Semah fish (Tor douronensis) is a kind of freshwater fish pertained as a wild fish that almost extint and rare, therefore, it is necessary to preserve through the culture activity. Meanwhile, in fish culture effort, feed is considers as an important factor. Thus, feed must meet a proper quality and quantity due to the fish maintenance, growth, and reproduction requirement. Test feed employed in this research was an artificial feed in form of pellet which was consists of 40% protein by dose tested of 3%, 6%, 9% and 12% of biomass weight. The result indicated that daily growth rate was ranged between 1.44-1.99% by highest growth achieved at feed dose 6% and from the quadratic regression analysis achieved optimal dose by 6.18%. Daily feed comsumption rate of semah fish seed was ranged between 2.69-10.19% per day. Feed efficiency was ranged between 13.85-54.09%, and survival rate was 100%.
<p>Recirculating aquaculture system (RAS) is one of aquaculture systems that aimed at providing good water quality as fish culture medium. The objective of this study was to examine the effect of water exchange rate in RAS on the growth and survival of <em>Collosoma</em> sp. Four different water exchange rates were tested, i.e. 0.003 ℓ/s, 0.005 ℓ/s, 0.008 ℓ/s, and 0.010 ℓ/s. <em>Collosoma</em> sp. larvae was stocked at a density of 50 fish/ℓ in plastic jar with a volume of 4ℓ. The observation showed that water exchange rate of 0.005 ℓ/s resulted in the best survival and growth.</p> <p>Key words: Circulating system, <em>Collosoma</em> larvae, water exchange rate, growth, survival</p> <p> </p> <p>ABSTRAK</p> <p>Akuakultur sistem sirkulasi merupakan salah satu sistem budidaya yang bertujuan untuk menyediakan kualitas air yang baik sebagai media pemeliharaan ikan. Tujuan penelitian ini adalah untuk mempelajari pengaruh laju pergantian air terhadap kelangsungan hidup dan pertumbuhan larva ikan bawal Collosoma sp. Perlakuan meliputi empat laju pergantian air yang berbeda yaitu, 0,003 ℓ/detik; 0,005 ℓ/detik; 0,008 ℓ/detik; and 0,010 ℓ/detik. Larva ikan bawal kemudian ditebar dalam stoples plastic dengan volume 4ℓ dengan kepadatan 50 ekor/ℓ. Hasil penelitian menunjukkan bahwa laju pergantian air sebanyak 0,005 ℓ/detik memberikan kelangsungan hidup dan pertumbuhan ikan bawal terbaik.</p> <p>Kata-kata kunci: Sirkulasi, larva ikan bawal, laju pergantian air, pertumbuhan, kelangsungan hidup</p>
A brine shrimp toxic compound has been isolated from Mangifera foetida L. steam bark. Based on spectroscopic data (IR, 1 H-NMR, 13 C-NMR 1D and 2D), the structure of this compound was identified as mangiferenes B, C 30 H 47 O 2 . In this study, the n-hexane, ethyl acetate, methanol extracts and isolated compound showed toxic effects (LC 50 471.9543; 534.5209, 678.4421, and 22.1615 µg/mL, respectively). The toxicity degree among the three extracts and isolated compound is isolated compound > n-hexane extract > ethyl acetate extract > methanol extract.
The type of research used is Classroom Action Research (CAR). The purpose of this classroom action research (CAR) is to find out how far science students' learning outcomes are increased by applying the use of Power Point Media. In class action research (PTK) this was carried out in 2 cycles, from the results of the actions taken it was proven to be able to improve student learning outcomes by achieving the specified classical completeness of 85%. Classical Completeness 70% obtained in cycle I, can be increased in cycle II to 100%. In terms of student activity there was also an increase, namely in cycle I, the moderately active category was obtained, increasing to the active category. The results of this action research indicate that the application of the use of Power Point Media can improve student learning outcomes in science lessons with completeness reaching 100%.
<p>Fish requires essential fatty acid for growth. Freshwater fish needs linoleat fatty acid (n-6) or combination of linoleat and a-linolenat acids (n-3). Fish oil contains higher level of n-3, corn oil is rich of n-6, while coconut oil is rich of saturated fatty acids. This study was conducted to determine the effect of fatty acid sources in diet on growth performance of botia <em>Botia macracanthus</em>. Sources of fatty acid examined were coconut oil (control), corn oil, fish oil, and corn oil + fish oil + coconut oil. The results of study show that daily growth rate of fish fed on diet containing mix of corn-coconut-fish oils (8.39%) and only corn oil (8.15%) was higher (p<0.05) compared to that of fish fed on diet containing fish oil (7.67%) and coconut oil (6.62%). Feed conversion rate of fish fed on diet containing mix of corn-coconut-fish oils (2.12%) and only corn oil (2.34%) was lower (p<0.05) than that of fish fed on diet containing fish oil (2.97%) and coconut oil (3.74%). Growth rate and feed conversion rate of fish fed on diet containing mix of corn-coconut-fish oils and only corn oil was similar (p>0.05). Survival rate of fish at all treatments was similar, ranged from 90.00 to 93.33%. Thus, the results suggested that diet containing only corn oil is suitable for botia to obtain higher growth rate and lower feed conversion rate.</p> <p>Keywords: fatty acid, growth performance, botia, <em>Botia macracanthus</em></p> <p><br /> ABSTRAK</p> <p>Ikan membutuhkan asam lemak essensial (EFA = Essential Fatty Acid) untuk pertumbuhannya. Ikan air tawar memerlukan asam lemak linoleat (<em>n</em>-6) atau gabungan asam lemak linoleat (n-6) dan alfa-linolenat (n-3). Minyak ikan banyak mengandung asam lemak <em>n</em>-3, minyak jagung kaya akan asam lemak n-6, sementara minyak kelapa banyak mengandung asam lemak jenuh. Sumber asam lemak yang diuji adalah minyak kelapa (kontrol), minyak jagung, minyak ikan, dan minyak jagung + minyak ikan + minyak kelapa. Hasil penelitian menunjukkan bahwa laju pertumbuhan harian ikan botia yang diberi pakan yang mengandung campuran minyak jagung-kelapa-ikan (8,39%) dan minyak jagung (8,15%) saja lebih tinggi (p<0,05) daripada yang diberi pakan mengandung minyak ikan (7,67%) dan minyak kelapa (6,62%). Nilai konversi pakan pada ikan yang diberi pakan mengandung minyak jagung-kelapa-ikan (2,12%) dan minyak jagung (2,34%) lebih rendah (p<0,05) dibandingkan dengan yang diberi pakan mengandung minyak ikan (2,97%) dan minyak kelapa (3,74%). Pertumbuhan dan konversi pakan pada ikan yang diberi pakan mengandung campuran ketiga minyak dan hanya minyak jagung adalah tidak berbeda (p>0,05). Kelangsungan hidup ikan pada semua perlakuan relatif sama, yaitu berkisar antara 90,00-93,33%. Dengan demikian, pakan untuk ikan botia cukup mengandung minyak jagung saja untuk mendapatkan laju pertumbuhan yang tinggi dengan konversi pakan yang rendah.</p> <h2>Kata kunci: asam lemak, kinerja pertumbuhan, ikan botia, <em>Botia macracanthus</em></h2>
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