scholarly journals POLA GERAKAN STADIA UMUR KEPITING BAKAU (Scylla serrata) DALAM MERESPON MAKANAN YANG BERBEDA (SKALA LABORATORIUM) The Model Movement of Mud Crab’s Life Stage (Scylla serrata) in Responds to Different Food (Laboratory Scale)

2017 ◽  
Vol 12 (1) ◽  
pp. 1
Author(s):  
Fahresa Nugraheni Supadminingsih ◽  
Aristi Dian Purnama Fitri ◽  
Asriyanto Asriyanto
Keyword(s):  
Life Stage ◽  
Carapace Width ◽  
Scylla Serrata ◽  
Mud Crab ◽  
Food Factor ◽  
Fresh Food ◽  
Experimental Laboratory ◽  
Materials Used ◽  
Food Model ◽  
Food Laboratory

ABSTRAK Kepiting bakau merupakan salah satu jenis crustacea yang daur hidupnya memiliki beberapa tahapan tingkatan umur berdasarkan lebar karapas. Habitat kepiting bakau terdapat di perairan estuari hingga laut dengan kebiasaan hidup yang berbeda, terutama dalam mencari makanan dan habitat tiap stadia. Penelitian ini bertujuan untuk mengetahui pola tingkah laku kepiting bakau pada stadia umur yang berbeda terhadap makanan. Materi penelitian adalah  kelompok umur kepiting muda (lebar karapas 8 cm) dan dewasa (lebar karapas 11 cm) serta jenis makanan berupa makanan kepala ayam, ikan petek dan keong mas yang ketiganya dalam keadaan segar. Metode penelitian menggunakan eksperimen skala laboratorium dengan 2 variabel umur dan makanan dengan 6 perlakuan secara deskriptif. Hasil penelitian mengindikasikan terdapat 2 pola gerakan pola tingkah laku dimana kepiting dewasa memberikan respon langsung, sedangkan kepiting muda menunjukkan respon tidak langsung terhadap makanan. Kata kunci: Tingkah Laku, Makanan, Pola Gerakan, Umur, Kepiting Bakau  ABSTRACT The Mud Crab’s  is one of crustaceans species that their life circle have some stage based on carapas length. The Mud crab’s live in differences behavior between  estuarine trought deep sea, mostly in the feeding behavior in the different life stage. The purpose of this study is to know the model movement between life stage factor towards food factor. The materials used  in this research are sub-adult (carapace width 8 cm) and adult (carapce 11 cm) mud crab and the types of  fresh food in the form of chicken’s head, leiognathus fish, and golden snail. The methods used in this reasearch are  experimental laboratory  with two variables: the types of bait and life stage with six treatments. The result shows that the adult crab’s  movement give the direct responses, but the subadult crab give  the indirect responses to the food. Keywords: Fish behaviour, food, model Movement, Life stage, Mud crab

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 Kajian Struktur Ukuran Dan Parametr Populasi Kepiting Bakau (Scylla serrata) di Ekosistem Mangrove Teluk Bintan, Kepulauan Riau

2017 ◽  
Vol 15 (2) ◽  
Author(s):  
M. Tahmid, Achmad Fahrudin Dan Yusli Wardiatno
Keyword(s):  
Size Structure ◽  
Growth Parameters ◽  
Carapace Width ◽  
Data Retrieval ◽  
Mangrove Ecosystem ◽  
Fishing Effort ◽  
Scylla Serrata ◽  
Small Scale ◽  
Mud Crab ◽  
Mangrove Crab

ABSTRAKKepiting bakau (Scylla serrata) merupakan salah satu potensi komoditas perikanan skala kecil yang memiliki nilai ekonomi tinggi. Kelimpahan populasi dipengaruhi oleh upaya penangkapan dan kondisi ekosistem mangrove sebagai habitat utamanya. Produksi kepiting bakau di Teluk Bintan menurun dan penyebabnya belum diketahui dengan pasti. Oleh karena itu, perlu dilakukan kajian tentang biologi kepiting bakau di Teluk Bintan. Penelitian ini bertujuan untuk mengkaji status populasi kepiting bakau yang meliputi struktur ukuran, parameter pertumbuhan dan laju mortalitas dan eksploitasi. Pengambilan data kepiting bakau dilakukan dengan pendekatan yaitu fisher-based survey. Hasil penelitian menunjukkan ukuran kepiting bakau yang tertangkap mulai dari lebar karapas (CW) 64-172 mm, ukuran fase muda kepiting jantan yang tertangkap mencapai 46,62% dan betina mencapai 48,06%, keduanya hampir setengah dari tangkapan total, ini menunjukkan bahwa alat tangkap yang digunakan belum selektif. CW∞ jantan mencapai 176,93 mm lebih tinggi dari kepiting betina sebesar 169,58 mm, namun sebaliknya nilai koefesien K jantan (0,360) lebih kecil dari betina (0,390), sehingga pertumbuhan kepiting bakau betina lebih cepat dari jantan. Perkiraan angka kematian alami (M) jantan = 0,5566 dan kematian akibat penangkapan (F) jantan = 0,6434 sedangkan M betina = 0,59 dan F betina = 0,41. Laju eksploitasi (E) kepiting jantan mencapai 53,62%, ini dapat dikatakan telah terjadi lebih tangkap atau over eksploitasi. Kata kunci: Scylla serrata, parameter pertumbuhan, struktur ukuran, mangrove and Teluk Bintan ABSTRACTMud crab (Scylla serrata) is one of the potential of small-scale fishery commodities that have high economic value. The abundance of the population is affected by the fishing effort and conditions mangrove ecosystem as its main habitat. Mud crab production in the Gulf of Bintan declined and the cause is not known with certainty. Therefore, it is necessary to study on the biology of mud crab in the Gulf of Bintan. This study aims to assess the status of mangrove crab population that includes the size structure, parameters of growth and the rate of mortality and exploitation. Data retrieval is done with a mangrove crab fisher-based survey. The results showed that the size of mud crab caught from carapace width (CW) 64-172 mm, the size of the young phase male crabs caught females reached 46.62% and reached 48.06%, both are almost half of the total catch, it indicates that fishing gear used is not selective. CW∞ males reach 176.93 mm higher than the female crabs of 169.58 mm, but instead value koefesien K males (0.360) is smaller than females (0.390), so that the growth of female mud crabs faster than males. Estimated natural mortality rates (M) male = 0.5566 and deaths from arrest (F) male = 0.6434 while M females female F = 0.59 and = 0.41. The rate of exploitation (E) male crabs reached 53.62%, can be said to have occurred over fishing or over-exploitation. Keywords: Scylla serrata, growth parameters, structure size, mangrove and bay Bintan

scholarly journals HABITAT QUALITY MUD CRAB (Scylla serrata) IN MANGROVE ECOSYSTEM OF BINTAN BAY, BINTAN DISTRIC, RIAU ISLANDS

2016 ◽  
Vol 7 (2) ◽  
Author(s):  
M. Tahmid ◽  
Achmad Fahrudin ◽  
Yusli Wardiatno
Keyword(s):  
Body Weight ◽  
Data Collection ◽  
Habitat Quality ◽  
Carapace Width ◽  
Mangrove Ecosystem ◽  
The Body ◽  
Scylla Serrata ◽  
Small Scale ◽  
Mud Crab ◽  
Index Value

Mud crab (Scylla serrata) is one of small scale fisheries commodity that have high economic value and typically associated with good mangrove ecosystem. A habitat degradation will cause a serious impact on the existence of mud crab population. The puropse of this study was to assess the ecological quality of mud crab habitat condition on Bintan Bay’s mangrove ecosystem. Ecological data collection was conducted by using plots line transect for mangrove and the mud carb data collection by using fishermen catch (fisher based survey). The results showed the value of habitat quality index (HQI) of mud crab (Scylla serrata) ranged from 52-82 which mean in the “moderate” category (index value 43-66) and "good" (index value 67-90). It showed that Bintan Bay’s mangrove ecosystems was good enough to support the viability of mud crab. Habitat quality had a linier impact on body weight gain (R2 = 99.78%) and carapace width (R2= 99.21%). This showed that higher the index value of habitat quality, the size of the body weight and carapace width will increases. Keywords: Scylla serrata, habitat quality, ecology, mangroves, and Bintan Bay

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.

scholarly journals MODIFIKASI BUBU (TRAP) BERCELAH PELOLOSAN DALAM UPAYA PENANGKAPAN KEPITING BAKAU (Scylla serrata) RAMAH LINGKUNGAN

2017 ◽  
Vol 13 (1) ◽  
pp. 7
Author(s):  
Aristi Dian Purnama Fitri ◽  
Faik Kurohman ◽  
Bogi Budi Jayanto ◽  
Trisnani Dwi Hapsari ◽  
Iqbal A. Husni ◽  
...  
Keyword(s):  
Carapace Width ◽  
Scylla Serrata ◽  
Mud Crab ◽  
Trap Design ◽  
The Republic

Peraturan Menteri Kelautan Perikanan RI nomor 1 Tahun 2015 menetapkan ukuran lebar karapas untuk Kepiting Bakau (Scylla serrata) layak tangkap minimal 15 cm. Konstruksi trap yang digunakan untuk menangkap Scylla serrata di perairan Rembang memberikan peluang tertangkapnya stadia juvenille (< 10 cm CW). Trap dengan inovasi celah pelolosan diasumsikan dapat meloloskan Scylla serrata stadia juvenille. Desain celah pelolosan berbentuk segi empat terletak sepanjang bagian sisi bawah trap dengan ukuran tinggi 3 cm, memberikan hasil tangkapan Scylla serrata yang terkecil berukuran lebar karapas rata-rata 8,3 cm dibandingkan tanpa celah pelolosan dengan ukuran terkecil lebar karapas rata-rata 5,3 cm. Tertangkapnya Scylla serrata dengan desain trap bercelah pelolosan < 10 cm CW (stadia juvenille) mengindikasikan bahwa populasi biota tersebut di perairan Rembang berukuran kecil pada saat dilakukannya penelitian pada bulan April sampai dengan Juni 2016. Regulation of the Minister of Marine and Fisheries of the Republic of Indonesia No. 1 / 2015 set the legal size of Mud crab (Scylla serrata) at least 15 cm carapace width. The trap construction used to capture Scylla serrata in Rembang waters provides an opportunity for capturing juvenile stadia (<10 cm carapace width/CW). The innovation of trap with the escape gap is assumed to pass Scylla serrata juvenille stadia. The design escape gap of a rectangular is located along the underside of the trap with a height of 3 cm, giving the smallest Scylla serrata catches the width of an average carapace by 8.3 cm compared with no escape passes with the smallest size of the average carapace width of 5.3 cm. The capture of Scylla serrata with the trap design of a 10 cm CW (juvenile stadia) trap indicates that the biota population in Rembang waters is small in the case of a study in April to June 2016.  

scholarly journals Body Weight, Carapace Length and Width Relationship and Condition Factor of the Mud Crab Scylla serrata (Forskal) in Mangrove Ecosystem

2017 ◽  
Vol 9 (3) ◽  
pp. 338-343 ◽  
Author(s):  
Sarvabhowma Chakravarty MYLA ◽  
Vijaya Bharathi TIRUMANI ◽  
Rama Chandra Ganesh PATURI
Keyword(s):  
Carapace Length ◽  
Condition Factor ◽  
Carapace Width ◽  
Scylla Serrata ◽  
Regression Equations ◽  
Allometric Growth ◽  
Mud Crab ◽  
Relative Condition Factor ◽  
Males And Females ◽  
Relationship Of

The relationship of length-weight and width-weight of the carapace and the relative condition factor of mud crab Scylla serrata from Coringa Wildlife Sanctuary (Andhra Pradesh, India) was the subject of present study. Significant difference in both males and females was observed between carapace length-weight, carapace width-weight with a linear relationship. The regression values of both the sexes were found to be statistically significant. The regression equations calculated for length-weight were W= 0.00000178 L 3.1139 (r= 0.95) for males, W= 0.00000520 L 2.8056 (r=0.94) for females and for sexes combined it was W = 0.0000297 L 2.9891(r= 0.94).  In case of carapace width-weight relationship of males, females and sexes combined the regression equations were W= 0.00000121 CW 3.0426 (r= 0.92), W= 0.00000178 CW 2.775 (r=0.93) and W = 0.00000204 CW 2.9210(r= 0.92) respectively. The male crabs showed positive allometric growth whereas female had negative allometric growth. Analysis of covariance confirmed remarkable difference between males and females in the growth pattern. The mean relative condition factor (Kn values) of both males and females and of the pooled sexes ranged from 0.680 (April) to 1.029 (November). A gradual raise in Kn values was observed from small- to big- sized crabs in both the sexes. Peak values were observed in 12.0-13.9 cm size group in November.

scholarly journals Different Eye Physiology of Mud Crab (Scylla Serrata) in Different Life Stage Found in Semarang Territorial Waters

2018 ◽  
Vol 13 (1) ◽  
pp. 27-35 ◽  
Author(s):  
Aristi Dian Purnama Fitri ◽  
Herry Boesono ◽  
Agus Sabdono ◽  
Fahresa Nugraheni
Keyword(s):  
Life Stage ◽  
Scylla Serrata ◽  
Mud Crab

scholarly journals Carapace length-weight and width-weight relationships of Scylla serrata in Bulungan District, North Kalimantan, Indonesia

2017 ◽  
Vol 18 (4) ◽  
pp. 1316-1323 ◽  
Author(s):  
BAMBANG WIDIGDO ◽  
RUKISAH RUKISAH ◽  
ASBAR LAGA ◽  
AGUS A. HAKIM ◽  
YUSLI WARDIATNO
Keyword(s):  
Sex Ratio ◽  
Carapace Length ◽  
Carapace Width ◽  
Mangrove Ecosystem ◽  
Scylla Serrata ◽  
Mud Crab ◽  
B Values ◽  
Mangrove Ecosystems ◽  
Length Width ◽  
Male To Female

Widigdo B, Rukisah, Laga A, Hakim AA, Wardiatno Y. 2017. Carapace length-weight and width-weight relationships of Scylla serrata in Bulungan District, North Kalimantan, Indonesia. Biodiversitas 18: 1316-1323. The mud crab, Scylla serrata lives associated with mangrove ecosystems and is widely distributed in the Indo West-Pacific. The present work was aimed to reveal the carapace length/width-weight relationships of Scylla serrata in two mangrove ecosystem area of Bulungan District, North Kalimantan- Indonesia, i.e. Kahayan Delta and Tibi Island. The crabs were collected by using ambau pancang (trap) for two months from November to December 2016. A total of 522 individuals were collected and their carapace length, carapace width, and weight were measured. The sex ratio of total collected samples (male to female) was 1:0.79. Carapace length and width of S. serrata caught in these two study area ranged from 40 to 89 mm for male; 32 to 91 mm for female and 59 to 128 mm for male; 53 to 122 mm for female, respectively. The carapace length-weight relationships of total samples showed logarithmic equations as follow: W = -3.2194 + 2.9725 Log CL for male and Log W = -2.2010 + 2.3750 Log CL for female. While the carapace width-weight relationships are as follow: W = -3.9162 + 3.1012 Log CW for male and Log W = -2.6001 + 2.3968 Log CW for female. The b values of carapace width-weight relationship indicated that the growth pattern of male was positive allometric and female was negative allometric. Size frequency of crab population is also presented.

scholarly journals Pertumbuhan Kepiting Bakau (Scylla serrata Forsskål, 1775) dengan Ukuran Pakan Berbeda pada Budidaya dengan Sistem Baterai

2015 ◽  
Vol 18 (1) ◽  
Author(s):  
Ali Djunaedi ◽  
Sunaryo Sunaryo ◽  
Bagus Pitra Aditya
Keyword(s):  
Economic Value ◽  
Scylla Serrata ◽  
Mud Crab ◽  
Feed Conversion ◽  
Pellet Size ◽  
Fisheries Resources ◽  
Production Factors ◽  
Randomized Design ◽  
Experimental Laboratory ◽  
Completely Randomized Design

Kepiting bakau (S. serrata Forsskål, 1775) merupakan salah satu sumber daya perikanan bernilai ekonomis tinggi dan potensial untuk dibudidayakan. Pakan adalah faktor produksi yang penting dalam budidaya kepiting bakau. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh pemberian pelet yang berbeda ukuran bagi pertumbuhan kepiting bakau (S. serrata Forsskål, 1775). Metode penelitian ini menggunakkan Rancangan Acak Lengkap (RAL) dengan 3 perlakuan dan 10 kali ulangan pada masing-masing perlakuan, yaitu: perlakuan A (diameter pelet + 10 mm), perlakuan B (diameter pelet + 5 mm) dan perlakuan C (diameter pelet + 1 mm). Data laju pertumbuhan spesifik (SGR) dianalisis dengan Anova. Hasil penelitian menunjukkan bahwa perlakuan pemberian pelet yang berbeda ukuran berpengaruh sangat nyata (p<0,01) terhadap Laju Pertumbuhan Spesifik (SGR), Rasio Konversi Pakan (FCR) dan Rasio Efisiensi Protein (PER). Hal tersebut menunjukkan bahwa ukuran pellet sangat menentukan pertumbuhan Kepiting Bakau (S. serrata Forsskål, 1775).Kata Kunci : Ukuran Pelet, Kepiting Bakau (S. serrata Forsskål, 1775), Laju Pertumbuhan Spesifik (SGR) Mud crab (S. serrata Forsskål, 1775) is one of the fisheries resources that has high economic value and potential to be cultivated. Feed is one of important production factors on the mud crab farming. The purpose of this study is investigated the effect of different sizes pellets on the growth of mud crab (S. serrata Forsskål, 1775). The research method in this study was used experimental laboratory with completely randomized design (CRD) with 3 treatments and 10 replications in each treatment. Specific growthrate (SGR) data was analyzed with anova. These results indicate that administration of treatment different size pellets effect is very significant (p<0,01) on Specifik Growthrate (SGR), Feed Conversion Ratio (FCR) and Protein Efiecient Ratio (PER). Its that suggest that pellet size affect on the growthrate of the mud crab (S. serrata Forsskål, 1775).Keywords: Pellet Size, Mud crab (S. serrata Forsskål, 1775), Specific growth rate (SGR)

scholarly journals PENGARUH KADAR TRIPTOPAN PAKAN TERHADAP PERTUMBUHAN DAN SINTASAN KRABLET KEPITING BAKAU, Scylla serrata SELAMA MASA PENDEDERAN

2017 ◽  
Vol 11 (3) ◽  
pp. 259
Author(s):  
Usman Usman ◽  
Kamaruddin Kamaruddin ◽  
Asda Laining
Keyword(s):  
Control Diet ◽  
Carapace Width ◽  
Size Variation ◽  
Scylla Serrata ◽  
Optimum Level ◽  
Mud Crab ◽  
Feed Conversion ◽  
Fibre Glass ◽  
Large Size ◽  
Different Levels

Kepiting bakau bersifat kanibal dan cenderung memiliki laju pertumbuhan yang lambat ketika diberi pakan buatan. Triptopan adalah salah satu asam amino esensial untuk pertumbuhan dan merupakan prekursor pembentukan serotonin yang dapat mengontrol sifat agresif pada beberapa vertebrata. Penelitian ini bertujuan untuk mendapatkan dosis optimum triptopan pakan terhadap pertumbuhan dan sintasan krablet selama masa pendederan. Empat dosis penambahan L-triptopan dalam pakan yaitu: 0% (A); 0,25% (B); 0,5% (C); dan 1,0% (D) dengan kadar triptopan dalam pakan berturut-turut 0,41%; 0,52%; 0,67%; dan 0,96%; serta kontrol berupa pakan rebon kering (E) yang mengandung triptopan sebanyak 0,79%. Hewan uji yang digunakan adalah krablet kepiting bakau berumur 3-5 hari sejak memasuki stadia krablet. Krablet dipelihara dalam bak fiber berukuran 1,0 m x 1,0 m x 0,5 m sebanyak 15 unit dengan kepadatan masing-masing 50 ekor/m2. Selama lima minggu pemeliharaan, krablet diberi pakan uji sebanyak 30%-15%/hari. Hasil penelitian menunjukkan bahwa krablet yang diberi pakan mengandung triptopan 0,67% menunjukkan laju pertumbuhan tertinggi dan berbeda nyata (P<0,05) dengan krablet yang diberi pakan mengandung triptopan 0,41%. Rasio efisiensi protein tertinggi juga didapatkan pada krablet yang diberi pakan mengandung triptopan 0,67% dan berbeda nyata (P<0,05) dengan krablet yang diberi pakan rebon. Sintasan, konsumsi pakan harian, rasio konversi pakan, dan komposisi proksimat total tubuh krablet relatif sama di antara perlakuan, meskipun ada kecenderungan terbaik pada krablet yang diberi pakan mengandung 0,67% triptopan.The main constrain in mud crab culture is high cannibalism which are triggered by several factors such as limited space, lack of feed and large size variation. Mud crab also has relative slow growth when fed artificial diet. Tryptophan is an essential amino acid for growth and precursor of serotonin which can control natural aggressiveness in vertebrates. This study was conducted to obtain optimum level of tryptophan in diet for mud crab during nursery. Four test diets were formulated to contain different levels of supplemental L-tryptophan at: 0%, 0.25%, 0.5%, 1.0%, and as the control diet was dried mysid, so the tryptophan levels of the test diets were 0.41% (A), 0.52% (B), 0.67% (C), 0.96% (D), and 0.79% (mysid, E) respectively. Crablets (3-5 days post-methamorphosis) with average initial weight of 0.039 g were randomly distributed into 15 of 1.0 m x 1.0 m x 0.5 m fibre glass tank with density of 50 ind./tank. The crablets were fed daily the test diets at 30% to15% of biomass. After five weeks feeding trial, crablet fed the diet containing 0.67% of tryptophan had significantly (P<0.05) higher weight gain compared to crablet fed diet containing 0.41% of tryptophan. Highest protein efficiency ratio was also obtained in crablet fed the diet containing 0.67% of tryptophan and significantly different (P<0.05) with crablet fed dried mysid (control). Final carapace width, feed conversion ratio, and survival rate were not significantly different (P>0.05) among the treatments.

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