The objective of the present study was to evaluate the giving of baker yeast and taurine mixture in culture media on the population density of Daphnia sp.. The completely randomized design method was used in this study with four treatments and four replications. The treatments studied were the giving of chicken manure 1 g/l as control (P0), the giving of baker yeast and taurine mixture 1 g/l (P1), the giving of baker yeast and taurine mixture 2,5 g/l (P2), and the giving of baker yeast and taurine mixture 4 g/l (P3). Daphnia sp. stocking density was 100 individu/l with the size of 1,5-2 mm. The culture period of Daphnia sp. culture was 16 days. The parameters observed in this study are population density, peak population, and water quality parameters. The ANOVA test showed that the giving of yeast and taurine mix in culture media gave significant effect on the population density of Daphnia sp. Population density of Daphnia sp. the highest was obtained in the treatment of giving 2.5 g / l of baker yeast and taurine mix in cultural media (P2) which is 1320,35 Ind / l with a peak population on the 10th day.
The objective of the present study was to evaluate the application of a combination of gamal leaf flour and eggs in commercial feed on the feed quality and feed efficiency of nirwana tilapia (Oreochromis niloticus). The completely randomized design method was used in this study with four treatments and four replications. The treatments studied were pellet without application of combination of gamal leaf flour and eggs (P0), pellet with combination gamal leaf flour 10 % / kg of feed and eggs (P1), pellet with combination gamal leaf flour 15 % / kg of feed and eggs (P2) and pellet with combination gamal leaf flour 20 % / kg of feed and eggs (P3). Nirwana tilapia fish seed stocking density was 1 individu/l with the length of 3-4 cm. The culture period of fish farming was 50 days. The ANOVA test showed that the commercial feed with the application of a combination of gamal leaf flour and eggs gave significant effect on the feed efficiency and specific growth rate of nirwana tilapia. The highest feed protein content was obtained in the P1 treatment of 30.17%. The smell of feed produced in all treatments tended to be strong and brown. The durability of feed in water which was almost close to control was treatment P1. The best dose to increase feed quality, feed efficiency and of nirwana tilapia seed is pellet with combination gamal leaf flour 10 % / kg of feed and eggs (P1).
Biofloc technology (BFT) is an alternative that can be used to provide additional feed source in addition to control and improve water quality for aquaculture. BFT can be done by adding an organic carbon source to increase the C/N ratio in the culture media to stimulate the growth of heterotrophic bacteria. The results of the observation were that the highest specific growth rate was obtained in treatment B (5ml floc) with an average value of 2.80 grams/day. The highest average length value in treatment B (5ml floc) reached 10.26 cm. The highest survival rate was in treatment B (5ml floc) with an average value of 86.78%. The highest efficiency value was found in treatment B (5ml floc) with an average of 95.90%. Based on Duncan's further test (p<0.05) the application of biofloc with an external carbon source from sweet sorghum had a significant effect on the specific growth rate, absolute growth, survival rate and feed efficiency of tilapia fry. Keywords : Biofloc; Sweet Sorghum; Tilapia Nirwana ; Aquacukture
ABSTRAKPenelitian ini bertujuan untuk mengetahui pengaruh pemberian sumber nutrien berbeda pada media kultur terhadap kepadatan populasi dan laju pertumbuhan Daphnia sp. Rancangan percobaan yang digunakan adalah rancangan acak lengkap non faktorial dengan tiga perlakuan dan lima kali ulangan. Perlakuan yang diteliti adalah kultur Daphnia sp. dengan pemberian air endapan dedak fermentasi pada media (A), kultur Daphnia sp. dengan pemberian air endapan kotoran ayam pada media (B) dan kultur Daphnia sp. dengan pemberian bakteri merah pada media (C). Padat tebar awal Dahpnia sp. pada masing-masing wadah adalah 100 ind/l. Masa pemeliharaan Daphnia sp. berlangsung selama 20 hari. Hasil penelitian menunjukkan bahwa pemberian sumber nutrien berbeda pada media kultur berpengaruh nyata terhadap kepadatan populasi dan laju pertumbuhan Daphnia sp. Kepadatan populasi dan laju pertumbuhan Daphnia sp. tertinggi diperoleh pada perlakuan pemberian bakteri merah dalam media kultur (C) yaitu 1271.8 ind/l dan 0,14 ind/l/hari. Kata Kunci : Bakteri merah, Dahpnia sp., dedak, kotoran ayam, pertumbuhan populasi ABSTRACTThis study aimed to examine the effect of different nutrient resources in culture media on population density and growth rate of Daphnia sp. The experiment design was used completely randomized design with four treatments and five replications. The treatments studied were Daphnia sp. culture with giving of fermented bran sediment water in media (A), Daphnia sp. culture with giving of chicken manure sediment water in media and Daphnia sp. culture with giving of red bacteria in media. Daphnia sp. stocking density was 100 ind/l. The culture period of Daphnia sp. was 20 days. The result showed that giving of different nutrient resources in culture media had significant effect on population density and growth rate of daphnia sp. Highest population density of Daphnia sp. and highest growth rate of daphnia sp. were obtained in treatment of C (1271.8 ind/l and 0,14 ind/l/day).
The habitat of the Jurung Fish (Tor tambra) is generally inflowing rivers, rocky bottom waters and relatively low water temperatures. This study aimed to determine the hatchability of the Jurung Fish (Tor tambra) eggs with different temperature treatments using a tray in the aquarium. The research method used is the laboratory experimental method and the experimental design is a non-factorial completely randomized design (CRD) consisting of 4 treatments and 4 replications: A (control), B (28°C), C (30°C) and D (32°C). The results showed that the application of different temperatures had a significant effect on the hatching of the Jurung Fish (Tor tambra) eggs. The results of Duncan's further test analysis showed that the 28°C temperature treatment was the best compared to other temperatures. This study recommends that further research is needed on larval abnormalities at different water temperatures.
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