Abstract

The construction of fish shelters is one of the efforts to support the achievement of Sustainable Development Goals (SDGs) point 14: Life Below Water, which emphasizes the importance of preserving marine ecosystems and ensuring the sustainable use of aquatic resources. This study aims to analyze plankton abundance and water quality parameters before and after the placement of fish shelters in Nepa Waters, Banyuates District, Sampang Regency, Madura. Samples were collected at three observation stations before and after shelter installation and were then analyzed using statistical tests. Plankton identification revealed 5 classes: Chlorophyceae, Cyanophyceae, Bacillariophyceae, Branchiopoda, and Oligohymenophora. Plankton abundance before placement at stations 1,2, and 3 was 106, 420, and 427 ind/L, respectively, while total abundance increased after placement to 564, 758, and 489 ind/L. The diversity index (H') before placement ranged from 0.3-1.18 (low category) and increased afterward to 1.23-1.57 (moderate category). The uniformity index (E) ranged from 0.19-0.64 before placement and 0.62-0.68 after placement, both falling into the moderate category. The dominance index (D) was 1, indicating high dominance. Water quality parameters before and after shelter installation showed the following ranges: Temperature 30.1±0.058 - 31.7±0.12°C and 29.9-31.3°C; Transparency 35.3-100% and 43.53-100%; Light intensity 1 lux; pH 7.2±0.033 - 7.6±0.067 and 8.3±0.083 - 8.4±0.046; DO 8.1±0.033 - 8.6±0.033 mg/L and 5.4±0.285 - 7.1±0.088 mg/L; Salinity 35-37 ppt and 32-34 ppt; Nitrate 1.973±0.029 - 2.533±0.282 mg/L and 1.125±0.05 - 1.423±0.116 mg/L; Phosphate 0.228±0.006 - 0.557±0.092 mg/L and 1.05±0.014 - 1.16±0.047 mg/L.