Segara Anakan Lagoon (SAL) as the specific ecosystem is arranged by the mangrove ecosystem and lagoon ecosystem. The mangrove ecosystem in SAL needs high adaptation to reduce the impact of water tide, water inundation, water salinity, and other factors. This research aimed to analyze mangrove clustering in Segara Anakan Lagoon. The method of this research used Hierarchical Clustering Methods based on mangrove density to analyze cluster adaptation of the mangrove ecosystem. The result showed that (1) The mangrove density (diameter > 4 cm) to analysis mangrove clustering showed that East Segara Anakan had density between 900 – 5425 trees ha-1 (low-very high density ) and West Segara Anakan had density between 133 – 3.367 (low – high density). (2) the mangrove clustering showed that West Segara Anakan had three clusters. The first cluster was arranged by clustering of stations {((15.18),(9.17),(3.6)),8)); ((1.2),5)}. The second cluster was arranged by clustering of stations {(((4.10),14,12))}. And the third cluster was arranged by clustering of stations{(((11.20)16));(7.19))}. (b) East Segara Anakan also was formed by three clusters were the first cluster was formed by clustering of stations (2-(((4, 13), 6) ((1.12), ((4.13) ((5.10) (7.11)))) The second cluster was arranged by clustering of stations (9; ((8.15), (19, (20.21)))) The third cluster was formed by clustering of stations (18 (17, (14,16))).

North Jakarta is widely used for various activities including industry, settlement, transportation, tourism and others. North Coast Jakarta also has high probability of coastal disaster including high tidal flooding which is caused by sea level rise, mangrove degradation and geomorphologicly area. This paper aimed to analysis the potential of high tidal flood using mapping analysis and mangrove density relationship. Mapping analysis and mangrove ecosystem relationships were used to analyzing the potential for tidal flooding. Data showed the density of mangrove ecosystems reaches 220-1100 trees ha−1, a single daily tide, sea level reached 2.75m, sea level rise reached 2.74m (the rate reached 0.71 cm/year), tidal flooding to reach an area of 1014.69-1548.91 ha and land subsidence reach 12 cm/year

The aim of study is to analyze Length-Weight Correlation [LWC] and Condition Factor [CF] of wild spiny lobster juvenile Panulirus spp. (Decapoda: Palinuridae) inhabit in Cilacap waters. Juvenile of spiny lobsters are collected by dives and lighted attractor as juvenile trap from August to October 2018. The spiny lobster juvenile from study site is collected and accommodated in stereo foam box containing sea water and aerated. The juvenile is transported to laboratory and kept in 50×70×50 cm glass box containing sea water, aerated and identified. Total of 231 spiny lobster juveniles were collected and identified were found three species, namely P. homarus (213 individuals), P. versicolor (9 individuals) and P, ornatus (11 individuals). Minimum of CLand weight were found 3.2 mm and 0.01 g; and maximum were obtained 21 mm and 0.52 g. The LWC juvenile was found strong relation and were close to 1. The CF Panulirus spp. juvenile was obtained 0.009865 ± 0.00409 and the CF of P. ornatus was the highest value [0.011218 ± 0.00406] than other species. The habitat of Cilacap coastal waters demonstrated more support to the growth of P. ornatus than the growth of P. homarus and P. versicolor.

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