Marine finfish farms. Open net cage. Design and operation

2015 ◽  
Keyword(s):  
2009 ◽  
Vol 40 (3) ◽  
pp. 126-134 ◽  
Author(s):  
Heidi Moe ◽  
Rune Harald Gaarder ◽  
Anna Olsen ◽  
Odd Sture Hopperstad
Keyword(s):  

2021 ◽  
Vol 240 ◽  
pp. 109941
Author(s):  
Shuchuang Dong ◽  
Sang-gyu Park ◽  
Daisuke Kitazawa ◽  
Jinxin Zhou ◽  
Takero Yoshida ◽  
...  

2012 ◽  
Vol 23 (4) ◽  
pp. 357-367 ◽  
Author(s):  
Bruna Roque Loureiro ◽  
Christina Wyss Castelo Branco ◽  
Evoy Zaniboni Filho

OBJECTIVES: This study aimed to verify the influence of net-cage fish farming on zooplankton biomass in the Itá reservoir (Uruguay River, Brazil). METHODS: Samples were collected monthly from October/2009 to May/2010 at the surface and at the bottom in two sampling stations, the net-cage area and in a control area using a Van Dorn bottle and a plankton net (68 µm). RESULTS: The Cladocera and Copepoda biomass was estimated by dry weight using a micro-analytical balance, and the Rotifera biomass by Biovolume. Total zooplankton biomass varied between 6.47 and 131.56 mgDW.m-3 Calanoida copepod presented the highest value of biomass (127.56 mgDW.m-3) and rotifers, despite having an important contribution to total density, showed a maximum biomass of 2.01 mgDW.m-3. Zooplankton biomass at the net-cage area surface was higher when compared with the control area during the months of October to January. However, the zooplankton biomass was similar at the bottom of the two areas throughout the studied period. From February until May, zooplankton biomass decreased in both sampling stations, a fact probably associated with the flushing of the reservoir, followed by an increase in water transparency and a decrease in chlorophyll-a concentration in the following months (February to May). CONCLUSIONS: The influence of fish farming on zooplankton biomass was detected at the surface of the net-cage area only from October to January. From February to May this influence was not found, probably by the influence of the flushing of the reservoir.


Author(s):  
Yuanrong Chen ◽  
Jingfen Qiao ◽  
Jincun Liu ◽  
Ran Zhao ◽  
Dong An ◽  
...  

2015 ◽  
Vol 6 (2) ◽  
Author(s):  
Muhammad Junaidi ◽  
Mat Sardi Hamzah

ABSTRACT The development of lobster farming in floating net cage in Ekas Bay caused an environmental degradation such as decrease water quality due to some aquaculture wastes. The purposes of this study were to determine the status of water quality and their effect on growth and survival rate of lobster reared in floating net cages (FNC) in the Ekas Bay, West Nusa Tenggara Province. Water sample collection and handling referred to the APHA (1992). Analyses of water quality data were conducted using Principal Component Analysis. Determination of the water quality status of Ekas Bay was performed with STORET system. Multivariate analyses were used to determine the relationship between water quality, growth, and survival rate of lobster reared in FNC. Results showed that Ekas Bay water quality status was categorized in class C (medium contaminated), which exceeded some quality standard parameters such as ammonia (0.3 mg/l), nitrate (0.008 mg/l), and phosphate (0.015 mg/l). During lobster farming activities feeding with trash fish for 270 days, we obtained daily growth rate of  0.74% (lower than normal growth rate of 0.86%), survival rate of 66% (lower than normal survival rate of 86.7%), and feed conversion ratio of 11.15. Ammonia was found as a dominant factor reducing growth  and survival rate of lobster reared in FNC. Keywords: water quality, lobsters, growth, survival, Ekas Bay


Author(s):  
Nur Bambang Priyo Utomo ◽  
. Sulistiono ◽  
Ridwan Affandi ◽  
Thomas Nugroho ◽  
Mufti Murhum ◽  
...  

Gebe Island is one of the islands in Central Halmahera of North Maluku Province. The island has a high potential of fishery resources both for capture and aquaculture fisheries. This activity was carried out from June 2011–September 2015, aimed to improve community’s skill to stock and rear the lobster (<em>Panulirus </em>spp.) in floating net cage at Umera and Umiyal Villages for community empowerment in the Gebe Island.  Methods of these activities were training and accompaniment. Smaller size lobsters (3–4 individual per kg) were collected naturally from the sea around the Gebe Island. Based on the observation, lobster farmers community of Umera and Umiyal Villages have been stocking and rearing the lobster. The community can also harvest and sell the lobster collected from the sea reared for 2–4 months in the floating net cage.


2019 ◽  
Vol 7 (2) ◽  
pp. 449
Author(s):  
Charlly N. Eteke ◽  
Hengky Sinjal ◽  
Edwin L. A. Ngangi ◽  
Suria Darwisito

This study aims to examine the development strategy of Nile tilapia (Oreochromis niloticus) culture in Galela Lake, North Halmahera Regency, North Mollucas Province. It is a descriptive study. Data collection used direct observations, interviews, and literature studies, and data analysis applied SWOT analysis, and continued with Quantitative Strategic Planning Matrix (QSPM)).  Results revealed that there were 6 priority strategies taken to develop the culture of the nile tilapia (O. niloticus) as follows: 1. Human resources development; 2. Take advantage of the investment-providing institutions for culture development; 3. Optimize the use of nile tilapia culture in the floating net cage; 4. Broaden the marketing access; 5. Increase the fish seed quality and the product quality; 6. Agreement among the fish farmers to maintain security in the floating net cage localities.Keywords: strategy, Galela Lake, nile tilapia, SWOT, QSPM. ABSTRAKPenelitian ini bertujuan untuk mengkaji strategi pengembangan budi daya ikan nila (Oreochromis niloticus) di Danau Galela Kabupaten Halmahera Utara Provinsi Maluku Utara. Penelitan ini merupakan penelitian deskriptif. Teknik pengembilan data melalui observasi langsung dan wawancara, dan studi literature. Analisis data menggunakan analisis SWOT. Dan dilanjutkan dengan uji OSPM  (Quantitative Strategis Planning Matrix).  Hasil dari analisis data menghasilkan enam strategi prioritas untuk pengembangan budi daya ikan nila (oreochromis niloticus) yaitu 1. Peningkatan pembinaan SDM 2. Memanfaatkan lembaga penyedia modal untuk pengembangan budi daya 3. Optimalisasi lahan budi daya ikan nila di karamba Jaring apung (KJA) 4. Memperluas akses pemasaran 5. Peningkatan kualitas benih ikan nila dan kualitas produk 6. Kesepakatan antar pembudidaya dalam menjaga keamanan di lokasi karamba jaring apung (KJA).Kata Kunci : Strategi, Danau Galela, Ikan Nila, Analisis SWOT, Analisis QSPM


2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Janu Dwi Kristianto ◽  
Sunardi Sunardi ◽  
Johan Iskandar

AbstrakDanau merupakan salah satu bentuk ekosistem yang menempati daerah yang relatif kecil pada permukaan bumi dibandingkan dengan habitat laut dan daratan. Bagi manusia kepentingannya jauh lebih berarti dibandingkan dengan luas daerahnya. Sejak tahun 1985 Danau Teluk di Kota Jambi mulai digunakan sebagai lokasi budidaya ikan dengan karamba jaring apung (KJA) dengan jumlah KJA yang beroperasi pada tahun 2012 mencapai + 878 unit dari 64 pembudidaya ikan dan akan meningkat terkait penetapan Propinsi Jambi sebagai salah satu kawasan minapolitan perikanan budidaya guna peningkatan produksi perikanan. Pemanfaatan Danau Teluk sebagai media untuk budidaya ikan di KJA diperlukan upaya untuk mendorong pengelolaan terhadap sumberdaya milik umum ini agar terus bekelanjutan. Kajian mengenai dukung perairan dan pemanfaatan daya Danau Teluk Kota Jambi untuk budidaya ikan sistem KJA bertujuan untuk mengetahui daya dukung Danau Teluk yang digunakan untuk kegiatan budidaya ikan di KJA, bagaimana deskripsi pemanfaatan danau untuk budidaya ikan di KJAyang selama ini dilaksanakan oleh masyarakat sekitar dan merumuskan pola pemanfaatan Danau Teluk untuk budidaya ikan di KJA yang berbasis masyarakat secara berkelanjutan. Hasil penelitian menunjukkan  bahwa  daya dukung perairan Danau Teluk Kota Jambi untuk budidaya ikan di KJA adalah sebesar 517,617 ton ikan  per tahun dengan estimasi jumlah pakan di KJA yang diberikan pada ikan sebanyak 931,710 ton pakan ikan per tahun dengan asumsi kadar total P yang masuk ke perairan danau melalui limbah ikan sebanyak 20 kg P/ ton ikan. Jumlah ideal unit KJA yang seharusnya beroperasi di Danau Teluk berdasarkan penghitungan daya dukung danau sebanyak 862, 695 unit ~ 862 unit. Saat ini jumlah KJA yang beroperasi adalah sebanyak 878 unit sehingga perlu dilakukan pengurangan jumlah sebanyak 16 unit. Pemanfaatan Danau Teluk untuk budidaya ikan oleh masyarakat dilakukan secara sederhana dan jumlah KJA yang terdapat ternyata sudah sedikit melebihi daya dukung perairan jika dilihat dari konsentasi Total P yang ada di perairan. Peningkatan jumlah KJA yang ada di danau perlu mendapat perhatian dari pemerintah dan masyarakat setempat. Pola pemanfaatan danau untuk budidaya ikan berbasis masyarakat yang direkomendasikan adalah dengan mengeluarkan ijin usaha budidaya ikan agar kegiatan budidaya ikan dapat terkendali dan tidak merusak lingkungan, menggunakan pola pemeliharaan ikan dengan jaring ganda sehingga biaya operasional lebih efisien dan produksi ikan dapat ditingkatkan, membuat manajemen pakan dalam penerapan budidaya ikan dalam KJA, meningkatkan SDM pembudidaya ikan dan mengaktifkan kembali kelompok pembudidaya ikan sehingga koordinasi antar pembudidaya, pemerintah dan stakeholder terkait dapat terjalin serta pengaturan tata ruang KJA.Kata Kunci : pemanfaatan danau, daya dukung, Danau Teluk, budidaya ikan KJA, berbasis masyarakatAbstracLake is one of ecosytem form than occupies a relative small area on the surface of the earth as compared to sea and land habitats. For humans, utilization  is more important than the expanse of lands. Since 1985, Teluk Lake began to be used as the location of fish cultivation with floating net cage culture (FNCC). The number of FNCC in 2012 reached ± 878 unit of 64 fish farmers and it will increase related to determination of Jambi Province as one of Minapolitan fishery cultivation in order to increase fish production. Utilization of Teluk Lake as media for fish cultivation on floating cage is necessary to encourage the management of common resources is to be kept sustainable.  Studies on carrying capacity and utilization of Teluk Lake Jambi City for community-based fish cultivation on FNCC aims to know how the use of this lake that have been implemented by the local community and to find out patterns of Teluk Lake utilization to fish culture in floating cage sustainable community-based  and to find out how the carrying capacity Teluk lake that used to fish farming activities in floating cage. Methods used in this study is qualitative and quantitative methods with a descriptive approach. 1Result showed that carrying capacity of Teluk lake for fish farming in FNCC is equal  517,617 tons of  fish per year with estimate amount of feed given to fish in floating cage is as many as  931,710 ton per year assuming total P were entered into the lake through fish waste as much 20 k P/ton of fish. Ideal number of floating cage based on lake  carrying capacity accounting should be 862,695 unit ~ 862 unit. Operating floating cage currently  is  878 unit so that it is necessary reduction in the amount of 16 unit and if they want to add a new one, it should be an improvement or replacement of existing floating cage at lake. Utilization of Teluk Lake for fish farming is done simple by local communities and number of existing floating cage already slightly exceed the carrying capacity of lake if related from existing concentration of total P in water. The increasing amount of floating cages in lake should be attend from goverment and local communities, so it is necessary to manage the use of lake for fish cultivation. Pattern of lake utilization for fish farming  based- community ist recommended to issue a business licence, in order to control fish farming activity, and not damage the environment, using growt out pattern by double nets so that more efficient operating cost and fish production can be increased, making management of feed in fish farming at floating cage, develop capability of human resouces, activate again POKDAKAN so coordination between farmers, goverment and stakeholder can be build and layout arrangement FNCC. Keywords : Lake utilization, carrying capacity,Teluk Lake, fish culture on floating cage,community based


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