Penambahan Tanaman Gamal Gliricidia sepium Terhadap Pertumbuhan dan Kelimpahan Plankton

Abstract

Kelimpahan pakan alami merupakan salah satu faktor penentu keberhasilan kegiatan budidaya ikan yang dapat ditingkatkan dengan penambahan pupuk organik. Balai Pengembangan Teknologi Perikanan Budidaya (BPTPB) menggunakan tanaman gamal sebagai alternatif pengganti pupuk organik. Tujuan dari kegiatan ini untuk menganalisis kelimpahan dan komposisi plankton terhadap pemberian tanaman gamal. Perlakuan terdiri dari empat perlakuan yaitu K (air 38 L + pupuk kotoran puyuh 4,18 kg), A (air 38 L + daun gamal dosis 4,18 kg), B (air 38 L + batang tumbuhan gamal dosis 4,18 kg), dan C (Air 38 L + daun dan batang gamal dosis masing-masing 4,18 kg). Penelitian meliputi persiapan wadah, persiapan pupuk, persiapan tanaman gamal, kultur pakan alami, serta pemanenan dan pemeliharaan pakan alami. Parameter yang diamati kelimpahan plankton, keseragaman, keanekaragaman, dan dominansi plankton, serta kualitas air. Hasil menunjukkan indeks keanekaragaman sedang 1,37–1,51, indeks keseragaman setiap perlakuan 0,85–0,94, dan indeks dominansi setiap perlakuan 0,24–0,30. Nilai kualitas air pada seluruh media perlakuan optimal. Perlakuan terbaik ditunjukkan pada perlakuan A dengan nilai kelimpahan plankton tertinggi (1917 ind L-1).

The abundance of natural feed is one of the determining factors for the success of fish farming activities can be enhanced by adding organic fertilizers. The Fisheries Cultivation Technology Development Center (BPTPB) uses gamal plants as an alternative to organic fertilizers. The purpose of this activity is to analyze the abundance and composition of plankton in relation to the use of gamal plants. Four treatments: K (38 L of water + 4,18 kg of quail manure fertilizer), A (38 L of water + 4,18 kg of gamal leaves), B (38 L of water + 4,18 kg of gamal plant stems), and C (38 L of water + 4,18 kg of both gamal leaves and stems). The research procedure includes container preparation, fertilizer preparation, gamal plant preparation, natural feed culture, as well as harvesting and maintenance of natural feed. The parameters observed in this plankton abundance, uniformity, diversity, plankton dominance, and water quality. Activity indicate a moderate diversity index of 1,37- 1,51, a uniformity index of 0,85-0,94, and a low dominance index of 0,24-0,30. The water quality values in all treatment media are optimal range. The best treatment is shown in treatment A with the highest plankton abundance (1917 ind L-1).