Judul: Thymol supplementation in feed to improve growth performance of carp (Cyprinus carpio)
Abstrak: Ikan mas (Cyprinus carpio) merupakan salah satu ikan air tawar yang memiliki banyak peluang dalam hal pengembangan untuk potensi pasar yang terus meningkat. Penelitian ini bertujuan untuk mengevaluasi performa pertumbuhan ikan mas yang diberi pakan dengan berbagai dosis penambahan thymol. Penelitian ini menggunakan lima perlakuan, penambahan thymol pada dosis 0%, 0,1%, 0,2%, 0,4%, dan 0,8% ke dalam pakan. Setiap perlakuan diulang tiga kali. Benih ikan mas dengan bobot 3,230,00 g dipelihara di waring berukuran 2 x 1 x 1 m3 dan ketinggian air 50 cm dengan kepadatan 50 ekor m-3. Ikan dipelihara selama 60 hari. Hasil penelitian menunjukkan bahwa pemberian thymol meningkatkan kinerja pertumbuhan ikan, yang meliputi laju pertumbuhan spesifik, bobot akhir, protein efisiensi rasio dan rasio konversi pakan untuk kemudian. Pemberian thymol sebesar 0,4% dalam pakan menghasilkan nilai kinerja pertumbuhan yang maksimal pada ikan mas. Di sisi lain, nilai kelangsungan hidup ikan meningkat seiring dengan peningkatan kadar thymol di pakan. Dari penelitian ini dapat disimpulkan bahwa dosis optimal penambahan thymol di dalam pakan untuk ikan mas adalah sebesar 0,4%., Carp fish (Cyprinus carpio) is a freshwater fish that has many opportunities in terms of development for an ever-increasing market potential. This study aims to evaluate the growth performance of carp fed with various doses of thymol addition. This study used five treatments, adding thymol at doses of 0%, 0.1%, 0.2%, 0.4%, and 0.8% to feed. Each treatment was repeated three times. Goldfish fry weighing 3.23±0.00 g were reared in nets measuring 2 x 1 x 1 m3 and a water level of 50 cm with a density of 50 fish m-3. Fish kept for 60 days. The results showed that the administration of thymol increased the growth performance of fish, which included specific growth rate, final weight, protein efficiency ratio and feed conversion ratio. Giving thymol at 0.4% in feed resulted in maximum growth performance values in carp. On the other hand, the survival value of fish increases with increasing levels of thymol in the feed. From this study it can be concluded that the optimal dose of adding thymol in feed for carp is 0.4%.
Keyword: Carp, fish, growth, thymol

Judul: Effectiveness of Commercial Astaxanthin Supplementation in Feed on the Growth Performance of Common Carp Cyprinus carpio
Abstrak: Ikan mas termasuk salah satu ikan dengan laju pertumbuhan yang cukup tinggi. Astaxanthin adalah antioksidan dari golongan karotenoid yang dapat mempengaruhi pertumbuhan ikan. Penelitian ini bertujuan mengevaluasi efektivitas suplementasi astaxanthin komersial pada pakan terhadap kinerja pertumbuhan ikan mas (Cyprinus carpio). Penelitian menggunakan empat perlakuan dan tiga ulangan, yaitu K (0 mg kg-1 pakan), L50 (50 mg kg-1 pakan), L100 (100 mg kg-1 pakan), dan L150 (150 mg kg-1 pakan). Ikan dipelihara dengan kepadatan 12 ekor per akuarium selama 60 hari. Pemberian pakan uji dilakukan secara at satiation dengan frekuensi sebanyak tiga kali sehari, yaitu pukul 08.00, 12.00, dan 16.00. Parameter yang diamati yaitu laju pertumbuhan spesifik, tingkat kelangsungan hidup, rasio konversi pakan, jumlah konsumsi pakan, retensi protein, retensi lemak, rasio efisiensi protein, dan feed cost per gain. Suplementasi astaxanthin komersial pada pakan menunjukkan kinerja pertumbuhan yang berbeda nyata (p<0,05) antar perlakuan. Kinerja pertumbuhan ikan mas (Cyprinus carpio) terbaik diperoleh pada pakan dengan penambahan astaxanthin komersial sebanyak 100 mg kg-1 pakan., Common carp is one of the fish with a fairly high growth rate. Astaxanthin is a carotenoid antioxidant which can affect fish growth. This study aims to evaluate the effectiveness of commercial astaxanthin supplementation in feed on the growth performance of common carp (Cyprinus carpio). The research used four treatments and three replications, namely K (0 mg kg-1 feed), L50 (50 mg kg-1 feed), L100 (100 mg kg-1 feed), and L150 (150 mg kg-1 feed). Fish were maintained at a density of 12 fish per aquarium for 60 days. The test feed was given at satiation with a frequency of three times a day, namely at 08.00, 12.00 and 16.00. The parameters observed were specific growth rate, survival rate, feed conversion ratio, amount of feed consumption, protein retention, fat retention, protein efficiency ratio, and feed cost per gain. Astaxanthin commercial supplementation in feed showed significantly different growth performance (p<0.05) between treatments. The best growth performance of common carp (Cyprinus carpio) was obtained with feed supplemented with 100 mg kg-1 of commercial astaxanthin.
Keyword: Astaxanthin, Growth, Common carp, Feed

Judul: Urban risk analysis based on earthquake hazar vulnerability area in Bantul Regency
Abstrak: The aim of the research is to determine the area of hazard, vulnerability, and risk based on the occurrence of the earthquake in Bantul regency. The method used is a multicriteria analysis to generate the weight of each criterion, while the geographic information system (GIS) used to perform spatial analysis. Four hazard, criteria namely lithology (rock structure), the intensity of seismicity, slope, and the fault lines with weighted linear combination method produces some regions with low stability category, which is located in District Imogiri, Pleret, Pundong, Kretek, Sanden, Srandakan, Jetis, and Dlingo. Generally, an area with low stability is located right near Opak’s fault lines. The three main criteria in vulnerability analysis used to assess; the physical, demography, and social aspects. The analysis of the level of vulnerability used the pairwise comparison method to weighting criteria and sub criteria. Vulnerability analysis results show that the physical aspect (0794) is the most influential aspect in the assessment vulnerability level, followed by aspects of demography (0179) and social aspects (0071). The result of total vulnerability assessment includes three aspects: physical, demographic, and social show Bantul District (0886) is the area most vulnerable to earthquake occurrence. Assessment of risk level is a combination of hazard and vulnerability levels showed that nearly 45% of the study area included in the category of risk is very high and extreme. Other results showed nearly 40% of settlement area in the study area into high-risk category of settlement, or settlements with the probability of damage and high casualties if of disaster.
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