Environmental Suitability for Sea Ranching Harvest Type of Sandfish Sea Cucumber Holothuria Scabra Jaeger 1833 in Karimunjawa National Park, Indonesia

Abstract

Holothuria scabra Jaeger 1833, known as sandfish visually, Its visible external body has a soft, flexible texture. Sandfish is included in the Echinodermata phylum and Holothuroidea class, which has an important ecological and economic role. This research proposes to decide the suitability site in an intermediate culture model of sea ranching harvest type based on ecological, socio-cultural and Karimunjawa National Park zoning plan. Data collected has done in March 2020, November 2020 and August 2021. The data analysed on the environmental suitability level was based on several essential criteria matrices used by ArcGIS 10.8.2. They were four classes performed (high suitable, suitable that is enough, suitable with conditionals, and not suitable) based on each variable and matrix classification from main factor (6 variables), supporting factor (5 variables), dan another factors (1 variable). The highest score was 35, and the lowest was 23 during the class interval value. The analysis showed that the aquatic environment that was High Suitable (S1) for sandfish life was Gede Lagoon. It has been determined to be highly suitable for developing sandfish cultivation. Furthermore, the Sea Ranching Harvesting Type development would recommend being carried out in waters that do not have limiting factors.

Analysis of potential lobster artificial reef sites in Gerupuk Bay waters of Central Lombok, West Nusa Tenggara

“…The reef fish species composition was calculated in individual/meter per square. Coral colonies' percentage of benthic lifeform coverage was grouped into thirteen based on the output of category benthic lifeforms [34] developed and modified by the Indonesian Research Centre (LIPI) [19,37]. Coral health analysis was performed according to coral health quality by [37] on criteria standards for damaged coral reefs.…”

“…Coral colonies' percentage of benthic lifeform coverage was grouped into thirteen based on the output of category benthic lifeforms [34] developed and modified by the Indonesian Research Centre (LIPI) [19,37]. Coral health analysis was performed according to coral health quality by [37] on criteria standards for damaged coral reefs. Meanwhile, descriptively analysed, the environmental quality data averaged with the study results [22,23].…”

“…Water quality parameters were analysed to establish a suitability matrix compiled through a literature review so that the limiting parameters required for cultivation and cage culture activities can be seen. Water environment data before further analysis is performed by standardization [38,37]. The data normalisation technique used the 1 to 3 range to convert all data from different scales to the standard scale [38].…”

“…The class was "high fit" (S1), the class was "suitable that is enough" (S2), the class was "suitable with conditionals" (S3), and the class was "not suitable" (N) [37], and rely on the previous studies literature based on quality range value references (Table 1). Analyse to determine among suitable class intervals, the following formula was used [39,40,37]: I = ((Nmax-Nmin/K)), where: I is the class interval; K is the desired land number of suitability classes; N max is the maximum final value; Nmin is the minimum final value. Further, the class intervals and fitness values are obtained based on the above formulas and calculations in Table 1.…”