Cobia cage culture distribution mapping and carrying capacity assessment in Phu Quoc, Kien Giang province

Nguyen, Hong Diep; Wenresti, Glino Gallardo; Nitin, Kumar Tripathi; Truong, Hoang Minh

doi:10.13141/jve.vol4.no1.pp12-19

Cited by 6 publications

(3 citation statements)

References 10 publications

(7 reference statements)

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“…The coastal waters of Kien Giang Province, which surround Phu Quoc and An Thoi, are of major importance to Vietnam’s marine fisheries sector (FAO, 2005; Nguyen et al, 2013). In 2014, for example, the total catch registered in Kien Giang waters was 636,170 tons, which was equivalent to 20% of the total seafood landings in Vietnam (Hines et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

“…About 2.5 million tourists visited Phu Quoc in 2018, which is an approximately 25% increase from 2017, and this upward trend is expected to continue (VNA, 2018). Consequently, the construction of service‐related coastal infrastructure (hotels, roads, leisure facilities) has boomed, and to meet growing demand, subsistence and commercial fisheries and aquaculture industries, which have traditionally operated in this area, have intensified (Nguyen et al, 2013; Hieu & Rasovska, 2017). For example, there was a roughly 580% increase in the number of registered fishing vessels between 2002 (approx.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Marine protected areas ineffectively protect seagrass and coral reef fish communities in the Phu Quoc and An Thoi archipelago, Vietnam

Tran¹,

Carve

Dong³

et al. 2022

Aquatic Conservation

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1. The Phu Quoc marine protected area (MPA) is a multiple-use MPA that was established in 2007 and is a component of Vietnam's National MPA System. The MPA is divided into two spatially separated zones based on habitat type: a seagrass zone and a coral reef zone.2. In this study, visual census data were collected in 2018-2019 and were used to derive fish biomass and community diversity metrics as proxies for ecosystem condition and function (trophic and mobility). The effectiveness of the MPA in protecting fish communities in the seagrass and coral reef zones was evaluated.An updated characterization of the Phu Quoc fish communities, and an assessment of fish community variation among regions and between habitat types, is provided.3. In total, 125 species representing 74 genera of 40 families were recorded.Omnivores were the most abundant (38%), followed by planktivores (24%), whereas piscivores (2%) were scarce. There was an especially low density of high-value fishery target species such as Haemulidae (<0.01%), Carangidae (<0.2%), Lethrinidae (<0.3%), Lutjanidae (<0.4%), Serranidae (<2%), and Chaetodontidae (<3%). Alarmingly, fishes with a total length of >20 cm only accounted for 1% of the total individuals. Species and functional composition were similar between protected and unprotected areas but differed among regions and between habitats.4. These results suggest that the protection of fishes provided by Phu Quoc MPA at the time of this study was ineffective. The taxonomic composition of fish communities has remained relatively unchanged over the last approximately 25 years, with the density of large fishes and commercial species remaining low.There is capacity to improve MPA performance by providing adequate resources for threat management and using evidence-based decision-making in management. The 2020 rezoning and expansion of the Phu Quoc MPA is discussed with regards to prioritizing biodiversity and coverage targets.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Marine protected areas ineffectively protect seagrass and coral reef fish communities in the Phu Quoc and An Thoi archipelago, Vietnam

Tran¹,

Carve

Dong³

et al. 2022

Aquatic Conservation

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“…KJA menghasilkan beban pencemar yang mengandung total nitrogen (TN) dan total fosfat (TP) dari pakan dan metabolisme ikan (Beveridge, 2004). Tingginya TN dan TP yang dihasilkan tergantung kepada jumlah produksi ikan dan penggunaan pakan (Nguyen et al, 2014). Hal ini dapat dilihat dari perbedaan jumlah produksi ikan tahun 2011 dan 2013 yaitu 36.217 ton/tahun dan 23.947 ton/tahun yang menghasilkan beban pencemar TP sebesar 269,5 ton/tahun dan 220,2 ton/tahun (Lukman et al, 2015).…”

Section: Pendahuluanunclassified

Analisis Beban Pencemar Total Nitrogen dan Total Fosfat akibat Aktivitas Antropogenik di Danau Maninjau

2021

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Penelitian ini bertujuan untuk menganalisis beban pencemar dan daya tampung total nitrogen (TN) dan total fosfat (TP) akibat dari aktivitas antropogenik di Danau Maninjau. Perhitungan beban pencemar untuk aktivitas penduduk, pertanian, peternakan dan jumlah tamu hotel menggunakan Rapid Assesment. Penetapan beban pencemar KJA dan daya tampung yang mengacu kepada Peraturan Menteri Lingkungan Hidup No 28 Tahun 2009. Lokasi penelitian yang ditetapkan berdasarkan SNI 6989.57:2008 terdiri dari 10 lokasi yaitu tengah danau, PLTA, KJA, inlet dan outlet danau. Uji ANOVA dengan tingkat kepercayaan 95% digunakan dalam melihat perbedaan data konsentrasi TN dan TP secara waktu pengambilan sampel dan lokasi sampling. Rasio TN:TP dievaluasi untuk mengetahui pembatas kesuburan perairan dan korelasinya terhadap klorofil.Konsentrasi TN berada pada rentang 0,42 – 0,95 mg/L, TP berkisar 0,18-0,66 mg/L dan klorofil-a 5,49-8,69 mg/m3. Hasil uji ANOVA, konsentrasi TN dan TP secara waktu pengambilan sampel tidak berbeda secara signifikan yaitu 0,64 dan 0,88 sedangkan secara lokasi sampling berbeda secara signifikan dengan nilai signifikansi 0,01 dan 4,03x10-6. TN dan TP memiliki hubungan yang kuat terhadap klorofil dan diperoleh rasio TN:TP<10 yang mengindikasikan nitrogen sebagai pembatas kesuburan. Beban pencemar TN dan TP terbesar berasal dari KJA yang menyumbang hampir 84,20 % dan 91,83% dari total beban pencemar. Ditinjau dari daya tampung mesotrofik beban pencemar TN belum melebihi sedangkan TP telah melebihi daya tampung sehingga perlu pengurangan hingga 71,34% untuk mesotrofik dan 90,44% untuk oligotrofik. Secara keseluruhan status trofik Danau Maninjau berada pada kondisi eutrofik dengan index 63,39. ABSTRACTThis study aims to analyze the pollutant load and the capacity of total nitrogen (TN) and total phosphate (TP) resulting from anthropogenic activities in Lake Maninjau. Calculation of the pollutant load for the activities of the population, agriculture, livestock and the number of hotel guests using Rapid Assessment. Determination of KJA pollutant load and carrying capacity refers to the Regulation of the Minister of Environment No. 28 of 2009. The research locations determined based on SNI 6989.57: 2008 consist of 10 locations, namely the middle of the lake, hydropower plant, marine cage, inlet and outlet. ANOVA test with a 95% confidence level was used to see the differences in TN and TP concentration data in terms of sampling time and sampling location. The TN: TP ratio was evaluated to determine the limitation of water fertility and its correlation to chlorophyll. TN concentrations were in the range 0.42 - 0.95 mg / L, TP ranged from 0.18 to 0.66 mg / L and chlorophyll-a was 5.49. -8.69 mg / m3. ANOVA test results, TN and TP concentrations at sampling time did not differ significantly, namely 0.64 and 0.88, while the sampling location was significantly different with a significance value of 0.01 and 4.03x10-6. TN and TP had a strong relationship to chlorophyll and the TN: TP ratio was obtained <10, which indicates nitrogen as a fertility limiter. The largest TN and TP pollutant load comes from KJA which accounts for almost 84.20% and 91.83% of the total pollutant load. Judging from the mesotrophic capacity of the TN pollutant load has not exceeded while the TP has exceeded the capacity so that it needs a reduction of up to 71.34% for mesotrophic and 90.44% for oligotrophic. Overall, the trophic status of Lake Maninjau is in a eutrophic condition with an index of 63.39.

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The Diverse World of Fishes

2020

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Cobia cage culture distribution mapping and carrying capacity assessment in Phu Quoc, Kien Giang province

Cited by 6 publications

References 10 publications

Marine protected areas ineffectively protect seagrass and coral reef fish communities in the Phu Quoc and An Thoi archipelago, Vietnam

Marine protected areas ineffectively protect seagrass and coral reef fish communities in the Phu Quoc and An Thoi archipelago, Vietnam

Analisis Beban Pencemar Total Nitrogen dan Total Fosfat akibat Aktivitas Antropogenik di Danau Maninjau

The Diverse World of Fishes

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