Improving Biological Reefing Viability Index as a Predictive Tool for Assessment of Potential Reefing Site in the Tropical Shallow Offshore Environment

2021 ◽  
Author(s):  
Y. S. Hii ◽  
M. H. Mohd ◽  
Mohd Izzat Mohd Thiyahuddin ◽  
M. A. A Rahman ◽  
C. H. Tan
Keyword(s):  
Artificial Reef ◽  
Artificial Reefs ◽  
Rapid Screening ◽  
Critical Parameters ◽  
Sediment Type ◽  
Local Data ◽  
Predictive Tool ◽  
Sea Temperature ◽  
Habitat Creation ◽  
Larvae Density

Abstract The current study improved the predictive capability of the biological reefing viability index (BRVI) calibrated using local data. The prediction capability of the BRVI improved from 61% to 76% accuracy out of the 181 locations where the underwater videos available for verification. The BRVI includes corals larvae density, age of larvae at site, sea current, sea temperature, chlorophyll-a, water depth and sediment type to predict biological productivity of an area. Among the parameters, corals larvae density and age of the larvae are the most critical parameters that influent establishment of new biological ecosystem. The BRVI uses settlement of corals larvae as the precursors for the establishment of new habitats in the offshore environment because scleractinian corals is known to be able to form backbone of a new habitat in the environment. In this approach, the BRVI focuses on habitat creation instead of just being a fish aggregating device (FAD) when an artificial reef is deployed in an area. The BRVI can be used as a rapid screening tool to identified potential area for deployment of artificial reefs. The BRVI could reduce the chances of artificial reefs deployment that failed to address its objectives and intended outcomes.

scholarly journals The role of habitat creation in coral reef conservation: a case study from Aceh, Indonesia

Oryx ◽  
2012 ◽  
Vol 46 (4) ◽  
pp. 501-507 ◽  
Author(s):  
Nur Fadli ◽  
Stuart J. Campbell ◽  
Kathryn Ferguson ◽  
Jude Keyse ◽  
Edi Rudi ◽  
...  
Keyword(s):  
Local Community ◽  
Coral Cover ◽  
Artificial Reef ◽  
Marine Conservation ◽  
Artificial Reefs ◽  
Conservation Strategy ◽  
General View ◽  
Sea Temperature ◽  
Habitat Creation ◽  
Almost All

AbstractWe describe the successful creation of new reef habitat on Pulau Weh, Indonesia. Coral cover on artificial reef modules increased from a mean of 24±SE 2.4% 1 year after the initial attachment of Acropora spp. coral fragments to 64±SE 4.8% after 3 years. The artificial reef modules were also rapidly colonized by coral recruits. Recruit densities were 53±SE 3.2 m−2 on modules that had been submerged for only 1 year, nearly twice as high as recruit densities on natural reef substratum (31±2.8 m−2). Consequently, the original Acropora assemblage had increased to include at least 23 coral taxa, including 10 additional Acropora species. The artificial reefs also supported at least 29 reef fish species, from 11 families. Unfortunately, this initial success in habitat creation was abruptly halted by a rapid rise in sea temperature in May 2010 that killed almost all corals on the artificial reefs and on nearby natural reefs. Notwithstanding the general view that reef rehabilitation is yet to deliver ecological and conservation benefits at meaningful scales, other benefits of this project included raising the awareness of reef conservation in the local community, promotion of tourism on Pulau Weh and job creation. We conclude, therefore, that habitat creation has a legitimate role as part of an integrated marine conservation strategy.

scholarly journals REDUCTION OF WAVE OVERTOPPING RATE BY THE USE OF ARTIFICIAL REEFS

1988 ◽  
Vol 1 (21) ◽  
pp. 23
Author(s):  
Toru Sawaragi ◽  
Ichiro Deguchi ◽  
San-Kil Park
Keyword(s):  
Wave Breaking ◽  
Artificial Reef ◽  
Numerical Procedure ◽  
Artificial Reefs ◽  
Irregular Waves ◽  
Analysis Method ◽  
Wave Analysis ◽  
Wave Overtopping ◽  
Unidirectional Flow ◽  
Individual Wave

A wave overtopping rate from a sea dike of various toe depths is formulated based on a weir model in an unidirectional flow. To evaluated the wave overtopping rate from a seadike on an artificial reef by the weir model, a numerical procedure for predicting wave transformations including the effect of forced wave breaking on the reef is constructed. After confirming the applicability of the model through experiments with regular and irregular waves, the effect of artificial reef on wave overtopping is discussed. So-called individual wave analysis method is shown to he applicable to the wave overtopping caused by irregular waves.

Dispersal of yellowtail kingfish (Seriola lalandi) from a coastal embayment following a recreational fisheries enhancement stocking program: attempts to integrate aquaculture and habitat-based initiatives

2021 ◽  
Author(s):  
Alistair Becker ◽  
Michael B Lowry ◽  
D Stewart Fielder ◽  
Matthew D Taylor
Keyword(s):  
Artificial Reef ◽  
Artificial Reefs ◽  
Recreational Fisheries ◽  
Dispersal Patterns ◽  
The North ◽  
Sea Ranching ◽  
In The Wild ◽  
Yellowtail Kingfish ◽  
Seriola Lalandi ◽  
Fisheries Enhancement

Fisheries enhancement initiatives including marine stocking and artificial reef deployments are becoming increasingly common in many parts of the world. Combining the two by releasing hatchery reared fish onto artificial reefs is used in sea-ranching operations but is an approach rarely adopted for recreational fisheries. Yellowtail kingfish (Seriola lalandi) form a valuable recreational fishery in Australia and in 2018 a pilot stocking program was initiated to enhance this fishery. Fish were released onto estuarine artificial reefs in Botany Bay to evaluate if estuarine artificial reefs are suitable release habitat for juvenile yellowtail kingfish and to monitor their dispersal patterns using acoustic telemetry and a tag-recapture program. Both approaches showed similar patterns, indicating juvenile yellowtail kingfish rapidly dispersed from the release location and can travel at least 60 km during their first weeks in the wild. Twenty percent of the acoustically tagged fish entered nearby estuaries to the north and south and tagged fish were also recaptured in these estuaries, indicating that the estuaries provide habitat for juveniles. There was little interaction between stocked fish and two large coastal artificial reefs positioned near Botany Bay. Stocked yellowtail kingfish will likely disperse rapidly from release locations which is consistent with their pelagic life history. While this may present challenges to fisheries managers, increasing release numbers to maintain stocking densities over a broader area may provide a solution. Future releases of fish on coastal natural and artificial reefs are an important next step in refining stocking practices for this species and will help further identify key juvenile habitats.

Artificial Reefs in Marseille: From Complex Natural Habitats to Concepts of Efficient Artificial Reef Design

2010 ◽  
pp. 81-82 ◽  
Author(s):  
E. Charbonnel ◽  
F. Carnus ◽  
S. Ruitton ◽  
L. Le Direac’h ◽  
J.-G. Harmelin ◽  
...  
Keyword(s):  
Artificial Reef ◽  
Artificial Reefs ◽  
Natural Habitats

Impact of artificial reefs on sediment bacterial structure and function in Bohai Bay

2019 ◽  
Vol 65 (3) ◽  
pp. 191-200 ◽  
Author(s):  
Yu Wang ◽  
Jinsheng Sun ◽  
Enjun Fang ◽  
Biao Guo ◽  
Yuanyuan Dai ◽  
...  
Keyword(s):  
Artificial Reef ◽  
Control Area ◽  
Structure And Function ◽  
Artificial Reefs ◽  
Rrna Genes ◽  
Bohai Bay ◽  
Reef Area ◽  
The Future ◽  
And Function ◽  
And Control

Artificial reefs have significantly altered ecological and environmental conditions compared with natural reefs, but how these changes affect sediment bacteria structure and function is unknown. Here, we compared the structure and function of the sediment bacterial community in the artificial reef area, the future artificial reef area, and the control area in Bohai Bay by 16S rRNA genes sequencing. Our results indicated that bacteria communities in the sediment were both taxonomically and functionally different between the reef area and control area. In the artificial reef area, the α-diversity was significantly lower, whereas the β-diversity was significantly higher. Functional genes related to chemo-heterotrophy, nitrate reduction, hydrocarbon degradation, and the human pathogens and human gut were more abundant, whereas genes related to the metabolism of sulfur compounds were less abundant in the artificial reef than in the control area. The differences in bacterial communities were primarily determined by depth in the artificial reef area, and by total organic carbon in the future reef area and control area. This study provides the first overview of molecular ecology to assess the impacts of artificial reefs on the bacteria community.

Erosion Mitigation Using Submerged Breakwater Composed of Artificial Reefs

2015 ◽  
Vol 744-746 ◽  
pp. 1171-1174
Author(s):  
Kyu Han Kim ◽  
Bum Shick Shin
Keyword(s):  
Wave Attenuation ◽  
Three Dimensional ◽  
Artificial Reef ◽  
Beach Erosion ◽  
Artificial Reefs ◽  
Return Flow ◽  
Two Dimensional ◽  
Submerged Breakwater ◽  
Erosion Mitigation ◽  
Study Offer

In this study, erosion mitigation by submerged breakwater with artificial reefs is investigated among other means of countermeasures. Beach erosion mechanism near the submerged breakwater and the performance of artificial reef blocks are analyzed in the laboratory. Two-dimensional and three-dimensional laboratory experiments are applied to the analysis. The results of two-dimensional experiments prove that new artifi-cial blocks showed a better performance than the existing blocks in terms of wave attenuation due to wave breaking turbulence near the crest of the structure. Three-dimensional experiments show reduced return flow velocity by half by installing another type of new artificial block in between submerged breakwaters. Return flow has been creating vulnerability in countermeasures by submerged breakwater. Therefore, artifi-cial reef blocks suggested by this study offer solutions to the existing mitigation problems with submerged breakwater.

scholarly journals Artificial Reef Effect in relation to Offshore Renewable Energy Conversion: State of the Art

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Olivia Langhamer
Keyword(s):  
Renewable Energy ◽  
Side Effect ◽  
Artificial Reef ◽  
Wind Farms ◽  
Offshore Wind ◽  
Artificial Reefs ◽  
Offshore Wind Farms ◽  
Positive Side ◽  
Native Populations ◽  
New Habitats

The rapid worldwide growth of offshore renewable energy production will provide marine organisms with new hard substrate for colonization, thus acting as artificial reefs. The artificial reef effect is important when constructing, for example, scour protections since it can generate an enhanced habitat. Specifically, artificial structures can create increased heterogeneity in the area important for species diversity and density. Offshore energy installations also have the positive side effect as they are a sanctuary area for trawled organisms. Higher survival of fish and bigger fish is an expected outcome that can contribute to a spillover to outer areas. One negative side effect is that invasive species can find new habitats in artificial reefs and thus influence the native habitats and their associated environment negatively. Different scour protections in offshore wind farms can create new habitats compensating for habitat loss by offshore energy installations. These created habitats differ from the lost habitat in species composition substantially. A positive reef effect is dependent on the nature and the location of the reef and the characteristics of the native populations. An increase in surface area of scour protections by using specially designed material can also support the reef effect and its productivity.

scholarly journals Reef Fishes Colonization Rate Around Artificial Reef in Putus-putus Island, South-East Minahasa District

2017 ◽  
Vol 5 (1) ◽  
pp. 21
Author(s):  
Laurentius T. X. Lalamentik ◽  
Unstain N. W. J. Rembet ◽  
Adnan S. Wantasen
Keyword(s):  
Reef Fish ◽  
Fish Species ◽  
Research Effort ◽  
Artificial Reef ◽  
Environmental Parameters ◽  
Reef Fishes ◽  
Artificial Reefs ◽  
Colonization Rate ◽  
Study Sites ◽  
Number Of Individuals

A comprehensive research effort was directed to increase the ecological role of Putus-Putus island coral reefs. This study was an implementation of artificial reef technology as fish colonization locality. The artificial reefs were made of 20x20x100 cm-concrete blocks placed in 6 levels and located at the depth of 8-10 m. Reef fish observations were done three times in two locations. Environmental parameters, such as temperature, salinity and visibility, were also measured. Environmental parameters (temperature, salinity a. Water temperature (29.65oC and 29.64oC) supported the coral growth as well. Salinity distribution  was not significantly different among the study sites.  This study also found 37 reef fish species belonging to 18 families. Number of species varied with observed time and localities. Total number of individuals increased with number of fish species. Mean number of individuals and species of reef fish in locality B were higher than those in locality A. Moreover, the reef fish colonization rate in the study site followed the model y = 4.3801e0.5249x with R2= 0.9297 in the strait and y = 5.0397e0.5493x  with R2= 0.9297 for the Bay. Keywords: Artificial reefs, reef fish. Abstrak Suatu upaya penelitian yang komprehensif diarahkan untuk peningkatan fungsi ekologi terumbu karang Pulau Putus-Putus. Penelitian ini berupa penerapan teknologi terumbu buatan sebagai tempat hunian ikan. Terumbu buatan terbuat dari balok cor beton berukuran 20x20x100 cm bersusun 6 dan ditempatkan pada kedalaman 8-10 m. Pengamatan ikan karang dilakukan 3 kali di 2 lokasi berbeda. Parameter lingkungan, seperti suhu, salinitas, dan kecerahan, juga diukur.    Hasil pengukuran yang diperoleh (29,65 oC dan 29,64 oC) termasuk suhu yang optimal untuk pertumbuhan karang. Dari hasil penelitian, ditemukan 37 spesies yang masuk dalam 18 famili ikan karang. Jumlah spesies yang ditemukan bervariasi pada setiap waktu dan lokasi pengamatan. Pengambilan spesies ikan karang dilakukan pada 2 lokasi dengan masing-masing lokasi dilakukan 3 kali pengambilan sampel. Berdasarkan hasil yang diperoleh (tabel 03) dapat dilihat bahwa jumlah individu bertambah seiring dengan banyaknya jumlah spesies ikan karang yang didapat. Rata-rata jumlah individu dan jumlah spesies ikan karang pada lokasi B lebih banyak. Laju hunian ikan karang di lokasi penelitian mengikuti model y = 4.3801e0.5249x dengan R2= 0,9297 untuk lokasi Selat dan y = 5.0397e0.5493x  dengan R2= 0,9297 untuk lokasi Teluk. Kata kunci : Terumbu buatan, ikan karang

scholarly journals POTENTIAL FISH GROUND BREEDING AREA BASED ON LOCALIZED CRITERIA FOR SUSTAINABLE FOOD SECURITY

2019 ◽  
Vol XLII-4/W16 ◽  
pp. 719-728
Author(s):  
N. A. A. Zamzuri ◽  
M. I. Hassan
Keyword(s):  
Food Security ◽  
Marine Ecosystem ◽  
Chlorophyll Concentration ◽  
Artificial Reef ◽  
Fish Population ◽  
Artificial Reefs ◽  
Population Increase ◽  
Breeding Area ◽  
Weighted Analysis ◽  
Potential Area

Abstract. Fish are the part of marine ecosystem and play an important role as contributors of nutrients and dependent on the ecosystem which is affected by the parameters to provide the right conditions for reproduction. Artificial reefs were being applied as an approach to sustain food security. Food security is a major concern for all countries in the face of population increase and diminishing water supplies including in the fisheries sector. Hence, artificial reefs become one of the methods to improve the preservation of fish supplies. Suitable environment for fish ground breeding area need to be identified in order to place the artificial reef. Therefore, this study is proposed to locate the potential fish ground breeding area in Terengganu, Malaysia based on localized criteria which is suitable to place the artificial reefs by examining the parameters in the area. Parameters that have been studied were water temperature, water salinity, water acidity, chlorophyll concentration and dissolve oxygen. Those parameters have their own criteria that represent the suitability for fish population. Localized data have been applied in order to analyse and support localized criteria for this study area. To locate the potential fish ground breeding area, Geographic Information System (GIS), Multi-criteria Decision Analysis (MCDA), Spatial Interpolation and Weighted Analysis have been applied. For MCDA, Analytical Hierarchy Process (AHP) has been used to get the weightage of the parameters by running Pairwise Comparisons between the selected parameters using AHP software, Expert Choice. Then, those parameters weightage were applied in weighted analysis to identify the potential ground breeding area. At the end of this study, final map showing the location for fish ground breeding area. The final output resulted potential location for fish ground breeding area in four classes which are very high, high, medium and low potential area. This study may facilitate the decision makers to place the artificial reefs in potential area to increase fish population.

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