Scylla Research Articles

Growth Potential of Mangrove Crab (Scylla serrata) in Mantehage Island Waters, Bunaken National Park, North Sulawesi

Scylla serrata is one of the dominant muddy crabs caught in Mantehage Island coastal waters, North Sulawesi. The study was aim to determine the temporal distribution of S. serrata condition i based on carapace length - weight relationship and its condition factors. Data carapace width and weight of muddy crabs collected by enumerators from Oktober 2014 to April 2015. The results showed that b value of male (2.219 – 2.835) and female (1.264-2.352) were significantly different (P<0.05). Male and female crabs have a negative allometric growth pattern with b value of males tend to be larger than females. Range of values for K and Kn male crabs longer than females that male crabs tend to be fatter. Temporal distribution of this mangrove crab condition factors is assumed to be related with the reproductive cycle. The value is increasing since October to a peak season in January which estimated related to a peak of the muddy crabs spawning season in Mantehage Island coastal waters. Key words: growth potential, Mantehage Island coastal waters, Scylla serrata _____________________________________________________________________ 1Staf Pengajar Fakultas Perikanan dan Ilmu Kelautan UNSRAT A b s t r a k Scylla serrata merupakan salah satu jenis kepiting bakau yang dominan tertangkap di perairan Pulau Mantehage Sulawesi Utara. Penelitian ini bertujuan untuk mengetahui potensi pertumbuhan kepiting bakau ditinjau dari hubungan panjang karapas dengan berat. Data panjang karapas dan berat kepiting bakau dikumpulkan melalui nelayan setempat sebagai enumerator sejak Oktober hingga April 2015. Hasil menunjukkan nilai b antara kepiting jantan (2,219 – 2,835) dan betina (1,264 - 2,352) berbeda nyata (P<0,05). Keduanya memiliki pola pertumbuhan allometrik negatif dengan nilai b kepiting jantan cenderung lebih besar dibandingkan betina. Kisaran nilai K dan Kn menunjukkan kepiting jantan lebih panjang dibandingkan betina sehingga kepiting jantan cenderung lebih gemuk. Sebaran faktor kondisi kepiting bakau diduga terkait dengan siklus reproduksinya. Nilai faktor kondisi meningkat sejak bulan Oktober 2014 hingga puncaknya pada bulan Januari 2015yang diduga pada saat tersebut merupakan puncak musim pemijahan kepiting bakau di perairan P. Mantehage. Kata kunci: potensi pertumbuhan, perairan P. Mantehage, Scylla serrata

Between Scylla and Charybdis: DSM-5/ICD-11 and RDoC in neuropsychiatry?

Between Scylla and Charybdis: DSM-5/ICD-11 and RDoC in neuropsychiatry?

Book review: Scylla: Myth, Metaphor, Paradox, written by Hopman, M.G.

Book review: Scylla: Myth, Metaphor, Paradox, written by Hopman, M.G.

Molecular Characteristic and Responsive Expression of Arginine Kinase in the Mud Crab,Scylla paramamosain

National Natural Science Foundation of China [41076081]; Fundamental Research Funds for the Central Universities [2011121011]

The Responsible Path between Scylla and Charybdis: Making Sense of Appeals to Equity in Climate Change Loss and Damage Mechanisms

Shockley uses equity to assess the moral significance of loss and damage in any successor treaty to the Kyoto Protocol. He argues that we might conceptualize loss and damage either in terms of the costs associated with rectifying a past wrong, a backward-looking accountability approach, or in terms of balancing uncertain future burdens in the face of unknown harms, a forward-looking distributional approach. Shockley argues that the forward looking approach is more practicable, better able to address problems that have not yet arisen but will arise, and better able to integrate intuitive strengths of the backward-looking view. He argues that there is good reason to think of loss and damage in terms of the opportunities and prospects that may accompany a changing climate.

The effect of several kinds of baits and moon phases on the catch of mangrove crab (Scylla serrata) with trap

Trap is one of the common fishing gears used by the fishermen to catch mangrove crabs. Using several kinds of bait could increase the fishing power of the traps. The objective of this research was to study experimentally the effect of several kinds of trap baits and moon phases toward the capture of mangrove crab. Catch data were collected using 12 units of traps,which operated in the estuary waters of Kalurae Village, Regency of Sangihe Islands. Four kinds of bait were used to trap: scads mackerel (Decapterus macarellus), little tuna (Euthynnus sp.), trevally(Caranx sp.) and chicken innards. Data were analyzed by randomized block design. Analysis of variance showed that different types of bait on the trap and moon phase caused highly significant effect on catch. Least significant differences test showed that using scads mackerel bait on the trap was not significantly different from little tuna bait, but differed significantly from trevally and chicken innards baits. Similarly, using little tuna bait was not significantly different from trevally bait, but differed significantly from chicken innards bait; and trevally bait was not different from chicken innards bait. Catching mangrove crabs with traps should use scads mackerel and little tuna baits, and be operated around the new moon phase© Bubu merupakan alat tangkap yang umum digunakan nelayan untuk menangkap kepiting bakau. Penggunaan beberapa jenis umpan, diduga dapat meningkatkan fishing power dari alat tangkap bubu. Penelitian ini bertujuan mempelajari pengaruh jenis umpan bubu dan fase umur bulan di langit terhadap hasil tangkapan kepiting bakau; dikerjakan dengan metode eksperimental. Data tangkapan dikumpulkan dengan mengoperasikan 12 unit bubu, di perairan estuari Kampung Kalurae, Kabupaten Kepulauan Sangihe. Empat jenis umpan yang diperlakukan, yaitu ikan layang (Decapterus macarellus), tongkol (Euthynnus sp.), selar (Caranx sp.) dan jeroan ayam. Data dianalisis berdasarkan Rancangan Acak Kelompok. Analisis Sidik Ragam menunjukkan bahwa perbedaan jenis umpan pada bubu dan fase umur bulan berpengaruh sangat nyata terhadap hasil tangkapan. Uji Beda Nyata Terkecil menyatakan bahwa penggunaan jenis umpan layang pada bubu tidak berbeda nyata dengan umpan tongkol, tetapi berbeda sangat nyata dengan penggunaan umpan selar dan umpan jeroan. Demikian juga penggunaan umpan tongkol tidak berbeda nyata dengan umpan selar, tetapi berbeda sangat nyata dengan umpan jeroan; sedangkan penggunaan antara umpan selar dan jeroan tidak ada perbedaan yang nyata. Umpan ikan layang dan ikan tongkol serta fase umur bulan I dan fase IV memberikan hasil tangkapan kepiting bakau yang lebih baik©

Scylla or Charybdis? Can we navigate between objectification and judgement in assessment?

Discuss ideas arising from this article at ‘discuss’

Genetic diversity in the blue swimming crab (Portunus pelagicus) and mud crab (Scylla spp.) populations of Thailand: conclusion of the study results, benefits and utilizations

Genetic diversity in blue swimming crab and mud crab populations of Thailand was studied based on the molecular genetic marker techniques, microsatellite and allozyme. Results of the study are as follows: (1) eleven pairs of microsatellite primers were developed and/or tested in the blue swimming crab, and nine pairs in the mud crabs; (2) interspecifically and allozymically, the mud crabs ( Scylla spp.) were classified into four species (the “black”, S. olivacea ; “white”, S. paramamosain ; “green”, S. serrata ; and “purple”, S. tranquebarica ); (3) with the allozyme-based analysis, the interspecific genetic structure and relationships of all the blue swimming and mud crabs species were clearly shown; (4) with the microsatellite-based analysis, informative knowledge of the genetic variability and variation in the blue swimming and mud crab populations of Thailand, and the interpopulation differentiation and structure within the crab species were attained.

Article Commentary: Practice between Scylla and Charybdis

Article Commentary: Practice between Scylla and Charybdis

Between Scylla and Charybdis

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PURIFICATION AND IDENTIFICATION OF THE MAJOR ALLERGEN OF MUD CRAB

IgE-mediated hypersensitive reactions to ingestion of crustacean are among the most serious forms of food allergies.Sensitized individuals can develop urticaria,angioedema,asthma,and even life-threatening anaphylaxis.Mud crab(Scylla serrata) is a kind of crab constitutes a promising fishery industry in China.Because of the increasing consumption of such kind of crab,the occurrence of hypersensitive reactions is extending year by year.Although tropomyosin is assumed to be a major allergen in crustaceans,few experimental data are available on allergens in crabs in China,such as Mud crab.Thus,it is important to confirm whether tropomyosin is the major allergen of Mud crab or not.In order to characterize and confirm the biochemical quality of Mud crab allergen,we report herein the isolation,identification,and determination of the major allergen of Mud crab.Crude cooked extract of Mud crab muscle was used as antigen and sera samples from 11 crustacean-allergic patients used as antibody investigated by Western-blot.Allergen with molecular mass about 38 kD was detected by all of 11 sera with crustacean allergy by Western-blot,suggesting this protein was the major allergen of Mud crab.The 38 kD protein was purified to homogeneity by isoelectric point precipitation,ammonium sulfate fractionation,and heating,and it was further characterized as tropomyosin.Polyclonal antibody against Mud crab-tropomyosin was prepared and further purified by Protein A Sepharose affinity column.The antibody cross reacted positively with tropomyosins from other crustaceans,suggesting its potential application in the detecting of the major allergen tropomyosin in crustacean foods.The identification and characterization of the major allergen in Mud crab will facilitate not only the elucidation of cross-reactions to crustaceans but also the advance of the diagnosis and treatment of seafood allergy.The 38 kD tropomyosin allergen in Mud crab as identified in the present study will benefit further allergic studies not only in this species of crab but also in other species of aquatic products.

Stories of Scylla and Charybdis in Homer and Vergil (Italian)

A comparison between Odyssey's book 12 and Aeneis' book 3 shows some similarities in the handling of the myth: Scylla and Charybdis are hidden creatures, which the reader of both the poems can glimpse only behind the veil of the description of the seers Elenus and Circe. In the Vergilian version, however, there are traces of the rationalizations of the myth operated by Sallust and Lucrece.

The Self-Divisions of Scylla

In the post-Homeric tradition the sea-monster Scylla is characterized by a duality that manifests itself both in her physical hybridity and in more abstract ways relating to textuality and to fictionality. Ovid, developing features of the Virgilian Scylla, exploits the dualities of Scylla; the self-division of Scylla then lends itself to the purposes of post-classical authors, Spenser, Shakespeare, Milton, who write to specific theological and allegorical agendas.

The Occurrence and Distribution of Stalked Barnacles of the Genus Octolasmis on the Gills of Mud or Mangrove Crab, Genus Scylla

[Several specimens of the mud crab, Scylla cf. tranquebarica (Fabricius, 1798), were examined for the presence of stalked barnacles on the gills. Eighty-five percent of the crabs, for the size group 50 to 108 mm carapace width, were found infested with stalked barnacles. In all crabs, the barnacles were found attached to the inner (hypobranchial) surface of the gill with the exception of a single crab in which the barnacles were also found attached to the outer (epibranchial) surface of the gill. The stalked barnacles were identified as Octolasmis cor (Aurivillius, 1892) and O. angulata (Aurivillius, 1894), and our size-frequency data support the view that they are indeed distinct species. Their distribution on various parts of the gills, i.e., proximal, medial, or distal, was noted. Most of the barnacles were found attached to the medial part of the gill (O. cor 55%; O. angulata 57%), followed by the proximal part (O. cor 31%; O. angulata 38%), and the distal part (O. cor 14%; O. angulata 5%). Gill number 7 bore the maximum number of O. cor (33%) found, whereas gill number 4 harboured the maximum number of O. angulata (30.2%). Divers specimens du crabe Scylla cf. tranquebarica (Fabricius, 1798), ont ete examines pour rechercher la presence de bernacles pedoncules sur les branchies. Un total de 85% des crabes, pour le groupe de taille de 50 a 108 mm de largeur de carapace, ont ete trouves infestes par des bernacles pedoncules. Dans tous les crabes, les bernacles ont ete trouves accroches a la face interne de la branchie (hypobranchie) a l'exception d'un seul crabe chez lequel les bernacles ont ete trouves sur la surface externe (epibranchie) de la branchie. Les bernacles ont ete identifies comme Octolasmis cor (Aurivillius, 1892) et O. angulata (Aurivillius, 1894) et nos observations sur la distribution des tailles soutiennent l'hypothese qu'elles sont vraiment des especes separees. Leur distribution sur les differentes parties des branchies, i. e., proximal, median ou distal ont ete notees. La plus part des bernacles ont ete trouves accroches dans la partie mediane de la branchie (O. cor 55%; O. angulata 57%), suivie par la partie proximale (O. cor 31%; O. angulata 38%), et la partie distale (O. cor 14%; O. angulata 5%). La branchie 7 porte le nombre maximum de O. cor (33%) trouves, alors que la branchie 4 accueille un maximum de O. angulata (30.2%)., Several specimens of the mud crab, Scylla cf. tranquebarica (Fabricius, 1798), were examined for the presence of stalked barnacles on the gills. Eighty-five percent of the crabs, for the size group 50 to 108 mm carapace width, were found infested with stalked barnacles. In all crabs, the barnacles were found attached to the inner (hypobranchial) surface of the gill with the exception of a single crab in which the barnacles were also found attached to the outer (epibranchial) surface of the gill. The stalked barnacles were identified as Octolasmis cor (Aurivillius, 1892) and O. angulata (Aurivillius, 1894), and our size-frequency data support the view that they are indeed distinct species. Their distribution on various parts of the gills, i.e., proximal, medial, or distal, was noted. Most of the barnacles were found attached to the medial part of the gill (O. cor 55%; O. angulata 57%), followed by the proximal part (O. cor 31%; O. angulata 38%), and the distal part (O. cor 14%; O. angulata 5%). Gill number 7 bore the maximum number of O. cor (33%) found, whereas gill number 4 harboured the maximum number of O. angulata (30.2%). Divers specimens du crabe Scylla cf. tranquebarica (Fabricius, 1798), ont ete examines pour rechercher la presence de bernacles pedoncules sur les branchies. Un total de 85% des crabes, pour le groupe de taille de 50 a 108 mm de largeur de carapace, ont ete trouves infestes par des bernacles pedoncules. Dans tous les crabes, les bernacles ont ete trouves accroches a la face interne de la branchie (hypobranchie) a l'exception d'un seul crabe chez lequel les bernacles ont ete trouves sur la surface externe (epibranchie) de la branchie. Les bernacles ont ete identifies comme Octolasmis cor (Aurivillius, 1892) et O. angulata (Aurivillius, 1894) et nos observations sur la distribution des tailles soutiennent l'hypothese qu'elles sont vraiment des especes separees. Leur distribution sur les differentes parties des branchies, i. e., proximal, median ou distal ont ete notees. La plus part des bernacles ont ete trouves accroches dans la partie mediane de la branchie (O. cor 55%; O. angulata 57%), suivie par la partie proximale (O. cor 31%; O. angulata 38%), et la partie distale (O. cor 14%; O. angulata 5%). La branchie 7 porte le nombre maximum de O. cor (33%) trouves, alors que la branchie 4 accueille un maximum de O. angulata (30.2%).]

The Scylla and Charybdis of Biosemiotics

The Scylla and Charybdis of Biosemiotics

A Comparative Study on Vitellogenin Receptor of a Lepidopteran Insect (Spodoptera litura) and a Decapod Crustacean (Scylla serrata) : Phylogenetic Implication and Co-Evolution with Vitellogenins

Insects and crustaceans offer excellent model systems to study vitellogenesis in invertebrates. This paper gives a comprehensive account of the receptor-mediated yolk protein uptake in a lepidopteran insect Spodoptera litura and a decapod crustacean Scylla serrata . The vitellogenin (Vg) of both these arthropods has been characterized using electrophoretic and immuno-blotting techniques. The Vg's of both the animals are glycolipoproteins and exhibit immunological identity with their respective lipovitellins (Lv's). The physico-chemical characterization of vitellogenin receptors (VgR) of these arthropods revealed several similarities in their molecular weight and binding affinity with vitellins, which was increased considerably by divalent cation calcium. On the other hand, their binding affinity decreased significantly when treated with polyanionic suramin. These properties, along with the strong affinity of crab VgR for mammalian LDL and VLDL, qualify them as members of LDLR superfamily. The receptor-mediated endocytotic entry of Vg into the oocytes has been demonstrated by immunogold electron microscopic technique. The pathway starting from the formation of coated pits to the formation of mature endosomes has been traced using antibodies of Vg and VgR and gold-labeled secondary goat antibody. Use of green immunofluorescence techniques with FITC-tagged Vg antibody of S. litura produced additional evidence for endocytotic yolk protein uptake as well as uneven distribution of yolk within the oocytes.

Between the Scylla of ‘Little Homeland’ and the Charybdis of Globalisation

Between the Scylla of ‘Little Homeland’ and the Charybdis of Globalisation

Comparative study of two feeds of mud crab, &lt;i&gt;Scylla serrata&lt;/i&gt;

Key words: Crabling; starter; snail meat Univ. j. zool. Rajshahi Univ. Vol.22, 2003. pp. 125-130

Between Scylla and Charybdis

Between Scylla and Charybdis

The OSCE Office in Minsk: Three years between Scylla and Charybdis

The OSCE Office in Minsk: Three years between Scylla and Charybdis