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  • 1
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    Assessment of the survival and growth rate of some hard coral species rehabilitated in Ly Son MPA Quang Ngai province (2019)
    Details
    Publication Date: 2021-05-19
    Description: The total 3,630 foliose corals belonging to Pachyseris speciosa, Merulina scabriculata, Montipora verucosa and Echinopora lamellosa species were translated to restoration in Ly Son MPA. Translated hard corals to restoration were successfully and effectively rehabilitated by using techniques to attach fragment on dead coral substratum and concrete sink (reef balls). Mean survival rate of coral fragments ranged from 96.9% (± 2.7 SD) to 98.5% (± 1.3 SD) on the concrete sink and dead coral substratum, respectively. The growth rate of three species Echinopora lamellosa, Merulina scabriculata and Montipora verucosa ranged between 1.5–2.1 mm/month and did not differ between concrete sink, dead coral substratum and control (P 〉 0.05). Meanwhile Pachyseris speciosa showed a low growth rate of 0.9–1.5 mm/month which was significantly different between translated fragments and control (P 〈 0.05). The rehabilitation and protection activities of coral reefs in Ly Son should be continued and expanded, contributing to the protection of biodivesity and marine resource for sustainable economic development.
    Description: Published
    Keywords: Coral reef ; Hard coral ; Rehabilitation ; Ly son MPA
    Repository Name: AquaDocs
    Type: Journal Contribution , Not Known
    Format: pp. 93 - 99
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  • 2
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    Status of exploitation of marine resources in the world biosphere reserve of Cu Lao Cham - Hoi An (2019)
    Details
    Publication Date: 2021-05-19
    Description: Assessments of commercial and seed resources of target species in the waters of the World Biosphere Reserve of Cu Lao Cham - Hoi An were conducted through 11 consultations at 11 local communes/wards surrounding the Reserve in November-December 2015 in combination with analysis of 150 samples collected from fishing boats using various fishing gears and landing sites in the rainy (November 2015) and dry (June 2016) seasons. Assessments of spawning and nursery grounds of target resources were conducted in three main periods (December 2015, June and August 2016). Results from this study show that there were 29 fishing gears catching more than 208 species of fishes, molluscs, crustaceans, echinoderms and polychaetes, in which 36 species are considered as target resources. The total catch of commercial and seed resources was about 12,796.4 tons and 7,405,800 individuals (7,020,400 seeds equivalent to 780 kg of seeds of orange-spotted spinefoot and 385,400 seeds of mangrove red snapper, orange-spotted grouper, malabar grouper, spotted scat and mud crab), giving a revenue of 210 billion VND (about 9.5 million USD) harvested in 2015, in which fishes are the most important resources. The waters surrounding the coral reefs and estuary supported a total catch of about 10.8 and 22.2 times higher than that in the Thu Bon estuary and the coral reefs in Cu Lao Cham islands respectively. The area surrounding the mud flats (Go Hi) in Cam Thanh commune where nypa palms and seagrasses grew is the most important nursery ground for seeds of target species.
    Description: Published
    Keywords: World biosphere reserve ; Marine resources ; Seed resources
    Repository Name: AquaDocs
    Type: Journal Contribution , Not Known
    Format: pp. 115-128
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  • 3
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    An assessment on the effectiveness of coral reef management by tourism sector in Nha Trang bay, Viet Nam (2019)
    Details
    Publication Date: 2021-05-19
    Description: The models of coral reef management for the development of ecological tourism were conducted under the coordination among the 3 businesses (Khanh Hoa Salanganes Nest Company, Vinpearl Nha Trang and Tri Nguyen Tourism), Institute of Oceanography and Khanh Hoa Department of Natural Resources & Environment. The analysis of trends of coral cover, density of reef fishes and big size invertebrates at 3 sites allowed assessing effectiveness of 3 years’ management. The stability of hard coral cover, except the decline at southern Hon Tam due to impacts of the typhoon in Nov., 2017 indicated no increased damage to corals from human activities. However, the dominance of small size fish (〈 10 cm in length), the decline of density of larger size fish and the poorness of large size invertebrate showed continuous overexploitation at these managed areas.
    Description: Published
    Keywords: Ecological tourism ; Coral reef ; Management effectiveness
    Repository Name: AquaDocs
    Type: Journal Contribution , Not Known
    Format: pp. 73-80
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  • 4
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    Coral reef fishes in the coastal waters of Ninh Thuan province (2021)
    Details
    Publication Date: 2021-09-30
    Description: This study was conducted to evaluate the species composition and distribution of coral reef fish communities at 24 sites in three areas Ninh Hai, Phuoc Dinh, and Ca Na in Ninh Thuan province from 2018 to 2019. A total of 301 species belonging to 131 genera and 49 families of coral reef fishes were recorded. Among them, the wrasse (Labridae: 55 species), the damselfish (Pomacentridae: 46 species) and the butterflyfish (Chaetodontidae: 26 species) occupy the three highest proportion. The average density of coral reef fish in coastal waters of Ninh Thuan province is 106.8 ± 23.4 individuals/100 m2, most of them are small sized fish and ornamental fish groups. Ninh Hai has a higher species richness and density than other areas. Meanwhile, Ca Na and Phuoc Dinh have the two highest densities of the large sized fish and food target fish groups. This research also points out the impact of monsoon on the density and distribution of coral reef fish, in which Ninh Hai is most affected.
    Description: Published
    Description: Refereed
    Keywords: Ninh Thuan province ; Reef fish
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: pp. 125-139
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  • 5
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    Macrobenthic community status at coastal cage aquaculture area in Xuan Dai bay, Phu Yen province, Vietnam (2022)
    Details
    Publication Date: 2022-11-16
    Description: Lobster cage culture started around 1990 in Xuan Dai bay and grew fast in recent years, contributing significantly to the socio-economic development of the region. But the impact on the ecological environment of cage culture operation also needs to consider. This paper points out the status of the macrobenthic community, studied at two stations inside the cage culture area (X1, X2) and one reference station (Xr) in the non-cage culture area. A total of 90 samples with 5 replicate samples per station were collected in six surveys during the dry and rainy seasons from June 2019 to May 2020. These samples were classified and recorded into 80 taxa belonging to 49 families and 5 classes. The class Polychaetes had the most diverse species composition with 53 taxa (66% of the total number of taxa). The crustacean group had 14 taxa (18%) belonging to 13 families; Molluscs had 9 taxa (11%) belonging to 6 families of class Bivalvia. The echinoderms had 4 taxa (5%). Capitella capitata, a species known as an indicator of organic pollution, was recorded in both stations of the culture area but was not present at the reference station. Furthermore, some dominant species presented in the culture stations such as Cossura longocirrata (contributed 43.52% in station X1) and Ceratonereis sp. (contributed 27.57% in station X2). These species are considered opportunistic species that can adapt to disturbed environmental conditions. Significantly, the species of echinoderms group were only recorded in the reference station. The species composition was only about 24% similar to those at the cage culture stations. The species richness index (D) values ranged from 1.50 (X2.6) to 6.82 (Xr.3). The diversity index (H′) varied from 0.88 (X2.4) to 2.98 (Xr.3). The evenness index (J) had the lowest average value at station X2 (J = 0.59 ± 0.20) and the highest value at the reference station Xr (J = 0.78 ± 0.03). The indices D, H′ and J of the macrobenthic community at the reference stations have higher average values compared to those estimated at cage culture stations. These results proved cage culture activities have gradually impacted the benthic fauna, reduced biodiversity, and encouraged the appearance of opportunistic species. Thus, further studies on the macrobenthic community dynamic with ecological criteria are necessary to establish a set of biological indicators to monitor the environmental quality of the coastal aquaculture area.
    Description: Published
    Description: Refereed
    Keywords: Coastal cage aquaculture ; Macrobenthic community
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: 189-198
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  • 6
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    Status and temporal changes in reef fish communities in Hon Cau marine protected area, Binh Thuan province (2022)
    Details
    Publication Date: 2022-11-15
    Description: A study on the status and temporal changes in communities of coral reef fishes in Hon Cau Marine Protected Area was carried out at 12 reef sites in August 2020 in combination with the data from previous studies. A total of 351 species belonging to 128 genera and 45 families of coral reef fish were recorded. The average density in 2020 was 237.3 ± 82.8 individuals/100m2, mainly occupied with small-sized fishes (accounting for 86.8% of total density) and ornamental fish, with the dominant families of damselfishes, wrasses, and cardinalfishes, while the the large-sized fish accounts for a very low rate. Target fishes were found in very low density and dominated by herbivorous feeders (especially rabbitfishes). The area around Hon Cau Island have species diversity (accounting for 94.4% of total species recorded in 2020) and a density of reef fish compared to the Breda shoal and coastal areas. The analysis results show that there were three distinguished assemblages of reef fishes, in which the reef fish communities around Hon Cau Island are different from the shoal and coastal areas. After nearly ten years of establishing Hon Cau MPA, coral reef fish density is maintained relatively stable in the area around Hon Cau Island and significantly decreased in Breda shoal and the coastal areas. There is an increase in the density of herbivorous fishes, while the large-sized and inextricably linked to the coral reef (groupers, snappers, sweetlips, butterflyfishes) with very low or reduced densities over time.
    Description: Published
    Description: Refereed
    Keywords: Coral reef fish ; Marine protected area
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: 153-172
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  • 7
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    A study on the spawning season of 3 Acropora species in Nha Trang bay, Southern waters of Vietnam (2022)
    Details
    Publication Date: 2022-11-15
    Description: Specimens for the study on coral spawning of three species were collected at two sites in Nha Trang bay, South Vietnam, in 2014, 2015, 2016, 2018 and 2019. The determination of spawning seasons was based on observations of gonadogenesis development of A. florida and A. robusta and variation of egg average sizes of these two species and A. hyacinthus. Data analysis and comparative discussions allow us to assume that the 3 Acropora species exhibited single cycle spawning annually and their spawning period occurred in March/April between the full moon and crescent moon. However, their maturity periods were not the same, starting before and ending after the full moon for A. florida and A. robusta but starting after the full moon and lasting until the crescent moon for A. hyainthus. Further studies are needed to improve the understanding of coral spawning and support coral restoration using sexual reproduction.
    Description: Published
    Description: Refereed
    Keywords: Coral reef ; Acropora ; Maturity ; spawning season ; Moon cycle
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: 21-28
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