Articles

Found 2 Documents
Search
Journal : Jurnal Akuakultur Indonesia

Growth and molting of mud crab administered by different doses of vitomolt Fujaya, Yushinta
Jurnal Akuakultur Indonesia Vol 10, No 1 (2011): Jurnal Akuakultur Indonesia
Publisher : Jurnal Akuakultur Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (136.74 KB)

Abstract

Vitomolt is a molting stimulant made from spinach (Amaranthus spp.) extracts.  The objective of this study was to optimize the dose of vitomolt injection on the growth and molting of mud crab (Scylla spp). The research was conducted in April to June 2010.  There were three doses of vitomolt tested, i.e. 9 mg/g crab, 15 mg/g, and 21 mg/g crab. The results showed that the dose of vitomolt injection had great influence on the growth and molting of mud crab.  Higher dose of vitomolt gave higher growth but its molting percentage was different.  Vitomolt dose of 15 mg/g crab was the optimal dose to induce molting of mud crab while the dose of 21 mg/g crab gave the highest growth which reached 53.6%.  However, in terms of productivity, dose of 15 mg/g crab gave the highest production of soft crab. Key words: dose, vitomolt, growth, molting, mud crab   ABSTRAK Vitomolt adalah stimulan molting yang terbuat dari ekstrak bayam (Amaranthus spp.).  Tujuan penelitian ini adalah optimalisasi dosis penyuntikan vitomolt terhadap pertumbuhan dan molting kepiting bakau (Scylla spp).  Penelitian dilakukan pada bulan April hingga Juni 2010.  Ada tiga dosis vitomolt yang diuji, yakni: 9 mg/g, 15 mg/g, dan 21 mg/g kepiting. Hasilnya menunjukkan bahwa penyuntikan vitomolt sangat berpengaruh terhadap pertumbuhan dan molting kepiting bakau. Semakin tinggi dosis vitomolt memberikan pertumbuhan yang semakin tinggi pula namun tidak demikian terhadap persentase molting. Dosis vitomolt 15 mg/g kepiting adalah dosis optimal menginduksi molting kepiting bakau, sedangkan dosis 21 mg/g kepiting memberikan pertumbuhan tertinggi hingga 53,6%. Bila ditinjau dari produktivitas, dosis 15 mg/g kepiting memberikan produksi kepiting lunak tertinggi. Kata kunci: dosis, vitomolt, pertumbuhan, molting, kepiting bakau
Effectiveness of artificial diet enriched by spinach extract on molting stimulation to produce soft shell crab Aslamyah, Siti; Fujaya, Yushinta
Jurnal Akuakultur Indonesia Vol 10, No 1 (2011): Jurnal Akuakultur Indonesia
Publisher : Jurnal Akuakultur Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (65.469 KB)

Abstract

Artificial feed is an alternative media applications spinach extract (EB) that is known to contain molting stimulant. However, utilization of the artificial feed is related to its expensive cost, with a very high protein concentration since its mainly produced from fish based materials, so need to be studied artificial feed formulation with substitution of vegetable material in stimulating molting and growth of mud crabs. Four formula artificial feed enriched EB (700 ng/g crab) used in this study were feed A (fish, crab shells, and cassava), feed B (fish, silage, shell crab, and cassava), feed C (fish, silage, shell crab, soy flour, and cassava), and feed D (fish, silage, shell crab, soy flour, corn starch, and pollard), trash fish and feed A without EB as control. During the test, mud crab intermolt phase was culture individually in crab box placed in pond. The results showed that the percentage of molting and weight growth in their respective in the feed A (44% and 41.96%); feed B (56% and 31.57%); feed C (74% and 23.20%); feed D (50% and 39.15%); trash feed control (24% and 50.66%); and feed A without EB (28% and 35.11%). An opposite phenomenon, where the feed C with the highest percentage of molting but with the lowest growth rate, the opposite occurs in the control of trash feed. This is apparently the effect of spinach extract as a stimulant molting, where performance can be optimized with a complete and balance nutrient composition. This prediction is supported by the analysis of protein content of crabs tested at the highest feed C treatment compared with the control feed. Key words: spinach extract, soft shell crab, molting, artificial feed, growth   ABSTRAK Pakan buatan merupakan alternatif media aplikasi ekstrak bayam (EB) yang diketahui mengandung stimulan molting.  Namun demikian, pakan buatan yang digunakan masih mahal dengan kandungan protein yang tinggi, karena berbahan dasar ikan, sehingga perlu dikaji formulasi pakan buatan dengan subtitusi berbagai bahan nabati  dalam menstimulasi molting dan pertumbuhan kepiting bakau.  Empat formula pakan buatan yang diperkaya EB (700 ng/g kepiting) digunakan pada penelitan ini, yaitu Pakan A (ikan, cangkang kepiting, dan ubi), Pakan B (ikan, silase, cangkang kepiting, dan ubi), Pakan C (ikan, silase, cangkang kepiting, tepung kedelai, dan ubi), dan Pakan D (ikan, silase, cangkang kepiting, tepung kedelai, tepung jagung, dan pollard). Pakan rucah dan pakan A tanpa EB digunakan sebagai kontrol.  Selama penelitian, kepiting bakau fase intermolt dipelihara secara individu dalam crab box yang diletakkan di tambak. Hasil penelitian menunjukkan persentase molting dan pertumbuhan bobot masing-masing pada Pakan A (44% dan 41,96%); Pakan B (56% dan 31,57%); Pakan C (74% dan 23,20%); Pakan D (50% dan 39,15%); kontrol pakan rucah (24% dan 50,66%); dan  pakan A tanpa EB (28% dan 35,11%).  Terjadi anomali, yaitu Pakan C dengan persentase molting tertinggi, tetapi dengan tingkat pertumbuhan terendah, namun terjadi sebaliknya pada kontrol pakan rucah. Hal ini diduga efek dari ekstrak bayam sebagai stimulan molting, dimana kinerjanya dapat dioptimumkan dengan komposisi nutrien lengkap dan seimbang.  Pendugaan ini didukung hasil analisis kadar protein kepiting uji pada perlakuan Pakan C tertinggi dibandingkan kontrol. Kata kunci: Ekstrak bayam, kepiting cangkang lunak, molting, pakan buatan, pertumbuhan