Application of Principal Component Analysis to Characterize The Effect of Fishing Ground of Portunus pelagicus in Lancang Island Based on Environmental Parameters

Abstract

Abstract Crab is a high economic value fishery commodity that is third after tuna and shrimp. crab production depends on natural fishing. In the use of crab resources, it is necessary to understand several factors. Quantitative ecological analysis can be use Principal Component Analysis. This analysis divides the parameter matrix into several components, then compiles the diversity of components collected from the largest at the turn of the main component. Spatial distribution of physical and chemical parameters is obtained by following the findings of catching the crab. This paper tries to understand the suggested environmental parameters for the success of crab life. Water quality sampling was taken on June 2015 (representing the eastern season), with an average range according to the following: SST 27.89°C - 29.39°C, TDS 28.05 - 29.60 g / L, TSS 0.004 - 0.161 mg / l, brightness 1.37 - 5.45 m, DO 5.09 - 9.17 mg / L, salinity 29.8 - 31.70 psu, phosphate 0.013 - 0.09 mg / L, nitrate 0,0009 - 0,5 mg / L, bathymetry 2.3 - 30 m. The fishing ground of crab is in grid B, C and D. On-grid B there are grids B1, B3, and B4. Then on-grid C there is on grid C3 and C4. On-grid D on the D6 grid. The results of the analysis of the correlation matrix of aquatic biophysical parameters show that the variance in the main components of the five main axes is 85.7%. Thus, the four main components can explain 85.7% of all information available on all parameters. The parameters that have the highest contribution are salinity, TSS, DO, brightness, nitrate, and sediment. The highest contribution indicates the influence of these parameters on the presence of crabs in the waters of Lancang Island and its surroundings.