The aims of this study were to determine clinical symptoms, mortality, prevalence, and histopathology of Cantang hybrid grouper fish infected with Oodinium sp. on the Cantang. The study was conducted by direct observation of clinical symptoms, calculating the number of fish mortality, and measuring the quality of water in the tank using the Cantang. While histopathology was conducted in the laboratory using 10 samples of sick fish with an average total length of 10.6 ± 0.69 cm and a weight of 18.6 ± 1.77 g. The results showed that the fish seen swimming weakly on the surface of the water near aeration or standing still at the bottom of the tub, decreased appetite, had pale or darker body color, and were thin. Observation of skin and gill mucus under a microscope showed the presence of ectoparasites Oodinium sp. in massive quantities in almost every gill sheet. The mortality of fish infected with Oodinium sp. in the Cantang of 26.84±3.9%, with a prevalence of 49.59%. Histopathologically the gill lamellae of fish infected with Oodinium sp. shows the occurrence of hyperplasia which causes the union of several gill lamellae.
Penelitian studi pemetaan potensi bambu laut (Isis sp) merupakan bagian dari program konservasi bambu laut yang dilaksanakan di kawasan Lovina, Bali. Kegiatan saat ini bertujuan untuk memetakan potensi bambu laut (Isis sp) hidup untuk dijadikan produk budidaya yang bernilai ekonomi tinggi. Lokasi penelitian di Kawasan Perairan Lovina, Kabupaten Buleleng Bali pada Bulan Juni 2021 sampai Juni 2022. Metode yang digunakan Manta Tow survey, Line Transect dengan pencatatan jumlah koloni pada daerah reef flat dan reef slope. Perairan Lovina memiliki potensi bambu laut (Isis sp) yang ditemukan di semua stasiun penelitian, dengan rincian: Stasiun 1 dengan kelimpahan 255 koloni / 500 m2 dalam kategori melimpah dan Stasiun 2 dengan 17 koloni dan Stasiun 3 dengan 25 koloni dalam kategori jarang.
Air merupakan media budidaya yang sangat penting dalam perikanan, seiring berjalannya waktu, ketersediaan air bersih semakin sulit untuk didapat, sehingga menjadi kendala dalam berbudidaya, dengan menggunakan sistem resirkulasi akan memutar air secara terus menerus sehingga mampu menghemat air dan kualitas air tetap terjaga. Adapun kualitas air yang dapat mempengaruhi ikan lele yakni, Amonia, Nitrit dan Nitrat. Sistem resirkulasi menggunakan filter dengan perbandingan menggunakan filter konvensional dan filter konvensional yang diambah dengan filter biologi menggunakan tanaman kangkung. Tujuan dari penelitian ini untuk melihat apakah terdapat perbedaan konsentrasi amonia, nitrit, dan nitrat dari sistem resirkulasi yang tidak menggunakan tanaman dengan sistem resirkulasi yang menggunakan tanaman kangkung serta melihat sistem mana yang lebih efektif dalam memperbaiki kualitas air. Pengambilan sampel air dilakukan 7hari sekali selama 1bulan. Parameter yang diamati adalah Amonia, nitrit, nitrat. Data disajikan dalam bentuk grafik serta dianalisis secara deskriptif kuantitatif. Amonia dan nitrit perakuan A, nilai rata-rata yang diperoleh cenderung lebih tinggi dibanding dengan perlakuan B namun rata-rata masih berada di bawah ambang batas yang telah ditentukan, sedangkan konsentrasi nitrat menunjukkan nilai yang tinggi pada perlakuan B dibandingkan perlakuan A. Terdepat perbedaan kualitas air dari kedua perlakuan, kualitas air perlakuan B lebih baik dilihat dari variabel amonia nitrit dan nitrat dengan menghasilkan SR tertinggi sebanyak 86,6%.
Problems in the fish hatchery sector often occur such as high egg mortality or low quality of fish eggs. Optimizing biosecurity is one of the efforts to improve the quality of fish eggs, for example by adding disinfectants such as iodine, ozone, and peracetic acid. The use of chemical disinfectants will produce good results if the right dose, time, and commodity are used. In this study. This research aims (1) to determine whether the use of chemicals including iodine, ozone, and peracetic acid had an effect as a disinfectant to increase the hatching rate of grouper fish, (2) to determine the level of effectiveness and efficiency of the use of chemicals as a disinfectant. This research is an experimental research type. The research subjects included in the study were cantang grouper fish eggs at PT. Pakarti Daksa Segara who used the exploratory sampling method. The conclusion of this study indicates that there is an influence on the growth rate of the use of iodine, ozone and, peracetic acid chemicals as disinfectants of cantang grouper eggs and there is a comparison of the effectiveness and efficiency of the use of the three chemicals which includes the percentage of the hatching rate, the cost of the disinfectant material and the time, which is needed in the use of the disinfectant. Iodine has the best level of effectiveness from the comparison of hatching eggs of cantang grouper and peracetic acid is the most efficient type of chemical.
Kawasan Pesisir Kecamatan Buleleng terdiri dari Pantai Desa Kalibukbuk, Anturan, Tukad Mungga, Pemaron, Baktiseraga, Banyuasri, Kaliuntu, Kampung Anyar, Kampung Bugis, Kampung Baru, Banyuning, dan Penarukan merupakan kawasan perairan yang berada di pusat Kabupaten Buleleng. Perairan Kecamatan Buleleng memiliki karakteristik subsrat perairan berupa hamparan terumbu karang, patahan karang, pasir yang didominasi oleh pasir hitam, dan berlumpur. Kondisi subsrat memiliki potensi pengembangan wisata muck dive sebagai alternatif wisata bahari yang berkelanjutan. Muck dive merupakan jenis penyelaman yang dilakukan di subsrat berlumpur dengan berfokus untuk menemukan jenis langka dan samar yang jarang ditemukan di terumbu karang. Penelitian bertujuan mengetahui potensi muck dive dengan memperkuat data identifikasi jenis, kelimpahan dan keanekaragaman organisme yang dapat dijadikan sebagai ikon obyek wisata selam. Peneltian menggunakan metode underwater visual sensus dengan mengikuti line transect. Penelitian menunjukkan Perairan Kecamatan Buleleng memiliki potensi pengembangan wisata muck dive dengan karakteristik di setiap perairan desa yang beragam berdasarkan tipe subsrat perairan. Kelimpahan dan keanekaragaman jenis organisme sebagai obyek muck dive tertinggi terdapat di Pantai Desa Baktiseraga, Banyuasri, dan Kaliuntu, sedangkan terendah di Desa Kampung Anyar, Kampung Bugis, Kampung Baru, Banyuning, dan Penarukan. Potensi wisata muck dive layak dikembangkan sebagai alternatif wisata bahari yang dikelola secara berkelanjutan. The coastal area of Buleleng districts consists of Kalibukbuk, Anturan, Tukad Mungga, Pemaron, Baktiseraga, Banyuasri, Kaliuntu, Kampung Anyar, Kampung Bugis, Kampung Baru, Banyuning, and Penarukan are water areas located in the center of Buleleng Regency. The Buleleng districts water have the characteristics of the water substrate in the form of coral reefs, coral fractures, sand dominated by black sand, and muddy. Substrate conditions have the potential to increase muck dive tourism as an alternative to sustainable marine tourism. Muck dive is a type of diving that is carried out in muddy substrates with a focus on finding rare and rare species that are rarely found in coral reefs. This study aims to determine the potential of muck dive by strengthening the identification data of species, abundance and diversity of organisms that can be used as icons of diving tourism objects. The research uses the underwater visual census method by following the line transect.The research shows that the Buleleng districts waters have the potential to develop muck dive tourism with different characteristics in each village waters based on the type of substrate. The highest abundance and diversity of organisms as muck dive objects was found in Baktiseraga, Banyuasri, and Kaliuntu Beaches, while the lowest was in Kampung Anyar, Bugis, Kampung Baru, Banyuning, and Penarukan villages. This potential to be the one of alternative for marine tourism which is must managed sustainably.
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