scholarly journals Comparative study of mud crab (Scylla serrata) fattening practices between two different systems in Bangladesh

1970 ◽  
Vol 7 (1) ◽  
pp. 151-156 ◽  
Author(s):  
M Begum ◽  
MMR Shah ◽  
Abdullah-Al Mamun ◽  
MJ Alam
Keyword(s):  
Gravid Female ◽  
Scylla Serrata ◽  
Total Production ◽  
Mud Crab ◽  
Female Crab ◽  
Benefit Cost Analysis ◽  
Net Profit ◽  
Benefit Cost ◽  
Brackishwater Pond ◽  
Better Than

A study was conducted to compare the survival, production and economics of mud crab fattening in cage with fattening in encircled earthen brackishwater pond. Thirty cages of 1m (L) × 1m (W) × 0.3m (H) partitioned into 16 compartments (each 25 × 25 × 30 cm) were set in a 40 m2 pond and another pond with same area was encircled with bamboo fence. Mud crab fattening in cage and in encircled earthen area were considered as Treatment-1 and Treatment-2, respectively with three replications each to compare the fattening system. Single adult non-gravid female crab (204.42 ± 2.58g) was stocked into each compartment of the cages and 80 crabs (204.42± 2.58g) were also stocked into earthen pond @ 2 indiv./ m2. The crabs were fed with chopped tilapia @ 8% of body weight twice daily. Survival rate of crab was found 93.75 ± 6.25% and 86.12 ± 2.16% respectively in cages and encircled earthen area. Significantly (P<0.05) higher total production of crab from cages (3.30±0.08 kg/m2) was recorded than the encircled earthen area (0.37±0.01 kg/m2). Comparative benefit-cost analysis showed that bamboo cage fattening attained higher net profit (Tk 91,630.00) than crab fattening in encircled earthen area (Tk 9,345.00) from 12 crops (12-16 days per crop) fattening period. The present study revealed that mud crab fattening using bamboo cage might be better than encircled earthen area with fencing in Bangladesh. Keywords: Mud crab; Fattening; Bamboo cage; Encircled earthen pond; Bangladesh DOI: 10.3329/jbau.v7i1.4978 J. Bangladesh Agril. Univ. 7(1): 151-156, 2009

scholarly journals Contingent Valuation: Is Some Number Better than No Number?

1994 ◽  
Vol 8 (4) ◽  
pp. 45-64 ◽  
Author(s):  
Peter A Diamond ◽  
Jerry A Hausman
Keyword(s):  
Cost Analysis ◽  
Willingness To Pay ◽  
Contingent Valuation ◽  
Damage Assessment ◽  
Survey Methodology ◽  
Market Outcomes ◽  
Benefit Cost Analysis ◽  
Benefit Cost ◽  
Embedding Effect ◽  
Better Than

Without market outcomes for comparison, internal consistency tests, particularly adding-up tests, are needed for credibility. When tested, contingent valuation has failed. Proponents find surveys tested poorly done. To the authors’ knowledge, no survey has passed these tests. The ‘embedding effect’ is the similarity of willingness-to-pay responses that theory suggests (and sometimes requires) be different. This problem has long been recognized but not solved. The authors conclude that current methods are not suitable for damage assessment or benefit-cost analysis. They believe the problems come from an absence of preferences, not a flaw in survey methodology, making improvement unlikely.

scholarly journals The Economic Empowerment of Women in Uganda Through Mushroom Production

2017 ◽  
Vol 5 (11) ◽  
pp. 1401 ◽  
Author(s):  
Ibarahim Mayanja ◽  
Tolga Tipi
Keyword(s):  
Rural Areas ◽  
Poor Quality ◽  
Women Farmers ◽  
Market Prices ◽  
Benefit Cost Analysis ◽  
Face To Face ◽  
Mushroom Production ◽  
Net Profit ◽  
Urban And Rural Areas ◽  
Benefit Cost

This study focuses on empowering women both in peri-urban and rural areas through mushroom production. It was conducted in Kampala Metropolitan area-Uganda, during October 2016. It focused on estimating profits, conducting benefit-cost analysis/ratio (BCR) and return on investment (ROI), finding reasons as to why women involved in the mushroom production and identifying the constraints of mushroom farming from the perspective of women as well as the possible solutions to the constraints. 29 women were interviewed face to face through the use of the questionnaires. The study revealed an average net profit of 3,464.28 US dollars, BCR of 3.84 and ROI of 2.84 per farm in a period of three months. Our study revealed that mushroom production is a profitable enterprise for women. The major reason for women to involve in mushroom was to earn income. However, a range of other reasons was given such as fast maturity of mushrooms, availability of market, healthy benefits of mushrooms, etc. were the most important reasons. The problems faced by women farmers were ranked from the most pressing problem to the least pressing problem in this order; Low market prices per kilogram of mushroom, scarcity of cotton during some seasons, poor quality mushroom spawn supplied to farmers by breeders, inadequate extension, and advisory services were the most observed problems among others. The suggested solutions were organizing farmers into groups or cooperatives in order to negotiate for better markets locally and abroad together with the help of government, researchers to carry out more research on the suitability of other substrates like bagasse other than relying on only cotton, ensuring that mushroom spawn breeders conform to the set standards of quality spawn production and re-equipping local extension workers with knowledge regarding mushroom production among others.

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

2018 ◽  
Vol 24 (3) ◽  
pp. 187
Author(s):  
Tirtadanu Tirtadanu ◽  
Umi Chodrijah
Keyword(s):  
Growth Parameters ◽  
Carapace Width ◽  
Fishing Effort ◽  
Scylla Serrata ◽  
Von Bertalanffy ◽  
Population Parameters ◽  
Mud Crab ◽  
Female Crab ◽  
Male Crab ◽  
Exploitation Rate

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.

Mud Crab (Scylla Serrata) Value Addition Analysis of Different Actors in Bangladesh

2021 ◽  
Vol 5 (2) ◽  
pp. 275-289
Author(s):  
Himu Bain ◽  
Anup Kumar Mandal ◽  
Md Monjurul Islam ◽  
Md Abu Saiyem ◽  
Md Shah Alamgir
Keyword(s):  
Hong Kong ◽  
International Market ◽  
Scylla Serrata ◽  
Primary Data ◽  
Mud Crab ◽  
Value Addition ◽  
High Demand ◽  
Sustainable Business ◽  
Female Crab

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.

scholarly journals Growth and economic performance of different supplementary feed on female mud crab (Scylla olivacea) fattening in plastic box

2020 ◽  
Vol 5 (4) ◽  
pp. 303-315
Author(s):  
Kumar Prasun Das ◽  
Subrata Mondal ◽  
Abdulla Al Asif
Keyword(s):  
Survival Rate ◽  
Low Cost ◽  
Gravid Female ◽  
Cost Effective ◽  
Apple Snail ◽  
Mud Crab ◽  
Growth And Survival ◽  
Benefit Cost Analysis ◽  
Chicken Intestine ◽  
Supplementary Feed

The present study was conducted to identify low cost feed for female mud crab (Scylla olivacea) fattening practice in plastic box and the effect of different feeds on growth and survival rate of mud crab. A number of 30 adult non-gravid female crabs were reared into rectangular shaped plastic boxes, each box containing one crab. Three types of feed such as Chicken intestine, Tilapia and Apple Snail meat were supplied as feed at 10% of body weight of the crabs once daily considered as Treatment-1, Treatment-2 and Treatment-3 respectively with 10 replications each to compare the fattening system.. The crabs in plastic boxes were floating into water to fatten for 10 days. Survival rate of crab was found 100%, 90% and 100% respectively in chicken intestine, tilapia and apple snail meat. In the experiment food conversion ratio (FCR) and specific growth rate in weight (SGRw) were varied significantly among different foods (P >0.05). Comparative benefit-cost analysis showed that use of chicken intestine as feed in crab fattening attained higher net profit than crab fattening used tilapia and apple snail s feed from 7-12 days fattening period The present study revealed that utilization of chicken intestine as feed for mud crab fattening might be better than any other feeds and cost effective in Bangladesh. Asian J. Med. Biol. Res. June 2019, 5(4): 303-315

scholarly journals Biomorfometri Kepiting Bakau di Perairan Bandengan Kendal

2020 ◽  
Vol 9 (1) ◽  
pp. 55-64
Author(s):  
Shofi Firda Safitri ◽  
Sunaryo Sunaryo ◽  
Ali Djunaedi
Keyword(s):  
Carapace Width ◽  
Scylla Serrata ◽  
Scylla Paramamosain ◽  
Mud Crab ◽  
Foreign Markets ◽  
Female Crab ◽  
Ratio Condition ◽  
Mangrove Crabs ◽  
The Relationship ◽  
Mud Crabs

 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.

A new shell disease in the mud crab Scylla serrata from Port Curtis, Queensland (Australia)

2000 ◽  
Vol 43 ◽  
pp. 233-239 ◽  
Author(s):  
LE Andersen ◽  
JH Norton ◽  
NH Levy
Keyword(s):  
Scylla Serrata ◽  
Mud Crab ◽  
Shell Disease

Characterization of Major Allergens of Local Mud Crab (Scylla serrata)

2015 ◽  
Vol 12 (1) ◽  
pp. 1 ◽  
Author(s):  
Rosmilah Misnan ◽  
Nurul Izzah Abdul Rahman ◽  
Zailatul Hani Mohd Yadzir ◽  
Noormalin Abdullah ◽  
Mohd Faizal Bakhtiar ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Arginine Kinase ◽  
Mass Spectrometry Analysis ◽  
Scylla Serrata ◽  
Mud Crab ◽  
Meat Allergy ◽  
Proteomic Approach ◽  
The World ◽  
Major Allergens ◽  
Crab Meat

Crab meat is widely consumed in several countries around the world. However, when consumed, crab meats are frequent cause of allergic reactions throughout the world. Scylla serrata is among the most common mud crab in Malaysia. In a previous study two major allergens of mud crab at 36 and 41 kDa was identified. Thus, the aim of this study is to further identify these major allergens by a proteomic approach. Protein extract was prepared and resolved by 2-dimensional electrophoresis (2-DE). Immunoblotting was then performed using reactive sera from patients with crab allergy. Major allergenic spots were then excised from the 2-DE gel and analysed by mass spectrometry. The 2-DE profile of the extract revealed approximately >100 protein spots between pH of 4.00 to 8.00. Mass spectrometry analysis has identified the 36 and 41 kDa proteins as tropomyosin and arginine kinase, respectively. Our findings indicated that tropomyosin and arginine kinase play a major role in allergic reaction to mud crab meat among local patients with crab meat allergy, and should be included in diagnostics and therapeutic strategies of this allergy.

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