The objectives of this study are to understand the effect of planting space towards<em>Caulerpa sp</em>seaweedgrowth, and to understand the best planting space towards <em>Caulerpa</em> sp seaweed growth. This research did on October until December 2018 in thefishpond of Brackish and Sea Aquaculture Laboratory PekalonganUniversity. This research used complete randomized design (CRD) which consists of three treatment and three repetition. The treatment that applied are 15 cm, 30 cm, and 45 cm of planting space. The Parameter that observed was an absolute weight growth, and water quality. Based on the result of the research showed that the highest absolute weight growth obtained on the treatment of 30 cm planting space that is 73,23gr, followed bythetreatment of 45 cm planting space that is 58,37 gr, and the last, the treatment of 15 cm planting space that is 52,43 gr. The water quality of maintenance media are, salinity ranges from 25-30 ppt, temperature ranges 29-31<sup>o</sup>C, DO ranges from 3-6, 7 mg/L, PH ranges from (6-8,5), and the brightness is 30 cm. The quality of water during research is good enough to support <em>Caulerpa</em> spseaweed growth.
Shrimp vannamei (Litopenaeus vannamei) is a kind of shrimp that has important economic value in
Indonesia, one of the inhibiting factors in increasing shrimp production is a disease caused by bacteria
vibrio sp. This disease can cause a high death. This study aims to identify and quantify the number of
Vibrio sp bacteria colonies in the hepatopancreas shrimp vannamei in ponds given probiotics, carried
out in Sampang Tigo Ponds, Degayu –Pekalongan and Central Fish Ponds Brackish Water
Aquaculture (BBPBAP), Jepara. This study was conducted on Monday 13 November 2017 to
Wednesday April 25 2018. The study was conducted on a pond with a density of 100 and 116 tail /
m3. The data of the research results were analyzed descriptively with the help of graphs and tables.
The results showed that the sample of each plot of bacterial colonies exceeded the threshold, that is the
average number of vibrio sp bacterial colonies on hepatopancreas shrimp T2 3,96 x 10
6
CFU/ml and
T3 plots 1,46 x 10
6
CFU/ml followed by shrimp morphological changes that have clinical signs of
vibrio sp bacteria, the state of unbalanced water quality supports the bacterialgrowth.
Keywords: Cultivation, Vannamei shrimp, Vibrio sp, Density
<p align="center"><span><span style="font-size: medium;">ABSTRACT</span></span></p><p><span><span style="font-size: medium;"><span> </span>This study was conducted to determine the effect of saponin with different doses on mortality of white snapper (Lates calcalifer). The study was conducted on 18 to 31 July 2017 at the Center for Sea Aquaculture Development (BBPBL) Pesawaran District, Lampung. The experimental design used was Completely Randomized Design (RAL) with 4 treatments and 3 replications. The treatments included, treatment A (3 ppm), B treatment (5 ppm), C treatment (7 ppm), and D treatment (9 ppm). The results showed that administration of saponin with different doses gave a very significant effect on mortality of white snapper (F count> F table). The fastest time of death can be in treatment D (9 ppm) that is 45 minutes, followed by treatment of C (7 ppm) that is 74.6 minutes, then treatment B (5 ppm) is 91 minutes and longest time of death in treatment A ( 3 ppm) ie 128.6 minutes. The water quality of the research media is still feasible for the medium of snapper maintenance ie temperature 290 C, salinity 33 ppt, pH 7.82-8,10, DO 5,6-6,4, ammonia 0,11-0,13 ppm </span></span></p><p><span><span><span style="font-size: medium;"> </span></span></span></p><p><span><span style="font-size: medium;">Keywords: White snapper, dose of saponin, mortality<span> </span></span></span></p>
Tujuan penelitian ini adalah untuk mengkaji rekayasa teknologi budidaya kepiting bakau yang dipelihara pada wadah basket di tambak dengan diberi pakan buatan diperkaya vitamin E dengan dosis berbeda terhadap pertumbuhan dan kelulushidupan kepiting bakau Scylla paramamosain. Metode penelitian menggunakan hewan uji kepiting bakau ukuran 145,5g±0.61 secara eksperimental dengan digunakan rancangan acak lengkap 4 perlakuan dan 3 ulangan yaitu A: diberi vit E dosis 0 g/100g pakan buatan dan tanpa rumput laut Caulerpa racemosa, B= diberi vit E 0,2g/100 g pakan pakan dan diberi 100 g rumput laut Caulerpa racemosa), C =diberi vit E dosis 0,4g/100g dan 100 g rumput laut Caulerpa racemosa), D=diberi vit E 0,6g/100g pakan dan diberi rumput laut Caulerpa racemosa bobot 100 g), selanjutnya kepiting dipelihara dalam wadah basket plastik ukuran 30x30x30 cm selama 42 hari. Data yang diperoleh adalah data pertumbuhan biomassa mutlak, kelulushidupan, FCR dan data kualitas air (suhu, salinitas, amoniak, nitrit, nitrat, oksigen). Hasil penelitian menunjukkan bahwa penggunaan pakan buatan yang diperkaya dengan vitamin E pada dosis berbeda dengan berbasis rumput laut sebagai biofilter sistem memberikan pengaruh yang nyata (P<0,05) terhadap pertumbuhan dan kelulushidupan kepiting bakau. Pertumbuhan bobot mutlak tertinggi diperoleh dari perlakuan C (58.75±1.010gr) dan kelulushidupan kepiting bakau perlakuan C (90.3333±2.309%%). Peran rumput laut Caulerpa racemosa sebagai biofilter sistem dapat memperbaiki kualitas air media pemeliharaan kepiting bakau, sehingga dapat meningkatkan kehidupan kepiting bakau yang ramah lingkungan.
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