Shrimp yields and harvest characteristics of mixed shrimp–mangrove forestry farms in southern Vietnam: factors affecting production

Johnston, Danielle; Trong, Ngyuen Van; Tien, Doan Van; Xuan, Tran Thanh

doi:10.1016/s0044-8486(00)00348-3

Cited by 54 publications

(66 citation statements)

References 10 publications

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“…This can be either directly through the high amount of prime quality food, or indirectly via algae, fungi and bacteria. In fact, Johnston et al (2000) found that shrimp yields peaked between July and October (1996/97) in the Ca Mau province (Figure 5c). We suggest that there may be a direct relationship between the input of nutrients via leaf litter and dynamics of shrimp production.…”

Section: Nutrient Input Through Leaf Littermentioning

confidence: 95%

“…Although extension of shrimp farming in mangrove areas occurs at a rapid rate, world shrimp production has leveled off in recent years, as many aquaculture farms have either collapsed or experienced declining yields. For instance, production figures varied dramatically between the various shrimp culture systems with semi-intensive farms producing between 1000 and 2000 kg ha À1 year À1 , whereas extensive farms produced 100-400 kg ha À1 year À1 in 1996 (Johnston et al 2000), and 80-250 kg ha À1 year À1 in 2000 (Ministry of Fisheries 2001). Fish production is believed to be dependent on mangrove areas, and the dependence of many penaeid shrimp species on mangroves has also been shown (Christensen 1978;Barbier 2000).…”

Section: Introductionmentioning

confidence: 99%

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Young Mangrove Stands Produce a Large and High Quality Litter Input to Aquatic Systems

Nga

Tinh

Tam

et al. 2005

Wetlands Ecol Manage

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Mangrove swamps are key ecosystems along the Vietnam coast. Although mangrove litter is thought to represent an important input of organic matter and nutrients to the coastal aquatic systems, the factors determining the quality and size of this litter flux have not been studied so far. We monitored leaf, stipule, twig, and reproductive litter monthly in monocultures of Rhizophora apiculata mangrove forests of 7, 11, 17 and 24 years old in the Camau province, Mekong Delta, Vietnam. Litter traps were used to measure litter fall production from June 2001 till May 2002. Total litter fall was in the range of 8.86-14.16 t DW ha À1 year À1 . Leaves were the main component, and represented 70% of litter fall production in all stands. Total litter fall was lower in the older stands but the amount of reproductive litter was significantly higher in these stands (17 and 24 years). Biomass of leaf litter was highest between the end of the wet season and the beginning of the dry season. Phosphorus and nitrogen levels in leaf litter were significantly higher in younger than in older stands. Overall, our study indicated that young stands produced the highest input of litter and particularly of nitrogen and phosphorus to the surrounding aquatic system. Consequently, these stands contribute significantly to the fisheries.

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Section: Nutrient Input Through Leaf Littermentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Young Mangrove Stands Produce a Large and High Quality Litter Input to Aquatic Systems

Nga

Tinh

Tam

et al. 2005

Wetlands Ecol Manage

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“…Produksi kultivan budidaya pada umumnya rendah, namun hasil samping berupa biota ikutan menjadi pendukung produktivitas budidaya (Johnston et al, 2000). Hal ini secara tidak langsung meningkatkan pendapatan ekonomi pembudidaya meskipun hasil budidaya relatif rendah.…”

Section: Pendahuluanunclassified

Variasi Kandungan Nutrien dalam Tambak Wanamina dengan Komposisi Jenis dan Jumlah Tegakan Mangrove yang Berbeda di Pesisir Kota Semarang

Hastuti

Budihastuti

2016

BAF

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ABSTRAKKeberadaan vegetasi mangrove dalam tambak wanamina berfungsi sebagai penyedia jasa lingkungan, diantaranya dalam pengendalian suplai nutrien ke dalam kolam. Penelitian ini bertujuan untuk mengkaji variasi kandungan nutrien dalam tambak wanamina dan menguji pengaruh jenis serta jumlah tegakan terhadap perubahan kandungan nutrien tambak wanamina. Penelitian dilaksanakan selama 4 bulan dengan perlakuan jenis vegetasi (A. marina; R. mucronata; Campuran) dan jumlah tegakan mangrove (5 tegakan; 10 tegakan; 15 tegakan). Kandungan nutrien yang diamati meliputi bahan organik, nitrat, nitrogen dan fosfat terlarut. Pengamatan dilakukan sebanyak 2 kali dengan jeda waktu 1 bulan. Pengujian dilakukan dengan uji-t dan ANOVA. Hasil pengamatan menunjukkan bahwa terdapat variasi kandungan nutrien dalam tambak wanamina baik pada pengamatan pertama maupun kedua. Pola perubahan kandungan nutrien bervariasi antar jenis nutrien dimana pada beberapa perlakuan ditemukan penurunan kandungan semua jenis nutrien. Hasil uji-t menunjukkan bahwa antar periode pengamatan tidak terdapat perbedaan yang signifikan terhadap kandungan bahan organik, nitrat, nitrogen dan fosfat terlarut. Hasil ANOVA menunjukkan bahwa tidak terdapat pengaruh yang signifikan terhadap kandungan nutrien dalam tambak wanamina baik pada pengamatan pertama maupun kedua. Perbedaan kandungan nutrien yang signifikan hanya diperoleh pada kandungan bahan organik pada pengamatan pertama. Kata kunci: jenis, jumlah tegakan, mangrove, nutrien, wanamina ABSTRACTThe presence of mangrove vegetation in silvofishery ponds provide environmental services, such as controling nutrient supply to the ponds. This research aimed to study the variations of nutrient concentration in silvofishery pond and to analyze the effect of mangrove species and stand population on the change of nutrient concentration in silvofishery ponds. Research was conducted for 4 months involving treatments of mangrove species (A. marina; R. mucronata; Mixed) and stand population (5 stands; 10 stands; 15 stands). Concentration of nutrient observed in this research were dissolved organic matter, nitrate, nitrogen and phosphate. Observations were conducted twice with spare period of 1 month. Analysis were conducted with ttest and ANOVA. The observation result showed there were variation of nutrient concentration in silvofishery pond for both first and second observations. Change pattern of nutrients were varied among nutrient types, were some treatments showed consistent decrease for all nutrient types. Result of t-test showed there were no significant difference of dissolved organic matter, nitrate, nitrogen and phosphate resulted from first and second observations. ANOVA showed generally there were no significant efect of the treatments on the concentration of nutrient in silvofishery pond partially in first observation and second obsercation. Significant difference of nutrient concentration was achieved from organic matter in first observation.

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“…Hingga tahun 2000 luas lahan tambak silvofishery di Kabupten Subang dilaporkan telah mencapai sekitar 5.300 ha dengan kisaran produksi udang budidaya (200-300 kg/ha/ tahun); bandeng budidaya (500-700 kg/ha/tahun) dan udang/ikan liar (100-400 kg/ha/tahun) (Primavera, 2000;Sutirda, 2000). Produksi udang tersebut hampir sama dengan hasil yang didapatkan pada teknologi mixed shrimp-mangrove forestry di Provinsi Tam Giang, Vietnam dengan produksi rata-rata 286 (± 106) kg/ha/tahun (Johnston et al, 2000). Produksi maksimal didapatkan umumnya pada petakan dengan rasio mangrove dan tambak 80% : 20% (Takasima dalam Primavera, 2000;Wibowo & Handayani, 2006).…”

Section: Pendahuluanunclassified

Kelayakan Rekayasa Tambak Silvofishery Di Kecamatan Blanakan Kabupaten Subang Provinsi Jawa Barat

Tarunamulia

Mustafa

Hasnawi

et al. 2015

Jurnal Riset Akuakultur

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ABSTRAKDi Indonesia, silvofishery diharapkan dapat menjadi salah satu alternatif terbaik untuk mencapai pengelolaan ekosistem mangrove dan tambak ekstensif secara optimal dan berkelanjutan. Penelitian ini bertujuan untuk mengevaluasi status kelayakan rekayasa tambak silvofishery di Desa Jayamukti Kecamatan Blanakan Kabupaten Subang Provinsi Jawa Barat. Evaluasi dilakukan dengan menerapkan metode survai tingkat detail yang berbasis sistem informasi geografis (SIG) dan memanfaatkan citra satelit worldview-2. Survai lapang meliputi pengambilan contoh tanah, pengukuran elevasi lahan tambak, pengukuran pasang surut, dan pengukuran kualitas air secara insitu. Hasil kajian ini menunjukkan bahwa kondisi rekayasa tambak eksisting dapat berpengaruh langsung maupun tidak langsung pada produktivitas dan keberlanjutan tambak silvofishery di lokasi studi. Ketidaksesuaian lebar dan kedalaman saluran dengan kondisi tunggang pasut lokal (< 1 m) menyebabkan tidak efektifnya fungsi saluran dalam menyediakan kuantitas dan kualitas air yang optimal untuk kegiatan budidaya. Selanjutnya penelitian ini juga menemukan ketinggian pematang primer dan sekunder eksisting umumnya lebih rendah dibandingkan ketinggian pematang ideal dengan selisih rata-rata masing-masing -0,68 m hingga -0,56 m. Nilai salinitas air dengan kisaran 7-65 ppt juga merupakan faktor pembatas utama produktivitas lahan. Nilai salinitas air tambak yang tinggi berkaitan erat dengan variasi spasial elevasi dasar tambak dan penurunan efektivitas fungsi saluran tambak akibat sedimentasi. Jika faktor pembatas lingkungan dan ketidaksesuaian rekayasa tambak tersebut tidak ditangani dengan baik tentunya akan mengancam keberlanjutan kegiatan budidaya berbasis silvofishery di lokasi penelitian.KATA KUNCI: silvofishery, rekayasa tambak, kualitas lingkungan, SIG, Kabupaten Subang ABSTRACT:The

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Shrimp yields and harvest characteristics of mixed shrimp–mangrove forestry farms in southern Vietnam: factors affecting production

Cited by 54 publications

References 10 publications

Young Mangrove Stands Produce a Large and High Quality Litter Input to Aquatic Systems

Young Mangrove Stands Produce a Large and High Quality Litter Input to Aquatic Systems

Variasi Kandungan Nutrien dalam Tambak Wanamina dengan Komposisi Jenis dan Jumlah Tegakan Mangrove yang Berbeda di Pesisir Kota Semarang

Kelayakan Rekayasa Tambak Silvofishery Di Kecamatan Blanakan Kabupaten Subang Provinsi Jawa Barat

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