Kelimpahan plankton pada budidaya udang vaname (Litopenaeusvannamei) dengan kepadatan berbeda di tambak lahan pasir

Abstract

ABSTRAK Penelitian ini bertujuan mengestimasi kelimpahan dan kestabilan perairan tambak melalui pengukuran indek sbiologi (keanekaragaman, keseragaman dan dominansi plankton) di tambak intensif dengan kepadatan berbeda. Percobaan telah dilakukan menggunakan 9 petak tambak dengan ukuran 3x4m 2 (12m 2). Percobaan dirancang dalam 3 perlakuan padat tebar berbeda(100, 200 dan 300 m 2) yang diulangi sebanyak 3 kali. Periode pemeliharaan udang selama 75 hari dengan mengukur indeks biologi plankton (keragaman, keseragaman dan dominansi). Pengamatan dilakukan di laboratorium terhadap kelimpahan jenis plankton dan parameter fisika-kimia air dilakukan terhadap suhu, kecerahan, pH, salinitas dan DO setiap hari. Sedangkan nitrite, nitrat, amonia dan BOT diamati setiap dua minggu. Analisis dilakukan terhadap indeks keragaman, indeks keseragaman dan indeks dominansi plankton di tambak. Ditemukan 5 genera dan 18 spesies pada tambak lahan pasir. Kelimpahan terbanyak didapatkan pada genera Chlorophyta dan Bacillariophyta. Indeks keragaman plankton relative sama pada ketiga perlakuan (0,11-0,35), indeks keseragaman sebesar 0,04-0,12 dan indeks dominansi sebesar 0,85-0,97. Indeks keragaman dan keseragaman relative rendah, meskipun demikian, indeks dominansi plankton relative stabil. ABSTRACT This study aims to estimate the abundance and stability of pond waters by measuring the biological index (diversity, uniformity, and plankton dominance) in intensive ponds with different densities. Experiments were carried out using 9 pond plots with a size of 3x4m2 (12m2). The experiment was designed in 3 different stocking density treatments (100, 200, and 300 m2) which were repeated 3 times. Shrimp rearing period for 75 days by measuring the plankton biological index (diversity, uniformity, and dominance). Observations were made in the laboratory on the abundance of plankton species and the physico-chemical parameters of water were carried out on temperature, brightness, pH, salinity, and DO every day. Meanwhile, nitrite, nitrate, ammonia, and BOT were observed every two weeks. The analysis was carried out on the diversity index,