International legal aspects of the status and activities of marine fish farming vessels

The article provides information on a new type of marine vessels aimed at artificial fish farming in the sea, the construction of which is underway in a number of states. The operation of such vessels can be a huge breakthrough in the development of mariculture. The author proposed to call it “marine fish farming vessels”. The legal status of such vessels in accordance with the current international law are analyzed. The legal aspects of the use of marine fish farming vessels in the World Ocean are considered. Possible legal problems associated with the absence in Russian legislation of provisions on the status and activities of marine fish farming vessels in the Russian Federation are assessed.

The Effectiveness of Seaweeds as Biofilter for Reducing Wastewater Nutrient and Preventing Water Pollution from Hybrid Grouper Culture

Highlight ResearchWastewater in hybrid grouper culture should be maintain before resirculate and dispose to aquatic environment to avoid eutrophication.Seaweed that is used for biofilter must be observed for its suitability, performance and effectivity.Ulva sp. has the best effectiveness to reduce nutrient in wastewater of hybrid grouper aquaculture by absorbing then stored into thallus.Ulva sp. is proven has the best SGR and adaptability in wastewater of hybrid grouper culture.AbstractWastewater generated from hybrid grouper culture needs to be managed to improve water quality before being recirculated, or discharged in the aquatic environment. Seaweed biofilter has been proposed in wastewater treatment technology for marine fish farming. This study aimed at comparing which of these species i.e. Ulva sp., Sargassum sp., Gelidium sp., and Dictyota sp. work best to absorb nutrient wastewater hybrid grouper culture. This research utilized these seaweed as treatments and controls with three replications using Completely Randomized Design. A statistical analysis was conducted to investigate the significant differences in the nutrient absorptions among various seaweed species by using ANOVA and least significant difference. Non-parametric tests namely Kruskal-Walis, Mann-Whitney, and t-test were used with confidence interval of 95%. The results revealed that Ulva sp. has the best ability to reduce the Nitrogen 80%, while Dictyota able to reduce Phosphor 88% by Dictyota sp. generated from wastewater of hybrid grouper culture. While the highest absorbtion of Total Kjeldahl Nitrogen (104%) and phosphate (182%) that stored in thallus were performed by Ulva sp. Ulva sp. had the best performance and highest growth rate (1.9% d-1) as biofilter in hybrid grouper cultivation than other species.

Challenges and Solutions to Viral Diseases of Finfish in Marine Aquaculture

Aquaculture is the fastest food-producing sector in the world, accounting for one-third of global food production. As is the case with all intensive farming systems, increase in infectious diseases has adversely impacted the growth of marine fish farming worldwide. Viral diseases cause high economic losses in marine aquaculture. We provide an overview of the major challenges limiting the control and prevention of viral diseases in marine fish farming, as well as highlight potential solutions. The major challenges include increase in the number of emerging viral diseases, wild reservoirs, migratory species, anthropogenic activities, limitations in diagnostic tools and expertise, transportation of virus contaminated ballast water, and international trade. The proposed solutions to these problems include developing biosecurity policies at global and national levels, implementation of biosecurity measures, vaccine development, use of antiviral drugs and probiotics to combat viral infections, selective breeding of disease-resistant fish, use of improved diagnostic tools, disease surveillance, as well as promoting the use of good husbandry and management practices. A multifaceted approach combining several control strategies would provide more effective long-lasting solutions to reduction in viral infections in marine aquaculture than using a single disease control approach like vaccination alone.

PEMANFAATAN IKAN RUCAH ZERO WASTE SEBAGAI PAKAN DALAM PEMELIHARAAN IKAN KUWE DI KERAMBA JARING APUNG DUSUN WAEL KABUPATEN SERAM BAGIAN BARAT

Feed stands a significant factor in determining the success of a cultivation business. One type of feed used in marine fish farming is trash fish. The objectives of this study were 1) to determine the growth rate of trevally fish after feeding trash fish, 2) to analyze the feed conversion and efficiency of feeding trash fish, and 3) to analyze the survival rate of trevally fish by feeding trash fish in Wael Village, Westen Seram Regency. The research was conducted in May-November 2020, located in Wael Village, Minapolitan Region, Westen Seram Regency. The method used was the observation through the stages of seed selection, seed maintenance and feeding. The success of the feed given will be analyzed through the growth rates of trevally fishes that have been given feed, feed efficiency, feed conversion and survival rate of trevally fish. The results showed that the growth rate of trevally fish was 1.73% and it was classified as good. This is influenced by the stocking density which was carried out in accordance with the area of ​​the container and the needs of the fish so that the trevally fish can grow well. The feed conversion values ​​and feed efficiency were 2.97 and 33.3%, respectively. The results of the feed conversion are categorized as still feasible for a trevally fish cultivation business. The survival of trevally fish is 90-95%, this is due to the regular management of feeding, the daily control, as well as stocking density that is not too high. ABSTRAK Pakan merupakan faktor yang sangat penting dalam menentukan keberhasilan suatu usaha budidaya. Salah satu jenis pakan yang digunakan dalam kegiatan budidaya ikan laut adalah ikan rucah. Tujuan penelitian ini adalah 1) mengetahui laju pertumbuhan ikan kuwe setelah pemberian pakan ikan rucah, 2) menganalisis konversi pakan serta efisiensi pemberikan pakan ikan rucah, dan 3) menganalisis tingkat kelangsungan hidup ikan kuwe dengan pemberian pakan ikan rucah di Dusun Wael, Kabupaten Seram Bagian Barat. Penelitian dilakukan pada bulan Mei-Nopember 2020 yang berlokasi di Dusun Wael Kawasan Minapolitan Kabupaten Seram Bagian Barat. Metode yang digunakan yaitu metode observasi melalui tahapan seleksi benih, pemeliharaan benih dan pemberian pakan. Keberhasilan pakan yang diberikan akan dianalisa melalui laju pertumbuhan ikan kuwe yang telah diberikan pakan, efisiensi pakan, konversi pakan serta kelangsungan hidup ikan kuwe. Hasil penelitian menunjukan laju pertumbuhan ikan kuwe sebesar 1,73% dan tergolong baik. Hal ini dipengaruhi oleh padat tebar yang dilakukan sesuai dengan luas wadah dan kebutuhan ikan sehingga ikan kuwe dapat bertumbuh dengan baik. Nilai konversi pakan dan efisiensi pakan masing-masing sebesar 2,97 dan 33,3%. Hasil konversi pakan dikategorikan masih layak bagi suatu usaha budidaya ikan kuwe. Kelangsungan hidup ikan kuwe sebesar 90-95%, hal ini disebabkan karena manajemen pemberian pakan yang teratur, pengontrolan yang dilakukan setiap hari, serta padat tebar yang tidak terlalu tinggi. Kata Kunci : Pakan, ikan rucah, konversi pakan, efisiensi pakan, Caranx sexfasciatus

POLA FLUKTUASI POPULASI BAKTERI DI PERAIRAN PANTAI DAN TELUK PADA SENTRA BUDIDAYA IKAN LAUT DI BALI UTARA

Bakteri merupakan mikroorganisme yang secara alami berada dalam ekosistem perairan laut dan beberapa spesiesnya bersifat patogen. Penelitian ini bertujuan untuk menentukan pola fluktuasi populasi bakteri secara umum dan Vibrio spp. secara khusus di perairan pantai dan teluk sebagai dampak dari aktivitas baik panti pembenihan, tambak udang, maupun karamba jaring apung (KJA) di pesisir Bali Utara. Sampel air diperoleh dari tiga lokasi sentra budidaya laut dan satu lokasi ekowisata yang berada di Kecamatan Gerokgak Kabupaten Buleleng. Sampel air diambil dari tiga titik sampling di perairan dengan jarak 50 m, 100 m, dan 300 m dari garis pantai di Desa Gerokgak dan Desa Penyabangan. Sampling air dilakukan pada tiga titik sampling di sekitar KJA di Teluk Kaping, Desa Sumberkima, dan satu titik sampling di perairan dengan jarak 100 m dari garis pantai di Desa Pemuteran. Sampling air dilakukan sekali dalam sebulan dari bulan Februari hingga November 2018. Hasil penelitian menunjukkan bahwa total bakteri dan Vibrio spp. di empat lokasi perairan di Kecamatan Gerokgak, Bali menunjukkan populasi tinggi pada bulan Maret hingga Mei dan menurun pada bulan berikutnya. Dan meningkat kembali pada bulan Oktober hingga November. Total bakteri dan Vibrio spp. tertinggi terjadi di perairan pantai Desa Gerokgak hingga 9.067 ± 7.481 CFU/mL dan 1.147 ± 689 CFU/mL dibandingkan dengan dua lokasi sentra budidaya lainnya (Desa Penyabangan dan Teluk Kaping). Total bakteri dan Vibrio spp. teramati pula di perairan Desa Pemuteran hingga 500 ± 52 CFU/mL dan 65 ± 7 CFU/mL yang kemungkinan merupakan dampak dari aktivitas budidaya ikan. Pola fluktuasi populasi bakteri di perairan pantai Kecamatan Gerokgak, Bali dipengaruhi oleh musim dan kegiatan budidaya perikanan. Tingginya populasi bakteri Vibrio spp. pada perairan pantai dapat memengaruhi kesehatan ikan budidaya.Bacteria are a group of microorganisms naturally present in aquatic ecosystems. Some of the bacteria are pathogenic to other organisms and cause severe diseases. This study aimed to determine the fluctuation patterns of bacterial populations, with specific interest to Vibrio spp. in coastal and bay areas of North Bali which constantly receive effluents from nearby mariculture activities. Water samples were collected from three locations in a clustered marine fish farming area and one location in an ecotourism area as a control. Water samples were taken from three sampling points in the coastal area of Gerokgak and Penyabangan villages at a distance of 50 m, 100 m, and 300 m from the coastline. Water samples were also collected at three sampling points around floating net cages (KJA) in Kaping Bay, Sumberkima Village, and one sampling point in Pemuteran Village located 100 m from the coastline. Water sampling was carried out each month from February to November 2018. Results of the study showed that total bacteria and Vibrio spp. were notably higher between March-May and October-November. The total bacteria and vibrio reached the peak number at 9,067 ± 7,481 CFU/mL and 1,147 ± 689 CFU/mL, respectively, which occurred in the coastal waters of Gerokgak Village. The total bacteria and Vibrio spp. of up to 500 ± 52 CFU/mL and 65 ± 7 CFU/mL, respectively, were also observed in the waters of Pemuteran Village which are likely to be the effects of aquaculture activities in these of three locations. This study concludes that the fluctuation pattern of bacterial population in the coastal waters of Gerokgak District, Bali is primarily influenced by the season and activities of the fish farming. The high population of Vibrio spp. in the coastal waters could lead to a fish disease oubreak related to the pathogenic bacterium.

SUPPLY AND DEMAND SYSTEM UNTUK HASIL BUDIDAYA IKAN LAUT BERBASIS WEBSITE

Information on the availability of marine fish culture seeds is very important for marine fish cultivators, because availability affects prices and the sustainability of ongoing operations that require a supply of marine fish. In addition, suppliers are required to be able to meet demand for supply and keep it in balance with market demand so that market prices remain stable. The most basic problem is that the order or request process carried out by marine fish cultivators is still placing orders directly at that location. In addition, the fish supply may not be sufficient. Of course, this will take a lot of time during the order or request process between marine fish cultivators and suppliers. Another problem with suppliers is that when they are ready to harvest the fish industry, they must also be able to provide it to all parties who need a supply of fish. The purpose of this research is to design and build a web-based supply and demand system for marine aquaculture products, which is expected to encourage the supply and demand process for marine aquaculture products. The method used to analyze needs / needs in this study is structured analysis to obtain design results based on user needs. Keywords: information systems; results of marine fish farming; supply and demand system. Abstrak: Informasi tentang ketersediaan bibit budidaya ikan laut sangat penting bagi pelaku pembudidaya ikan laut, karena ketersediaan mempengaruhi harga dan keberlangsungan operasi yang sedang berlangsung yang membutuhkan pasokan ikan laut. Selain itu, pemasok dituntut untuk dapat memenuhi permintaan penawaran dan menjaganya tetap seimbang dengan permintaan pasar agar harga pasar tetap stabil. Permasalahan yang paling mendasar adalah proses order atau request yang dilakukan oleh pembudidaya ikan laut masih melakukan order langsung ditempatkan di lokasi tersebut. Selain itu, pasokan ikan mungkin tidak mencukupi. Tentunya hal ini akan menyita banyak waktu saat proses pemesanan atau request antara pelaku pembudidaya ikan laut dan supplier. Masalah lain dengan pemasok adalah ketika mereka siap memanen industri ikan, mereka juga harus bisa menyediakannya kepada semua pihak yang membutuhkan pasokan ikan. Tujuan dari penelitian ini adalah merancang dan membangun sistem supply and demand produk budidaya ikan laut berbasis web, yang diharapkan dapat mendorong proses supply and demand produk budidaya ikan laut. Metode yang digunakan untuk menganalisis kebutuhan / kebutuhan dalam penelitian ini adalah analisis terstruktur untuk mendapatkan hasil perancangan berdasarkan kebutuhan pengguna.Kata kunci: sistem informasi; supply and demand system; hasil budidaya ikan laut.

Farming fish in the sea will not nourish the world

Recent literature on marine fish farming brands it as potentially compatible with sustainable resource use, conservation, and human nutrition goals, and aligns with the emerging policy discourse of ‘blue growth’. We advance a two-pronged critique. First, contemporary narratives tend to overstate marine finfish aquaculture’s potential to deliver food security and environmental sustainability. Second, they often align with efforts to enclose maritime space that could facilitate its allocation to extractive industries and conservation interests and exclude fishers. Policies and investments that seek to increase the availability and accessibility of affordable and sustainable farmed aquatic foods should focus on freshwater aquaculture.

Seagrass of Vasiliko Bay, Eastern Mediterranean: Lost Cause or Priority Conservation Habitat?

Mediterranean coasts are affected by multiple mounting pressures. In Cyprus, marine fish farming has grown rapidly in the past decade and is concentrated in the west side of Vasiliko Bay. The east coast of this bay has ports, a power station, a desalination unit, a cement factory, a major new oil terminal, and gas storage facilities. The bay is earmarked to create the largest hydrocarbon processing, storing, and transport facility in the region. Here, we assess the status of Posidonia oceanica habitat in an understudied region at the upper thermal, and eastern limit, of this Mediterranean endemic seagrass. An extensive ancient seagrass meadow was revealed, covering about 200 ha across 10 km of coastline, over soft substrata at ca 10–30 m depth, and over hard substrata at ca 0–6 m depth. Seagrass shoot density and leaf surface area decreased, both with increasing depth and with proximity to industrial developments; part of the meadow had been destroyed by dredging to build a jetty. Close to fish farms the seagrass had higher epiphytic biomass as well as lower leaf number, mass, and surface area, all of which indicate adverse effects of eutrophication and increased turbidity. Despite these multiple stressors, most of the meadow was in good ecological status, with some of the highest shoot densities ever reported. Furthermore, iconic species like sea turtles, monk seals, and dolphins were seen during sampling. Posidonia oceanica meadows off Cyprus are among the most valuable in the Mediterranean due to their tolerance of high seawater temperatures. Managers of future coastal developments in the region will need to adhere to European legislation and international conventions designed to secure the socioeconomic benefits of seagrass beds.