Abstract. Palupi M, Fitriadi R, Wijaya R, Raharjo P, Nurwahyuni R. 2021. Diversity of phytoplankton in the whiteleg (Litopenaeus vannamei) shrimp ponds in the south coastal area of ??Pangandaran, Indonesia. Biodiversitas 23: 118-124. Intensive shrimp farming in ponds is characterized by high stocking densities, complete feeding in quality and quantity, and good environmental control to produce the maximum quantity of shrimp in a fixed area. Phytoplankton is a bioindicator affecting the productivity of whiteleg shrimp in ponds. Currently, intensive shrimp farming activity is carried out on the south coast of Java, which utilizes sandy soil with a biofloc system, but the production has not been optimal. The objective of this study was to analyze the diversity and abundance of phytoplankton and water quality in the traditional and intensive whiteleg shrimp ponds in Pangandaran, West Java, to support sustainable pond management. The objective of the study was achieved by calculating the abundance, diversity index, evenness index and dominance index of planktons in intensive and traditional ponds. The study results showed that Chrysophyta division had the highest abundance and species number in both intensive and traditional ponds. The most abundant phytoplankton found in the intensive ponds was Halosphaera viridis (3143.88 ind/m3), and that in the traditional ponds was Rhizosolenia stolterfothi (1414.746 ind/m3). The phytoplankton diversity index (H') in the intensive ponds was 1.95 and that in the traditional ponds was 2.17. The dominance index value in the intensive ponds was 0.18 and in the traditional ponds 0.15. The abundance of phytoplankton is a limitation of the production success of whiteleg shrimp farming.

Kerapu Macan (Epinephelus fuscoguttatus) memiliki habitat asli di perairan laut dan merupakan ikan karang. Penelitian ini dilaksanakan di unit usaha kelola benih unggul Desa Klatakan, Pecaron Kabupaten Situbondo Jawa Timur. Populasi penelitian ini menggunakan 3 bak pemeliharaan larva dan 20 bak kolam pakan alami. Teknik pengambilan sampel dengan cara langsung dilapangan. Hasil penelitian menunjukkan bahwa Larva D2-D30 kerapu macan diberi pakan jenis rotifer  dengan kepadatan  3-10 individu/ml, Nauplius Artemia salina diberikan saat larva D 15 hingga D35 selanjutnya udang rebon diberikan pada saat larva D26-50.  Dosis pemberian VIT C 1%. Dosis pemberian baik untuk rotifer dan naplius Artemia salina adalah 0,6 ppt. Nilai HR (Hatching rate) telur mencapai 80%. Tingkat kematian tertinggi pada hari D3 sebanyak 50 %.

Perkembangan budidaya laut dari tahun ketahun terjadi peningkatan, usaha perikanan skala rumah tangga banyak berkembang di daerah pesisir Kabupaten Situbondo dikelola oleh pembudidaya ikan hanya atas dasar milik mereka sendiri modal dan pengalaman, tetapi tanpa mempertimbangkan keuangan aspek kelayakan bisnis dan konservasi lahan buidaya. Tujuan untuk mengetahui kelayakan usaha, volume dan nilai produksi budidaya kerapu cantang. Data primer dianalisis menggunakan analisis deskriptif dan analisis kelayakan bisnis melalui pendekatan kriteria investasi. Hasil penelitian menunjukkan bahwa Hasil yang didapatkan adalah  BEP unit: 265.506.000 ekor, BEP harga : 42.657.325 / tahun, B/C Ratio:  1,30 dan Pay back period 2,1.

The development of tiger grouper cultivation technology has not been maximally implemented so that the survival rate of fish is very low. The result is that it is very vulnerable to losses in cultivation. This study aims to analyze the profitability of tiger grouper hatchery. The research method used is a case study. Primary data is collected through observation, interviews, and questionnaires. Secondary data is data obtained indirectly. The calculated data analysis is the Benefit-Cost (B/C) Ratio, Break-even Point Analysis and Profitability. The results obtained are BEP in units is 170,606 heads and BEP in price is IDR 1,709,750, B/C Ratio is 1.65, and the payback period is 5 years 2 months.

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