The aim of this study was to obtain the best salinity for honey prawn (macro) egg prawn (Macrobrancium rosenbergii). This study used Completely Randomized Design, with three treatments and three replications. The results showed that with the salinity of 6 ‰ resulted in an average hatchability of 86.4%, with the salinity of 8 ‰ resulted in 70.5% hatchability, and at salinity 10 ‰ yielded hatchability of 56, 5%. The result of analysis of variance (ANOVA), hatching power of prawn egg very different between treatment. Water quality such as temperature, DO, and pH, during the study can still be tolerated by giant prawns. The results of this study recommend using a salinity of 6 ‰ to do hatching of prawn eggs.
Aim of this research were isolation of probiotics candidate from digestive tract of Danau Panggang swamp fishes and amylolitic, proteolytic, and lipolyticenzyme activity test. Sample fishes were snake head (Channa striata), climbing perch (Anabas testudineus), and Siamese gouramy (Trichogaster pectoralis) as a refresentatif sample from carnivorous, omnivorous, and herbivorous fish. Medium containing starch, skim milk and olive oil used as selective media. Result of this research was successfully isolated probiotic candidate whom grow well and had enzyme activity from C. Striata obtained 11 isolate, 12 isolate from A. testudineus and T. pectoralis respectively. Higher amilolytic activity was C3GHDP, I3PDP4 had a higher lipolytic activity, D4SSDP1 and H3PDP had a higher proteolytic activity. Among those isolate G1PDPsp had a amilolytic, proteolytic and lipolytic activity.
This study was aim to determine the different pellet feed source on the growth and survival rate of Nile tilapia. The purpose of this research was to provide information of the best feed for the growth and survival rate of Nile tilapia.Completely Randomized Design, with 3 treatments ( treatment A: community-made pellet, treatment B: commercial pellet PF500; treatment C: commercial pellet 885) and 3 replicate was used for the research. Nile tilapia with 3-4 cm length placed in nine aquariums with stocking density 6 fishes/L. Feeding treatment given twice a day at level 3 %/ body weight. The parameters observed include growth rates, survival, and feed conversion. Supporting data was observed for water quality. Observation was carried out for 30 days.The results showed that the average weight, in treatment A was 101,66 g, treatment B was 118.33 g, and treatment C was 128.33 g. The average yield of relative growth in treatment A was 111.44%, treatment B was 134.23%, and treatment C was 135.76%. Treatment C shows the highest value, then treatment B and treatment A. The average yield of feed conversion, treatment A was 1.11; treatment B 3.21; and treatment C was 3.37. Survival rate of all treatments was 100%.
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