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Dissolved oxygen is the parameters key of water quality. Low level of dissolved oxygen can affect the function and slow growth, can even cause death to fish in hypoxia condition. The aims of this experiment were to determine the effect of population density of Daphnia spp. of dissolved oxygen concentration and the correlation between dissolved oxygen concentration with color scoring of Daphnia spp. This method was experimental with Completely Randomized Design as experiment design with 6 treatments and 4 replications. The treatment that was given were the differences of Daphnia spp. density that consisted of treatment A (50 individu/200 ml), treatment B (250 individu/200 ml), treatment C (450 individu/200 ml), treatment D (650 individu/200 ml), treatment E (850 individu/200 ml), and treatment F (1050 individu/200 ml). The results showed that the difference of Daphnia spp. density showed highly significant effect of dissolved oxygen concentration of treatment medium (p<0,01). In addition, this experiment also showed that the dissolved oxygen concentration in treatment medium showed negative correlation with color score of Daphnia spp.

AbstrakTeknologi akuaponik merupakan teknologi kombinasi akuakultur dan hidroponik yang bertujuan untuk memelihara ikan dan tanaman dalam satu sistem yang saling terhubung (Sibarani, 2013). Limbah yang dihasilkan oleh ikan seperti feses dan pakan, digunakan sebagai pupuk untuk tanaman. Kemudian air yang dialirkan dari media pemeliharaan dibersihkan olah tanaman sehingga dapat digunakan kembali oleh ikan (Wahap,2010). Menurut Rokocy (2010) interaksi antara ikan dan tanaman menghasilkan lingkungan yang ideal untuk tumbuh sehingga lebih produktif dari metode tradisional.Tujuan penelitian ini adalah untuk mengetahui pengaruh media tanam terhadap pertumbuhan belut (Monopterus albus) dalam sistem akuaponik. Penelitian ini dilakukan pada bulan Agustus sampai September 2016 di Fakultas Perikanan dan Kelautan Universitas Airlangga. Percobaan terdiri dari empat perlakuan dan lima ulangan, tanpa media tanam sebagai kontrol ( P0), media tanam zeolit (P1), media tanam batu apung (P2) dan media tanam pecahan batu bata (P3). Hasil pengamatan yang didapatkan dari penggunaan teknologi akuaponik dengan media tanam selada terbaik yang dapat mempengaruhi pertumbuhan belut yaitu media tanam zeolit. Pada pengamatan menunjukkan laju pertumbuhan spesifik dengan media tanam zeolit (1,19%/hari), kelulushidupan belut dengan media tanam zeolit (70%), Penambahan tinggi selada pada media tanam zeolit ( 11,39 cm), dan kandungan amonia terendah pada media tanam zeolit pada hari ke-28 (0,03 mg/L). AbstractAquaponics is the combination of aquaculture and hydroponic technology which aim to raise fish as well as grow the plants in an interconnected system (Sibarani, 2014). The wastes that are produced by fish such as feces and feed are used as plants fertilization. The water that is flowed from media culture will be filtered by the plants so that could be reused by fish (Wahap, 2010). According to Rokocy (2010) the interaction between fish and plants will creates an ideal environment for them to growing compared to the traditional method. The objective of this research is to find out the effect of cultivation media on the eel (Monopterus albus) growth in the aquaponics. This research was conducted at August until September 2016 at Fishery and Marine Faculty of Airlangga University. The experiments consisted of four treatments in five repetitions. The P0 was the treatment without cultivation media as control treatment, P1 was the treatment using zeolite, P2 was the treatment using pumice stone, P3 was the treatment using brickbat.Observations obtained from the use of technology aquaponics with the best lettuce planting medium that can affect the growth of eels that zeolite planting medium. In observation indicates the specific growth rate with planting medium zeolite (1.19%), survival rate of eel with planting medium zeolite (70%), high additions to the growing media lettuce zeolite (11.39 cm), and the lowest ammonia content of the growing media zeolite on the 28th day (0.03 mg /L). PENDAHULUANBelut merupakan salah satu produksi perikanan yang memil...

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This research was conducted to discover Vibrio harveyi infected vannamei shrimp with White Feces Disease (WFD) in Situbondo, East Java Province. This research was conducted in November 2017 until September  2018. All Vibrio isolates from shrimp infected WFD were identified with biochemical tests, Analytical Profile Index/ API 20NE (BioMeriuex), and PCR with specific primers for V. harveyi. Additional parameters were the water quality, plankton brackishwater pond abundance, and antibiotic resistance test. Result showed that from 17 bacterial isolates identified, 10 isolates were V. harveyi (58.82%), three isolates were V. alginolyticus (17.65%), one V. fluvialis isolate (5.88%), one V. parahaemolyticus isolate (5.88%), and two non Vibrio isolates which were identified as Shewanella putrefaciens (11.76%). All isolates of V. harveyi also showed resistance activity on more than one antibiotic. Poor water quality had been identified as abnormal result of pH, alkalinity, salinity, ammonia levels and total organic matter level. Plankton abundance observation showed that Chloropyceae, Diatom, and Dinoflagellata dominated all sampled brackishwater ponds. This research concluded that V. harveyi were discovered on vannamei shrimp with poor water quality and plankton abundance in the pond samples.