Implementation of Decision Support System for Integrated Coastal Zone Management of Sustainable Mariculture Development Industry in Indonesia

Indonesia has abundant and potential coastal resources for future development of mariculture industry activities. However, complex problem is found in the land and coastal zone utilization, among others: coastal environment degradation, resources depletion, conflict and overlapping utilization of marine area. New perspective of Decision Support System (DSS) for integrated coastal zone management (ICZM) can be used to solve this complexity with respect to the results of high resolution of hydrodynamic and wave numerical model, water quality, and ICZM. The aim of this paper is to determine the suitable site for the implementation of sustainable future development of mariculture in Galang Island, Riau Province, Indonesia. A suitability map of geographic information system based on ICZM is indicated by sixteen thematic maps. Implementations of the comprehensive ICZM of DSS criteria prove that Galang Island has a bright potential of Grouper mariculture development industry by sustainable suitable area of about 12,940 hectares.


Introduction
The global fishery production declines because of commercial fish harvesting at or above their maximum sustainable yield, while, demand for fish and fishery products increase steadily in recent years.Mariculture is one of the most important protein food supplier and fastest growing food production sectors to the world population [1][2][3][4].However, its development has focus very minimal on environmental sustainable practice with respect to coastal environment degradation, overlapping and conflicting utilization, laws regarding marine, and coastal management [5].
Many countries have adopted Integrated Coastal Zone Management (ICZM) and implied it, surprisingly the result does not meet their expectation especially in developing countries [6].The growth of mariculture in the coastal zones causes a lot of pressure over the fragile coastal environment, which supports various key economic and subsistence activities [2].
Therefore, the implementation of the integrated management of coastal and open seas in the future will become an added-value product to the revenue of all maritime industries and also international agreements for the sustainable exploitation of the sea resources [6].Then, as the largest archipelagic state in the world, it is important for Indonesia to establish ICZM for sustainable mariculture development.
The Decision Support System (DSS) methodology is an approach to structuring and supporting the ICZM decision-making process through the screening of data, the assessing of stakeholders, and the scanning of development strategies [7].The use of DSS for ICZM has been developed to meet the flexibility of dynamic environment.This method can be used to overcome the complexity of ICZM which are required to determine the integration of bio-geo-physical environment as well as policy decisions.It is a computerized system capable to support and assist decision maker in ICZM [8], and also can be used to solve multiple discipline issues and has the ability to integrate multi-disciplinary environment [6].Several authors discuss the development of planning tools for the management of mariculture, using Geographic Information Systems (GIS) [9][10][11][12].
It is important that all those who have an interest in mariculture and coastal marine environments remain proactive and develop holistic approaches to sustainable management.Clearly, more effective government policy/regulations and legislations are needed toward the sustainability of mariculture, particularly in terms of more effective farm planning, site selection, and management that carefully consider the carrying capacity of the environment and the needs of the other users of the coastal resources [2].

Material and Method
New perspective of DSS for ICZM can be used to solve the complexity with respect to the results of high resolution of hydrodynamic and wave numerical model of 5 years simulation selected (2005)(2006)(2007)(2008)(2009), water quality, and ICZM.In this paper, the implementation of ICZM in System for the Sustainable Management of Floating Net Cage Grouper Cultures (SYSMAR) DSS was applied to identify the suitable sites for sustainable future development of mariculture in Galang Island, Riau Province, Indonesia.The SYSMAR DSS is integrated in a graphical user interface and the system has been successfully applied to a large number of coastal sites in Indonesia [3,4].

Sources of Data
The required data for the application of the DSS is obtained from several sources.Bathymetric data along near shore areas in Indonesia is usually obtained from nautical charts issued by the Badan Koordinasi Survey danPemetaanNasional (National Coordinating Agency for Survey and Mapping).General Bathymetric Chart of the Oceans (GEBCO) data, issued by the British Oceanographic Data Centre, U.K. [13] is adopted to provide information in deeper areas.The data is provided on a horizontal grid with a resolution of 30 arc-second intervals or about 0.5 nautical miles.For tidal variations and wind characteristics for diving, the numerical models are extracted from Egbert and Erofeeva [14] and National Centers for Environmental Prediction and the National Center for Atmospheric Research (NCEP/NCAR) reanalysis database [15].Water quality information is obtained from Coral Reef Information and Training Centers (CRITC, LIPI) [16], Pusat Penelitian and Pengembangan Geologi Kelautan (Research Development Centre of Ocean Geology, RDCOG) [17] and Schlitzer [18].
Problems resulting from conflicts of coastal area utilization and adverse natural environmental conditions are also accounted for in the selection of suitable sites.For this purpose, geographic data is collected to identify the most relevant problems in the coastal zone.In this case, specific uses are assigned to identify a coastal area and the associated potential risks.The initial analysis is based on regional planning data of National Development Planning Agency [19] and Sahalo [20].On the basis of this analysis, the most relevant information for the conditions under investigation is selected.Due to the fact that information on current velocities and waves are seldom available, models for the simulation of flow and waves are usually set up for the coastal areas under investigation.

Analytical Framework
Whole data gained are assimilated in a Geographic Information System (GIS) and processed by an analytical framework proposed by Windupranata [21].As a result, an overview of the degree of capability and suitability criteria for development of floating net cages (FNC) Grouper culture within the entire chosen domain is provided.The adopted GIS approaches rely on a simple overlay of processes.In this way, the areas considered suitable for supporting the use of the proposed resource are identified with suitability factors weighted equally across categories.Thematic grids are prepared using GIS tools and reclassified according to the suitable criteria (see Figure 1).Three categories representing unsuitable (=0), allowable (=1), and optimal (=2) conditions are considered.An example of a reclassification process of bathymetric information is presented in Figure 1a.The figure illustrates the approach adopted in the classification of the bathymetry on the basis of minimum water depth.Once a grid cell is unsuited due to the fact that it is outside the recommended range, the overall score is turned into unsuited (0) (red color).By overlapping the information from all the thematic map final scores are allocated, as shown in Figure 1b.

Site Selection
Appropriate sites is determined with respect to surrounding conditions affected, along with the farmed stock to reduce the potential risks of floating net cage (FNC) Grouper farms.The selection of sites is based on spatial information of an array of parameters due to the suitability (biophysical parameters) and feasibility analysis (extrinsic aspects: coastal usage/ICZM).As can be seen in Table 1, in order to determine the suitability of a site, a number of parameters and criteria affecting FNC Grouper culture for South East Asian farm practice were selected [23][24][25][26].Table 1 lists the parameters adopted with the associated qualifications allowing for a ranking regarding the conditions of a predefined culture type and species.The condition of the bathymetry with respect to Indonesian Nautical Chart number 42 [28] can be seen in Figure 2. Generally, the sea water in the vicinity of Galang is categorized as a shallow area which is surrounded by coral reef.The depth of seawater in the vicinity Galang Island is mostly less than 15 m, only the Eastern area has a depth of about 25 m (see Figure 2).

Galang
According to the Coral Reef Information and Training Centers (CRITC) [16] dissolved oxygen concentrations are in the range of 6.9 -8.[17] revealed that nitrate concentrations were in the range 0.002-0.078mg/l, and nitrites were between 0.002 and 0.431 mg/l.Characteristic turbidity values are about 8 mg/l.On the basis of the information available, the water quality in the surrounding area of Galang Island is acceptable for FNC Grouper culture development.The attention should be paid to oxygen concentrations.
Data from the National Development Planning Agency (NDPA) [19] was collected to assess the ICZM criteria near Galang Island.Information was gathered of villages, tourism, semi intensive hatcheries or mariculture areas, traffic lanes, coastal usage for strategic areas, as well as environmentally protected areas (coral reef region).The sea covers 96% of the total area of the territory of Sub District Galang.This makes it very favorable for developing mariculture activities, including hatchery cultivation, and Snapper fish farming, seaweed cultivation and floating net cage (FNC) farms cultivating Groupers.However, current development is quite slow.

Results
The performance of an implementation of the ICZM in DSS will be presented.Through the use of a geographic information system (GIS) as a spatial planning tool, this DSS is able to assist in site selection as has been shown by a number of previous authors [3,4,12,21].
A comprehensive site suitability and capability map which integrates all of the selected criteria was edited using 32 parameters identified in Table 1.In order to assess the relative impacts of each category of parameters (e.g.physical, chemical, and ICZM) on the DSS result, the suitability maps of the three applied categories are presented in Figure 3. Locations are selected based on the suitability and sustainability consideration of each weighted parameter.Thus, the inputs and results of the DSS are designed to investigate, estimate, and correlate the information from different sources available in the database.When using DSS, data input or analysis types are selected by the user through the interface that controls the type of analysis to be made by the model components of the DSS.
Data analyses by SYSMAR DSS site selections in the Galang Island area are presented in Figure 3. water depth is allowable, whereas 67.4% (21612 Ha) areas in the vicinity of Galang Island are optimal for FNC Grouper culture.Figure 3b shows a suitability map in the vicinity of the Galang Island based on maximum water depth.It shows 80.6% (25857 Ha) of the area was considered as optimal, and only 10.3% (3298 Ha) as unsuited area.Considering the flushing rate, only 0.3% (90 Ha) of the area in the vicinity of Galang Island area is identified as unsuited for mariculture activities (see Figure 3c).Areas representing optimal and allowable conditions cover 54.5% and 45.3%, respectively.Figure 3d presents the suitability map based on exposure to currents, it shows about 11859 Ha (37%) and 20000 Ha (62.3%) exhibiting allowable and optimal current velocities, respectively.Only 0.7% (221 Ha) of the area is defined as unsuited.The maximum waves resulting from the simulations of the Galang Island model are displayed in the map of Figure 3e.It shows that all of the area is defined as suitable location.Furthermore, the suitability map in the vicinity of the Galang Island based on exposure to wind clearly shows that the whole area is suitable for FNC Grouper culture activities (see Figure 3f).The maximum wave height is lower than 0.8 m.Within a maximum wind speed of less than 7.3 m/s and fetches not exceeding approximately 70 km length, the wind generates an average maximum wave height of about 0.4 m.This condition implies that the area is clearly suitable for FNC activities.
As shown in Figure 3g, to study chemical parameters such as water temperature, salinity, dissolveed oxygen, pH, and water transparency, data of water quality were adopted from CRITC [16].Other parameters, such as turbidity, ammonium, nitrate and nitrite were taken from the Research Development Centre of Ocean Geology Bandung [17].The phosphate map of the area is taken from Diansyah [30].The result of the suitability map based on water quality in the vicinity of Galang Island shows that the total area is suited for FNC Grouper culture activities without restrictions.
A suitability map based on the ICZM in Galang Island is indicated by sixteen thematic maps, covering buffer zones of more than 200 m to other coastal usage properties.The thematic maps consist of villages, towns, cities, harbours, streams, rivers, erosive shoreline, semi intensive hatcheries, ponds, sewage discharges, traffic lanes, and coastal usage.
To analyze land use for coastal utilization in Galang Island, The Author found a large quantity of data and applied it by using a graphic user interface of SYSMAR DSS.As can be seen in Figure 4, of 16 parameter criteria, only 8 main criteria are detected which imposed restrictions on FNC Grouper develop-ment, such as villages (indicated by number 1), strategy or industry areas located in the north and south domain (shown by number 5), and tourism areas located on the west part of domain (see number 6).Rivers can also be found spread over the domain (see number 8), semi intensive hatcheries and pond areas which the government had planned to extend (number 10), traffic lanes (number 14) and the environmentally protected area including mangrove zone and coral reef areas (number 16).The analysis of computing ICZM is carried out by adopting data from the master plan of Batam City for 2004-2014 from National Development Planning Agency [19], Sahalo [20] and Indonesian Land use Data Bank [31].Figure 5 presents an area of 77.5% or about 24,856 Ha of seawater areas being defined optimal, and only 22.5% of the area are categorized as unsuited.This study applies the SYSMAR DSS for ICZM and has the ability to integrate the multidisciplinary environment as a complex and variable system.However, the result must be interpreted with caution, because Ferrol-Schulte et al. [32] revealed that the researchers and practitioners have been blurring the boundaries between conservation, development, poverty-alleviation and natural resource ecosystem management in Indonesia.The final result of the suitability map from all parameters in the vicinity of the Galang Island can be seen in Figure 6.It shows about 12940 Ha (40.3%) of the seawater area in Galang Island are interpreted as suited area.The areas are spread over the vicinity of the Galang Island.The DSS is an approach to support decision making through the screening of data.The scoping of stakeholders and the scanning of development strategies are found to expand FNC Grouper culture in the vicinity of Galang Island.

Discussion and Conclusion
The aim of this manuscript was to demonstrate the application of the ICZM in DSS for the sustainable management of FNC Grouper cultures.The work is focused on the improvement of ICZM to incorporate the EAA concept of the physical carrying capacity (CC) for sustainable FNC Grouper cultures in Indonesia [33,34].[16] who found that sea water quality in the area surrounding Galang Island sub district including Abang Island, Air Saga, Petong Island, Nguan Island, Sembur Island, Karas Island, and Mubut Island were suitable for grouper culture activities.The present findings of SYSMAR DSS seem to be consistent with earlier observations which showed that water quality in the vicinity of Galang Island is suitable for the development of FNC Grouper projects.
In order to analyze land use for mariculture and coastal zone utilization, Stead et al. [35] and Nurhidayah [5] found complex problems, such as coastal environment degradation and resources depletion, land based marine pollution and overfishing, utilization conflicts of marine space (marine conservation, tourism, mariculture, industry, ports, access for local people) and overlapping and conflicting laws regarding marine and coastal management.New perspectives on the sustainable use of coastal areas and natural resources were reported by Burnell et al. [2].Farhan and Lim [6] revealed that the DSS for Integrated Coastal Zone Management can be used to solve the issues of multiple decision makers and has the ability to integrate multi-disciplinary studies of economic, social, and environmental sustainability in mariculture.An implementation of the comprehendsive ICZM is shown in this study.It is interesting to note that among all 16 parameters of ICZM SYSMAR DSS criteria, half of those parameters including villages, industry, tourism, rivers, pond/ semi intensive hatcheries, traffic lanes, coastal usage, and environment protected area are seen to affect the size of the area considered suitable for FNC development.The analysis shows that 77.5% of the area or about 24856 Ha can be defined as an optimal area for FNC Grouper culture with regard to ICZM criteria mentioned in Table 1.
Thus, the present study highlights that physical carrying capacity is obtained from the site selection of SYSMAR DSS implementation with respect to the results of the high resolution of the hydrodynamic and wave numerical model, water quality, and integrated coastal zone management (ICZM).Finally, it demonstrates that about 40.3% (12940 Ha) of the seawater area in the vicinity of Galang Island are estimated as suitable area.

Figure 1 .
Figure 1.Scheme of the Suitability Assessment: a) Reclassification of Bathymetric Information b) Estimation of a Final Score Using an Overlay Procedure [22].
Island (0 o 45'N 104 o 15.1E)Regarding Act no. 25 in 2002[27], Riau Archipelago has become the 32 nd Indonesian Province.Galang Island is located in this province and covers an area of about 80 km 2 .It is located in the Southern part of the Malacca Strait, in the Southern part of the South China Sea, and about 40 km Southeast of Kota Batam.The island is currently under the administration of Galang Kota Batam District, Batam City, Riau Archipelago Province.The sub district Galang comprises 120 islands covering the total area of 14,610 km 2 .Only 36 islands are populated.About 14,600 inhabitants live in Galang Island[20].

Figure 3 .
Figure 3. Site Selection for Sustainable Mariculture in the Vicinity of Galang Island

Figure 5 .Figure 6 .
Figure 5. Suitability Map in the Vicinity of the Galang Island based on ICZM
The sea water temperatures vary between 26-29 o C. Characteristic pH values of 8.20-8.80 were observed in the area.Water clarity which was indicated with secchi depth ranges from 2.5 to 10 m.The average current velocities range from 0.2 to 0.4 m/s.The Research Development Centre of Ocean Geology [16]d 2.8 m[29].Field measurements carried out at several locations in the Galang subdistrict from May to November 2009 by the CRITC, Indonesian Institute of Science (LIPI), resulted in recorded tide heights of around 1.2-1.5 m.According to CRITC[16], dissolved oxygen concentrations are in the range of 6.9-8.2 mg/l.Salinity ranges from 32-35 psu.