No abstract

Arang aktif merupakan karbon amorf yang memiliki kemampuan daya serap yang baik sehingga sering dimanfaatkan sebagai campuran penghilang zat warna, penyerap gas, penyerap logam berat, adsorben bahan organik maupun anorganik. Penelitian ini bertujuan untuk menganalisis pengaruh penambahan arang aktif kulit durian terhadap kualitas air pada budidaya ikan koi. Metode pembuatan arang aktif menggunakan perlakuan fisika dan kimia dengan menggunakan aktivator KOH. Parameter yang diukur dalam Analisa kualitas air budidaya ikan koi meliputi suhu, TDS, pH, O2, dan NH3. Arang aktif kulit durian dapat mempengaruhi kualitas air pada budidaya ikan koi yaitu dengan melihat penurunan kadar dan peningkatan kadar pada air budidaya ikan koi. Adapun kondisi optimum pemberian arang aktif diperoleh dengan konsentrasi aktivator sebesar 25%. Hasil penelitian menunjukkan semakin besar konsentrasi aktivatornya, maka akan meningkatkan nilai TDS dan menurunkan kadar O2 dalam air sehingga jumlah kematian ikan koi meningkat karena kurangnya pasokan oksigen dalam air. Pengaruh variasi konsentrasi waktu perendaman arang aktif akan mempengaruhi jumlah kematian ikan koi dalam air.   Kata Kunci: Arang Aktif, Kulit Durian, Kualitas Air

The increase of the growth performance and control of disease can be done by the use of imunostimulan. Immunostimulant is a material that capable of increasing the non-specific immune response of fish. The purpose of this study was to determine the best concentration of immunostimulants in self-formulated pellet feed on the growth performance and immune response of silver pompano fingerling. The immunostimulant content used it was sourced from commercial products Nutricell. There was three concentrations of imunostimulan were used in this study, namely 0.3% (treatment A), 0.5% (treatment B), and 0,0% (treatment K) and one group fish fed with commercial feed as the control and a comparison (treatment P). A total of 840 silver pompano fish seeds with an average initial body weight of 11,13± 1,39 g were kept in 12 cages (0.8 x 0.8 x 0.6 m3) for 30 days. The results showed that the provision of feed supplements containing commercial immunostimulants did not significantly affect the growth rate, The feed conversion and survival rate but produced the highest total leukocyte count of 65,775. x 10. cells/ml and 35.10% phagocytosis rate achieved on the 30th day of treatment. The results of the five-day challenge test showed that treatment A which was the addition of 0.3% immunostimulant feed had lower mortality than other treatments, after being injected with Vibrio alginolyticus bacteria at a dose of 3 x 109 cfu/ml/0.002 g/head fish weight. Based on the results above, it can be concluded that the formulated feed in treatment A which was added with immunostimulant 0.3% (0.7% total in the feed formula) showed a higher survival performance in the nursery phase of silver pompano fish compared to other treatments.

This study aimed to know the effect of different feedings on growth performance, physiological responses, and behavioral changes of juvenile spiny lobsters. The experimental method used a completely randomized design with three treatments and four replications. There were three different feeds used as treatment, namely: flesh mussel (K), commercial fish feed (I), and commercial shrimp feed (U). Feed is given as much as 30% of body weight, five times per day at 6:30 am, 12:00 pm, 4:00 pm, 9:00 pm, and 2:00 am. The results showed that the commercial feeding of fish (I) significantly (P<0.05) increased the survival rate and biomass of spiny lobster for 54.17% and 141.7 g, respectively. While fresh mussel give better growth and stress response, but had the lowest survival rate. The results of the physiological response test of lobster were more effective in suppressing lobster stress levels than other treatments (P<0.05). The behavior of juvenile spiny lobsters showed a very striking color difference and reflex impairment scores, which indicated that the vitality of the treated juveniles (I) was better than the vitality of the treatments (K) and treatment (U). This study shows that commercial fish feed (I) is recommended for maintaining spiny lobsters in the juvenile phase, although it needs further maintenance by using an appropriate feed formulation to improve the growth performance of spiny lobsters.