scholarly journals Growth and survival of Mud Crab, Scylla serrata, reared in bottom and floating cages within Mida Creek mangroves, coastal Kenya

2021 ◽  
Vol 24 (1) ◽  
pp. 27-34
Author(s):  
James M. Mwaluma ◽  
Boaz Kaunda-Arara
Keyword(s):  
Survival Rates ◽  
Total Weight ◽  
Scylla Serrata ◽  
Production Cycle ◽  
Mud Crab ◽  
Growth And Survival ◽  
Culture Techniques ◽  
Male Crab ◽  
Significant Difference ◽  
Mud Crabs

Abstract Mud Crab fattening is a relatively new business idea in Kenya and is highly lucrative due to the reasonable prices offered at tourist hotels. This study was aimed at developing appropriate culture techniques for Mud Crabs to maximize harvestable biomass by the local communities and avoid recruitment overfishing. Growth and survival rates for mixed sex Mud Crabs was investigated for a period of 230 days in Mida Creek, Kenya, using bottom and floating cages, and two feed types in a crab fattening experiment. Crabs attained harvestable weight by the third month for both floating (466.2 ± 137 g) and bottom cages (542.2 ± 109.3 g). There was no significant difference in mean total weight of mixed-sex crabs in the two culture systems (t = 1.75, p>0.05), however males showed significantly higher total weight gain compared to females. A higher overall survival rate was found for crabs cultured in floating cages (63.8%), compared to bottom cages (44.9%). There was no significant difference in growth performance between crabs fed gastropod tissues and those fed fish offal. The long-term specific growth rate for floating cages (0.69 g d-1) was not significantly different from that of bottom cages (0.92 g d-1). An analysis of potential return on investment showed the floating cages to be more profitable per production cycle compared to the bottom ones. The floating cage system and mono-sex male crab culture are recommended to farmers within mangrove tidal flats in Kenya.

scholarly journals Utilization of Trash Fish for Cultivation of Crablet Mud Crab (Scylla serrata)

2020 ◽  
Vol 25 (3) ◽  
pp. 110-114
Author(s):  
Heppi Iromo ◽  
Dori Rachmawani ◽  
Abdul Jabarsyah ◽  
Zainuddin Zainuddin
Keyword(s):  
Carapace Width ◽  
Survival Rates ◽  
Scylla Serrata ◽  
Mud Crab ◽  
Growth And Survival ◽  
Weight Growth ◽  
Randomized Design ◽  
Trichiurus Lepturus ◽  
Trash Fish ◽  
In The Wild

The high demand for mud crabs in North Kalimantan causes catch to increase in the wild. If it is not balanced with efforts to increase its aquaculture of mud crab, in the future there will be a decline in population. This study aims to determine the growth and survival rate of mud crab seed (crablet, Scylla serrata) in the application method of different types of trash fish. This research used a completely randomized design with 4 treatments and 3 replications. The Crablet used carapace width average 0.07-0.09 cm and weigh average 0.05-0.07 g with total 150 crablets. The treatments applied by trash fish were (A) Tilapia Fish (Oreochromis mossambicus), (B) Longfin Herrings Fish (Ilisha elongata), (C) Sword Fish (Trichiurus lepturus) and (D) Snails (Telescopium telescopium). The results were The best weight growth of crablet occurs in the treatment of T. lepturus (P>0.05) and  the highest of survival rates of crablet were found in treatment T. telescopium (P<0.05)  than the other. The trash fish were used turned out to be able survival of crablet mud crab (Scylla serrata).

scholarly journals Study of Growth and Survival of Mud Crab (Scylla serrata, Forskal) with Different Salinity Levels in culture media

2021 ◽  
Vol 934 (1) ◽  
pp. 012015
Author(s):  
Eddiwan ◽  
T Dahril ◽  
Adriman ◽  
Budijono ◽  
Efawani ◽  
...  
Keyword(s):  
Culture Media ◽  
Salt Content ◽  
Optimal Level ◽  
Scylla Serrata ◽  
Mud Crab ◽  
Growth And Survival ◽  
Mangrove Crab ◽  
Salinity Levels ◽  
B 31 ◽  
Mud Crabs

Abstract The aim of this study to find out the optimal level of salinity for the growth and survival of the mud crab (Scylla serrata). The weight of crab seeds were about 47.65-51.32 grams and the carapace length ranged from 64.35-71.30 mm, then put into 12 tanks (1 m x 1 m x 0.4 m) with a density of 4 crab seed per tank. During the maintenance of this test, mangrove crab was fed with fresh chicken intestines as much as 10% of its body weight per day. Water changes are carried out more than 150% per week. At the beginning of the experiment, each tank was conditioned to the same water salinity in all experimental units, namely 33 ppt. To see the effect of differences in salinity levels on the growth and survival of mud crabs, 4 treatments were made consisting of (A) 33 ppt salt content, (B) 31 ppt salt content, (C). The salt content is 29 ppt, and (D) the salt content is 27 ppt. From the results of this experiment, it is known that a decrease in the salt content of 4 ppt is the best treatment for the growth of mud crabs, but has no effect on the survival value.

ECTOPARASITES AND VIBRIOS ASSOCIATED WITH FATTENING CULTURED MUD CRABS [Scylla serrata (Forsskal, 1775)] FROM PEMALANG COAST, INDONESIA

2016 ◽  
Vol 78 (4-2) ◽  
Author(s):  
Sarjito Sarjito ◽  
Alfabetian Herjuno Condro Haditomo ◽  
Desrina Desrina ◽  
Ferdian Bagus Ferinandika ◽  
Lilik Setyaningsih ◽  
...  
Keyword(s):  
Bile Salt ◽  
Clinical Sign ◽  
Clinical Signs ◽  
Weak Condition ◽  
Scylla Serrata ◽  
Mud Crab ◽  
Mud Crabs

Infectious of ectoparasites and vibrios were  found as a problem in fattening mud crab. The aims of this study were to determine the clinical sign of infected mud crabs and to identify the ectoparasites and generic vibrio in the fattening mud crabs from Pemalang Coast, Indonesia. Ectoparasites were collected by smear method. Whereas, 20 isolates were collected from hepatopancreas, gills, hemolymph and injured carapace of the mud crabs. Thiosulphate Citrate Bile Salt Sucrose (TCBS) medium was used to isolate suspected vibrios. The clinical signs of mud crabs infected by ectoparasites were shown through the damaged gills and the attachment of other organisms on the gills, whereas the clinical signs of mud crabs infected by vibriosis were shown through red spot on carapace and wound in carapace, claw and abdomen, followed by weak condition. It also indicated that seven ectoparasites were Ichthyobodo sp., Epistylis sp., Carchesium sp., Vorticela sp., Octolasmis sp., Lepeophtherius sp, and Copepodit sp., whilst five Vibrios were V. harveyi, V. Cholerae, V. parahaemolyticus, V. alginolyticus and V. fischeri. 

scholarly journals Isolation and Identification ofAcholeplasmasp. from the Mud Crab,Scylla serrata

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Ji-Gang Chen ◽  
Dan Lou ◽  
Ji-Fang Yang
Keyword(s):  
Cell Wall ◽  
Scylla Serrata ◽  
Rrna Gene ◽  
Mud Crab ◽  
Isolation And Identification ◽  
A Cell ◽  
First Time ◽  
The 16S Rrna Gene ◽  
Ferment Glucose ◽  
Mud Crabs

For the first time, a mollicute-like organism (MLO) was cultured from moribund mud crabs (Scylla serrata) during an outbreak of clearwater disease in Zhejiang Province, China. The MLO displayed a fried-egg colony morphology in culture, did not possess a cell wall, and was not retained by 0.45 μm and 0.2 μm filters. It was able to ferment glucose, sucrose, lactose, and maltose, but it did not utilize arginine and urea. The MLO grew in the absence of bovine serum and was not susceptible to digitonin. Sequence analysis of the 16S rRNA gene revealed that this MLO had 99% identity withAcholeplasma laidlawiiPG-8A, which indicates that the organism isolated from mud crabs is a member of the genusAcholeplasma.

scholarly journals CRESCIMENTO E SOBREVIVÊNCIA DE QUATRO ESPÉCIES FLORESTAIS NATIVAS PLANTADAS EM ÁREAS COM DIFERENTES ESTÁGIOS DE SUCESSÃO NO RESERVATÓRIO IRAÍ-PR

FLORESTA ◽  
2011 ◽  
Vol 41 (4) ◽  
Author(s):  
Larissa De Bortolli Chiamolera ◽  
Alessandro Camargo Angelo ◽  
Maria Regina Boeger
Keyword(s):  
Native Species ◽  
Riparian Forest ◽  
Survival Rates ◽  
Water Reservoir ◽  
Open Area ◽  
Schinus Terebinthifolius ◽  
Growth And Survival ◽  
Significant Difference ◽  
Native Tree ◽  
Native Tree Species

O objetivo deste trabalho foi avaliar o crescimento e a sobrevivência de Schinus terebinthifolius, Mimosa scabrella, Podocarpus lambertii e Luehea divaricata plantadas em áreas com diferentes graus de sucessão, nas margens do Reservatório do Iraí - PR. S. terebinthifolius apresentou uma superioridade de crescimento entre os indivíduos que estavam na capoeira até os 18 meses, não diferindo mais aos 24 meses, com taxa de sobrevivência, aos 24 meses de plantio, de 81,37% para a área de capoeira e 68,15% para a área aberta. M. scabrella foi a espécie que obteve os piores índices de sobrevivência em ambas as áreas, restando, aos 24 meses, na área aberta, 13,54% das mudas implantadas, e na capoeira, 21,18%. P. lambertii apresentou sempre melhores índices de crescimento na área aberta. L. divaricata, até os 18 meses, não apresentou diferença significativa entre a área aberta e a capoeira, porém, aos 24 meses, a altura foi maior na área de capoeira e para o diâmetro foi maior na área aberta. Assim, entre as espécies estudadas, S. terebinthifolius é a espécie com maior plasticidade fenotípica, seguida por P. lambertii. L. divaricata deve ser priorizada em plantios que ofereçam maior sombreamento e M. scabrella é recomendada somente em altas densidades.Palavras-chave: Silvicultura de espécies nativas; recuperação de ambientes ciliares. AbstractGrowth and survival of four forest native species growing in areas with diferent sucessional status on Iraí’s Reservoir margins.The objective of this study was to evaluate the growth and survival of Schinus terebinthifolius, Mimosa scabrella, Podocarpus lambertii and Luehea divaricata planted in two areas with different degrees of succession, in Iraí’s water reservoir margins, State of Paraná, Brazil.S. terebinthifolius showed a superiority of the individuals who were in the regenerating area up to 18 months did not differ at 24 months and their survival rate at 24 months after planting, was 81.37% for regenerating area and 68.15% for the open area. M. scabrella was the kind that had the poorest survival rates in both areas, leaving at 24 months in the open area 13.54% of the seedlings established and regenerating area, 21.18%. P. lambertii always had the best growth rates in the open area. L. divaricata up to 18 months showed no significant difference between the open area and regenerating area, but at 24 months the time was higher for regenerating area and the diameter was greater in the open area. Thus, among the species S. terebinthifolius is the species with greater plasticity followed by P. lambertii. L. divaricata should be prioritized in plantations to provide greater shading and M. scabrella is recommended only in high densities.Keywords: Native tree species silviculture; riparian forest recuperation.

scholarly journals Morfometri Dan Pertumbuhan Scylla serrata (Filum: Arthropoda, Famili: Portunidae) Di Desa Panikel, Segara Anakan, Cilacap

2019 ◽  
Vol 22 (1) ◽  
pp. 57
Author(s):  
Widianingsih Widianingsih ◽  
Ria Azizah Tri Nuraini ◽  
Retno Hartati ◽  
Sri Redjeki ◽  
Ita Riniatsih ◽  
...  
Keyword(s):  
Condition Factor ◽  
Carapace Width ◽  
Growth Patterns ◽  
Total Weight ◽  
Scylla Serrata ◽  
High Demand ◽  
Purposive Sampling ◽  
Average Value ◽  
Female Sex ◽  
Mud Crabs

Mud crab is one of fishery commodities which is important in Indonesia . The high demand for mud crabs needs to be balanced with the right management strategy,  so that the population will not extinction.  Penikel Village, Cilacap is one of the fishing villages which catch mud crabs because of the high demand in the big cities such as Jakarta, Bandung and Bali.  The purpose of this study is  to determine the population and growth patterns of mud crabs in the Panikel Village, Kampung Laut District, Cilacap. The location of the study was determined by purposive sampling. Wadong and bubu are fishing tools to catch mud crabs. Sampling 67 mud crabs was carried out  on Juni 2016, after that, measurement of length, carapace width and total weight were carried out. Regression analysis between carapace width and total weight and condition factors were carried out to determine growth patterns. Based on the research, the average value of the S. serrata   length was 63.94±11.31 mm while the female one was 70.29±14.57 mm. The average value of carapace width is 92.28±15.51 mm (male) while for female sex was 98.71±18.38 mm. The average weight of S. serrata male crabs was 190.31±118.43 mm, while those of female sex were 210.77±120.93 mm. Furthermore, based on the analysis of the relationship between the length of weight found negative allomatric growth pattern with the value of the condition factor included in the low category both for male sex 0.73-1.93 and for female sex 0.59-1.66.  The low condition factor shows that the condition of Segara Anakan waters especially Penikel Village does not support the growth of mud crabs (S. serrata). Kepiting bakau (Scylla serrata) merupakan salah satu komoditas perikanan yang terpenting di Indonesia.  Besarnya permintaan  kepiting bakau yang tinggi perlu diimbangi dengan strategi pengelolaan yang tepat agar populasi tidak punah. Desa Penikel, Cilacap merupakan satu desa nelayan yang banyak menangkap kepiting bakau karena tingginya permintaan di kota besar seperti Jakarta, Bandung dan Bali. Tujuan dari penelitian ini untuk mengetahui populasi dan pola pertumbuhan kepiting bakau di Desa Panikel, Kecamatan Kampung Laut, Cilacap. Penentuan lokasi penelitian dilakukan secara purposive sampling. Wadong dan bubu merupakan alat tangkap untuk menangkap kepiting bakau. Pengambilan sampel kepiting sebanyak 67 individu  dilakukan pada bulan Juni 2016, setelah itu dilakukan pengukuran panjang, lebar karapas serta berat total. Analisa regresi kurva antara lebar karapas dan berat total serta  faktor kondisi dilakukan untuk mengetahui pola  pertumbuhan. Berdasarkan penelitian diperoleh nilai rata-rata panjang kepiting bakau S. serrta jantan adalah 63.94±11.31 mm sedang untuk yang betina adalah 70,29±14.57 mm. Nilai rata-rata lebar karapas adalah 92.28±15.51 mm (jantan) sedang untuk jenis kelamin betina adalah 98.71±18.38 mm. Rata-rata berat kepiting jantan S. serrata adalah 190.31±118.43 mm, sedangkan yang jenis kelamin betina adalah 210.77±120.93 mm. Selanjutnya berdasarkan analisa hubungan panjang berat ditemukan pola pertumbuhan allomatrik negatif dengan nilai factor kondisi termasuk dalam katagori rendah baik untuk jenis kelamin jantan 0,73–1,93 maupun untuk kelamin betina 0,59–1,66.  Rendahnya factor kondisi menunjukkan bahwa kondisi perairan Segara Anakan khususnya Desa Penikel tidak menunjang bagi petumbuhan kepiting bakau (S. serrata).

scholarly journals Growth analysis, mortality and exploitation level of Mud Crab Scylla serrata, Forskål 1775, (Malacostraca : Portunidae) in Mangkang Wetan waters, Semarang, Central Java, Indonesia

2020 ◽  
Vol 23 (1) ◽  
pp. 136 ◽  
Author(s):  
Ervia Yudiati ◽  
Arumning Tias Fauziah ◽  
Irwani Irwani ◽  
Agus Setyawan ◽  
Insafitri Insafitri
Keyword(s):  
Scylla Serrata ◽  
Survey Method ◽  
Mud Crab ◽  
Growth Study ◽  
High Demand ◽  
Central Java ◽  
Reference Information ◽  
Exploitation Rate ◽  
Over Exploitation ◽  
Mud Crabs

Awareness of Mud Crab over exploitation in Mangkang Wetan Waters has been noticed. One of the reference information is the growth study to determine the condition of the mud crab population. High demand encourages the fisherman to catch more, which leads to overexploitation in nature. The study aimed to estimate the growth, mortality, and exploitation rate of mud crabs. The 921 mud crabs samples were collected from Mangkang Wetan Waters from October 2018 to January 2019. The method used was the survey method. The crabs were taken once a week for 4 months. The width and weight of crab carapace were measured. The growth rate of S. serrata was 0.93/year (male) and 0.69/year (female). The natural mortality rate of S. serrata was 1.08/year (male) and 0.89/year (female), the mortality of catch (F) was 0.55/year (male) and 1.09/year (female). The rate of exploitation of male S. serrata reached 34%, and the rate of exploitation of female S. serrata was 55%. The exploitation of female S. serrata shows that overexploitation has occurred because the optimum value of exploitation (E-OPTIMUM) is equivalent to E=50%.

scholarly journals ẢNH HƯỞNG CỦA HORMONE 17α - METHYLTESTOSTERONE BỔ SUNG VÀO THỨC ĂN LÊN TĂNG TRƯỞNG, CHIỀU DÀI CÁC VÂY, TỶ LỆ SỐNG VÀ TỶ LỆ ĐỰC HÓA CỦA CÁ LIA THIA (Betta splendens Regan, 1910)

2021 ◽  
Vol 5 (3) ◽  
pp. 2689-2698
Author(s):  
Lê Quốc Phong ◽  
Bùi Văn Mướp
Keyword(s):  
Survival Rates ◽  
Siamese Fighting Fish ◽  
Betta Splendens ◽  
Growth And Survival ◽  
Aquarium Fish ◽  
Significant Difference ◽  
Male Rate

Cá lia thia hay cá xiêm đá (Betta splendens) là một loài cá cảnh nước ngọt đặc trưng được nuôi làm cảnh hoặc giải trí thông qua hình thức chọi cá. Nghiên cứu này nhằm tìm ra liều lượng hormone 17α - Methyltestosterone (17α - MT) thích hợp bổ sung vào thức ăn để nâng cao tỷ lệ đực của cá lia thia. Cá bột sau khi hết noãn hoàng cho ăn thức ăn có bổ sung hormone 17α - MT liên tục trong 21 ngày với liều lượng 0, 20, 40 và 60 mg 17α - MT/kg thức ăn, tương ứng với nghiệm thức NT1, NT2, NT3 và NT4. Cá giống được nuôi tiếp tục đến 60 ngày tuổi để xác định tăng trưởng, tỷ lệ sống và tỷ lệ chuyển giới tính trên cá. Kết quả cho thấy tăng trưởng và tỷ lệ sống thì khác biệt không có ý nghĩa thống kê giữa các nghiệm thức (p>0,05). Tỷ lệ đực và chiều dài các vây ở NT3 cao hơn có ý nghĩa thống kê so với NT1 và NT2 (p<0,05), tuy nhiên khác biệt không có ý nghĩa thống kê so với NT4 (p>0,05). Nghiệm thức NT3 đạt tỷ lệ đực hóa (93,8%), hiệu suất đực hóa (84,6%) cao nhất và khác biệt có ý nghĩa thống kê giữa các nghiệm thức (p<0,05). Nghiên cứu này cho thấy bổ sung hormone 17α - MT vào thức ăn với liều lượng 40 mg 17α - MT/kg sẽ làm tăng tỷ lệ cá lia thia đực. ABSTRACT Lia thia fish commonly called the Siamese fighting fish (Betta splendens) is a specific freshwater aquarium fish, which raising as pet or for entertainment through fish fighting. This study aimed to find out the appropriate dosage of 17α - Methyltestosterone (17α - MT) hormone supplemented into feed to enhance masculinization rate of Siamese fighting fish. Frys after completing yolk digestion were fed with 17α - MT supplemented feed continuously for 21 days at dose of 0, 20, 40 and 60 mg 17α - MT per kg of feed, respectively treatment of NT1, NT2, NT3 and NT4. Fingerlings were kept being grown for up to 60 days of age to determine the growth, survival and transsexual rates on fish. The results showed that growth and survival rates of fish were not significantly different among treatments (p>0.05). Male rate and the fin lengths of fish in treatment of NT3 were statistically higher than those treatment of NT1 and NT2 (p<0.05); however, there were not significant difference compared to treatment of NT4 (p>0.05). Masculinization rate (93,8%) and masculinizing efficiency (84,6%) in treatment of NT3 were highest and there was statistically significant difference among the treatments (p<0.05). This research showed that supplement of 17α - MT into the feed at a dose of 40 mg 17α - MT per kg of feed increased the rate of male Siamese fighting fish.  

scholarly journals Effects of different temperatures on the growth and survival of mud crab (Scylla paramamosain) larvae

2021 ◽  
Vol 13 (3) ◽  
pp. 9-16
Author(s):  
Thanh Phuong Nguyen ◽  
Tinh Em Nguyen ◽  
Thi Kim Ha Nguyen ◽  
Quoc Viet Le ◽  
Thi Thanh Huong Do
Keyword(s):  
Carapace Width ◽  
Survival Rates ◽  
Stocking Density ◽  
Scylla Paramamosain ◽  
Mud Crab ◽  
Growth And Survival ◽  
Randomized Design ◽  
Different Temperatures ◽  
Temperature Levels ◽  
Two Stages

This study aimed to evaluate the effects of temperature on the growth and survival of mud crab (Scylla paramamosain) larvae in two stages including zoea-1 to megalopa (the first experiment) and megalopa to crablet-1 (the second experiment). Each experiment was conducted in a completely randomized design with four temperature levels (27, 30, 33, and 36℃) in triplicate. Stocking density of 200 ind./L for the first experiment and 4 ind./L for the second experiment. Fiberglass tanks of 500-L (containing 300-L and 250-L of 25‰ water for the first and second experiment, respectively) were used in the experiments. The results showed that S. paramamosain larvae at zoea-3 and zoea-4 died at 33℃ or above, while the highest survival rate of this stage was found at 27℃ (11.5%). The growth and larval stage index during the zoea to megalopa stage were significantly higher in 30℃ (p<0.05) compared to those in the 27℃ treatment. In the second experiment, the survival rates of crablet-1 were highest (72.9%) at 27℃ and lowest (34,7%) at 36℃. The growth rate of crablets at this stage increased with increased temperature. The highest carapace width and weight (3.41 mm and 0.030 g, respectively) were recorded at 36℃. The findings of this study suggested that mud crab larvae should be reared at the temperature range of 27-30℃ to maximize their production.

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