. Penelitian menggunakan metode deskriptif eksploratif. Hasil penelitian menunjukkan, bahwa jumlah Kepiting Bakau yang diamati sebanyak 1914 ekor, terdiri atas 897 betina dan 1017 jantan, terdapat empat spesies Kepiting Bakau yang tertangkap di perairan Bandengan Kendal, yaitu Scylla serrata, Scylla tranquebarica, Scylla paramamosain dan Scylla olivacea, perbandingan betina dan jantan 1:1,19. Ukuran lebar karapas berkisar antara 43,75-165,5 mm dengan berat berkisar antara 23-660 g. Hubungan lebar karapas dengan berat bersifat allometrik negatif. Nilai faktor kondisi yang didapatkan berkisar 1,66–1,189. Tingkat kematangan gonad kepiting betina didominasi oleh TKG I dan II, pada bulan November 2018 – Februari 2019 di perairan Bandengan Kendal belum terjadi masa puncak pemijahan.  ABSTRACT: Mud crabs (Scylla sp.) are important marine resources in Indonesia and demand for mud crabs tends to increase, both in local and foreign markets. Increased demand for Mangrove Crabs can cause disruption to the population of crabs in nature. This study to examine the morphometrics of Mud Crabs (Scylla sp.) Which include the size of the width of the Mud Crab carapace, the relationship between carapace width and weight, sex ratio, condition factors and the level of maturity of the Mud Crab in Bandengan Kendal waters from November 2018 to February 2019. The descriptive explorative methods was used in this research. The results showed that the number of mud crabs caught from November 2018 to February 2019 was 1914, consisting of 897 females and 1017 males, there were four species of mud crabs caught in Kendal Bandengan waters, namely Scylla serrata, Scylla tranquebarica, Scylla paramamosain and Scylla olivacea, comparison of females and males 1: 1,19. Carapace widths range from 43.75 - 165.5 mm with weights ranging from 23 - 660 g. The relationship between carapace width and weight are negative allometric. The obtained condition factor values range from 1.66 - 1.189. The maturity level of female crab gonads are dominated by TKG I and II, thus it is suspected that in November 2018 - February 2019 in the waters of Bandengan Kendal, the spawning peak has not yet occurred.


BMC Genomics ◽  
2019 ◽  
Vol 20 (1) ◽  
Author(s):  
Hongling Wei ◽  
Huan Wang ◽  
Lei Tang ◽  
Changkao Mu ◽  
Chunyu Ye ◽  
...  

Abstract Background Scylla paramamosain is a commercially important mud crab. The microbiota is a community that inhabits the crab intestine, and is important for physiological functional and host health. Results Proteobacteria, Firmicutes, Bacteroidetes, Tenericutes, Spirochaetae and Fusobacteria were the dominant phyla of the 36 representative phyla. Eleven genera of the 820 representative genera were considered as core gut microbiota and were distributed in the five dominant phyla. The core genus of the Proteobacteria included Arcobacter, Photobacterium, Vibrio, Shewanella and Desulfovibrio. The other four phyla contained one or two genera. Male and female crab samples had two different core genera, (male samples: Psychrilyobacter & Lactococcus; female samples: Clostridium_sensu_stricto_11 and Candidatus_Bacilloplasma). Conclusions This is the first time core intestinal microbiota have been identified in crab from nine coastal regions of southern China. This study provides sequencing data related to the gut microbiota of S. paramamosain, and may contribute to probiotic development for S. paramamosain aquaculture industries.


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