Fakhirah Ahmad, Yushinta Fujaya, Dody Dharmawan Trijuno, and Siti Aslamyah. 2015. Acceleration of Blue Swimming Crab (Portunus pelagicus) Larval Development by Phytoecdysteroid. Aquacultura Indonesiana, 16 (2): 50-55. Phytoecdysteroid is a mimic of hormone-like molt regulating hormone in arthropoda and crustacea. The aim of this research was to investigate the response of blue swimming crab (Portunus pelagicus) larvae on various doses /100 g artificial diet) were used in this research. Larval development and survival rate were measured. The results showed that the larvae development rate increased of vitomolt enrichment in predigested artificial diet. Four doses of vitomolt (0; 4; 40; 400 mg in congruent with the dose of vitomolt. However, highest survival rate was found on 4 mg vitomolt/100 g artificial diet (P>0.05). Based on regression analysis, it is estimated the optimal dose of vitomolt for larval development rate and survival rate was about 23 mg/100 g of artificial diet. Vitomolt application in artificial diet could be used to accelerate the larval development rate in blue swimming crab.

This study aims to determine the substitution rate of Artemia naupli to Phronima sp., which produces high-quality seahorses H. Barbouri juveniles This research was carried out using CRD (Completed Randomized Design) with five treatments and three replications. The treatments were natural feeding with different levels of substitution, (A) 100% Artemia nauplii, (B) 75% Artemia nauplii+25% Phronima sp. (C) 50% Artemia nauplii +50% Phronima, (D) 25% Artemia nauplii+75% Phronima sp. and (E) 100% Phronima sp. Data were analyzed with Analysis of Variance and W-Tuckey test to determine the significant difference between the treatments. The parameters of the study included the analysis of feed quality (proximate and amino acid analysis) and survival. Results of the ANOVA indicated that the substitution of Artemia nauplii to Phronima sp. had a significant effect (P <0.05) on survival rate. Based on the result of the proximate analysis of Phronima, the protein and fat content is insufficient for juvenile requirements, which only ranged from 37,12% and 3,82%. The results of the amino acid analysis of Phronima, the total of essential amino acids are deficient in juvenile requirements. The treatments of C and D produces the highest survival value of 96,67%. While in E treatment produce the lowest survival value of 63,33%. Based on the juvenile quality analysis, it can be concluded that the use of Phronima as an alternative feed for seahorse juveniles H. barbouri can be given at a substitution rate of up to 75%.