Ikan padi Oryzias javanicus adalah spesies yang euryhaline, mudah dipelihara, dan dikembangbiakkan sehingga dapat menjadi ikan model untuk penelitian di laboratorium. Ikan ini juga memiliki potensi sebagai ikan hias untuk akuaskap. Budidaya ikan O. javanicus belum populer sehingga pengadaan ikan ini mengandalkan hasil tangkapan alam. Ikan liar hasil tangkapan alam membutuhkan adaptasi di dalam wadah terkontrol. Salah satu faktor yang mempengaruhi performa adaptasi awal yaitu kepadatan ikan selama pengangkutan sistem tertutup. Kondisi yang terlalu padat berdampak pada performa adaptasi ikan yang kurang baik. Oleh karena itu, penelitian ini bertujuan untuk mengkaji performa adaptasi O. javanicus selama pemeliharaan pascapengangkutan. Performa berkaitan dengan sintasan, tingkah laku, dan jumlah telur selama 15 hari pemeliharaan. Kepadatan ikan yaitu 24 ekor/L (perlakuan A) dan 40 ekor/L (perlakuan B) yang dikemas selama 6 jam. Hasil penelitian menunjukkan bahwa pengangkutan ikan O. javanicus dapat dilakukan dengan kepadatan 40 ekor/L selama 6 jam. Kepadatan tersebut menghasilkan sintasan saat pengangkutan yaitu 100%, sintasan selama pemeliharaan pascapengangkutan yaitu 92,00%, tingkah laku adaptasi yang baik, sehingga menghasilkan total telur 522 butir selama 15 hari pemeliharaan. Kata kunci: adaptasi pascapengangkutan, Oryzias javanicus, sintasan, tingkah laku adaptasi

Abstract. This study aimed to investigate the effect of the administration of rice washing water in culture medium on the growth performance of Daphnia sp. This research using three different doses of rice washing water i.e 1 mL/L, 3mL/L, and 5 mL/L. Daphnia sp. was cultured with an initial density of 20 ind/L. Observed parameters include growth parameters (population density, size and specific growth rate) and water quality. This result showed that a concentration of 3 mL/L created the highest population of Daphnia sp. density about 620±20 ind/L, number small size (young stage) 81.2%, and the highest specific growth rate about 56.68±0.55%. The water quality content of  DO, temperature and pH during this study were in the good range of Daphnia sp. life and reproduction. The research has a conclusion that rice washing water can be used to nutritional sources of Daphnia sp. In the future, it is necessary to make further observations about the reproductive performance of Daphnia sp, given rice washing water through clone culture.Keywords: Live food, Population density, Rice washing water, Size of Daphnia sp., Specific growth rate

Information on the biometric characteristics, egg morphology, and habitat of O. javanicus are very important for its use as model fish in the laboratory, ornamental fish, and environmental bioindicators. Therefore, research is needed to analyze the biometric character, egg morphology, and habitat of ricefish O. javanicus in the brackish water pond of Banten Bay. This research was conducted non-eperimentally by observing biometric characters to examine meristic, morphometric, and sex dimorphism characteristics. Observations of egg morphology were macroscopic and microscopic characteristics. Habitat characteristics were observed by measuring water quality in situ. The results showed that O. javanicus from Linduk had meristic characteristics D.6–7; A.21–22; P.9-10; V.5–6 and sex dimorphism in the shape and size of the dorsal and anal fins. Blue metallic color pattern on the head and yellow color on the fins are potentially ornamental fish. O. javanicus eggs have a diameter of 1.08 ± 0.02 mm, are equipped with attaching filaments and non-attaching. The non-attaching filaments are 0.14 ± 0.03 mm in length. The percentage of yolk area was 73.7 ± 4.85%, and the oil droplet area was 8.3 ± 0.54% of O. javanicus at the gastrula stage with egg yolk volume 0.349 ± 0.048 mm3. Water quality in this study is a reference for rearing O. javanicus in the laboratory.

The purpose of this research is to evaluate the effect of different concentration of Spirulina platensis supplementation on artificial feed for zebrafish (Danio rerio) to increase growth performance and immunity from environmental pressure. The experimental research was carried out from October until November 2020. The purpose of this research is to evaluate the effect of S. platensis different concentration supplementation on artificial feed for zebrafish (Danio rerio) to increase growth performance and immunity from environmental pressure. The experimental research was carried out from October 2020 until November 2020 at Aquaculture Laboratory, Universitas Sultan Ageng Tirtayasa, Serang, Banten. This research used a complete randomized design (CRD) consisted of 4 treatments and 3 replications. Control was commercial pellet which no S. platensis enriched (A), pellet enriched with 3% of S.platensis (B), pellet enriched with 6% of  S. platensis(C), and last treatment were pellet enriched with 9% of  S.platensis (D). The results showed that treatment C was the best dosage of S. platensis for zebrafish rearing for 40 days both growth and immunity performance. Absolute length, Specific growth rate of length, Absolute weight, Specific growth rate of weight were significantly different, but survival rate were not significantly different which were 0.646±0.112g, 0.714±0.10g, 0.102±0.020%, 1.422±0.215%, 100% respectively. Immunity performance was shown by the stress test at low pH. It was also significantly different when exposed to pH at 5 ppt among the treatment. Treatment C was the highest survival rate which was 63.33±5.77% after stress test at low pH.

Rehabilitasi karang di Pulau Tunda dilakukan untuk mendukung wisata bahari yang menjadi andalan sektor pariwisata masyarakat. Karena itu, Program Kreativitas Mahasiswa (PKM) yang dilakukan yaitu pengabdian pada masyarakat (PM) berkaitan dengan transplantasi karang berbasis fishdom. Kegiatan ini adalah pembuatan terumbu karang buatan yang bertujuan untuk memulihkan ekosistem bawah laut, populasi dan keanekaragaman ikan. Keberhasilan program tersebut dimulai dari pemilihan lokasi dan adanya partisipatif masyarakat yang dapat diperoleh melalui pengetahuan masyarakat. Berdasarkan hal tersebut maka tujuan kegiatan untuk memperoleh informasi pengetahuan masyarakat tentang karang dan ekowisata bahari serta rekomendasi dari masyarakat tentang pelaksanaan transplantasi karang dan lokasi PKM-PM di Pulau Tunda. Tahapan kegiatan yaitu perencanaan, pengumpulan data di masyarakat, dan analisis data. Koordinasi dilakukan dengan pemerintah setempat dan kelompok sadar wisata (Pokdarwis). Pengumpulan data dilakukan melalui wawancara non-formal ke perwakilan masyarakat di 2 RW 6 RT di Desa Wargasara Pulau Tunda. Hasil wawancara menunjukkan bahwa lebih dari 50% masyarakat Pulau Tunda memiliki pengetahuan yang baik tentang terumbu karang dan fungsinya, transplantasi karang, kondisi terumbu karang, lokasi ikan dan ekowisata di Pulau Tunda. Lebih dari 60% masyarakat Pulau Tunda belum mengetahui struktur fishdom dan belum pernah mengikuti sosialisasi serta pelatihan tentang transplantasi karang. Oleh karena itu masyarakat menyarankan perlu dilakukan pelatihan transplantasi karang dan pembuatan fishdom di Pulau Tunda. Masyarakat menyarankan transplantasi karang dapat dilakukan di Tanjungan Timur dan  penempatan fishdom di Pantai Utara untuk mendukung wisata bawah air di Pulau Tunda. Pelibatan masyarakat, terutama Pokdarwis dapat menjamin keberlanjutan kegiatan PKM-PM yang dilakukan di Pulau Tunda melalui wisata berbasis edukasi konservasi karang.