Pertumbuhan dan Kualitas Mikroalga Thalassiosira sp. yang dikultur dengan Penambahan Trace Element

Abstract

Thalassiosira sp. is a microalgae used in vanamei shrimp hatcheries. The objective of this study was to evaluate the effect of trace element (TE) supplementation on the growth and quality of Thalassiosira sp. microalgae. This research uses the Complete Random Design (CRD) with five fertilizer treatment formulations, including a control treatment without trace element supplementation and treatments with added trace elements. The treatments were as follows: concentration N = 13.56; P = 1.21; Si = 2.530; Fe = 0.103 (K); concentration N = 7.87; P = 0.40; Si = 3.96; Fe = 0.32 (F1); concentration N = 7.87; P = 0.40; Si = 3.96; Fe = 0.32 + trace elements (F1+TE), N = 11.80; P = 0.61; Si = 5.93; Fe = 0.48 (F2), and N = 11.80; P = 0.61; Si = 5.93; Fe = 0.48 + trace elements (F2+TE), with four replicates for each treatment. The concentration of F2 was 1.5 times higher than that of the F1 formulation. The highest cell density was obtained in the F1+TE treatment, but it was not significantly different from the F2+TE treatment. The specific growth rate of all treatments was higher than that of the control. The addition of trace elements was able to increase the density and quality of Thalassiosira sp. cells.

Thalassiosira sp. merupakan salah satu mikroalga yang digunakan pada hatchery udang vaname. Tujuan dari penelitian ini adalah untuk mengevaluasi penambahan trace element (TE) terhadap pertumbuhan dan kualitas mikroalga Thalassiosira sp. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) dengan lima perlakuan formulasi pupuk, yaitu perlakuan tanpa penambahan trace element dan formulasi dengan penambahan trace element. Perlakuan tersebut dengan konsentrasi N =13,56; P = 1,21; Si = 2,530; Fe = 0,103 (K), konsentrasi N = 7,87; P = 0,40; Si = 3,96; Fe = 0,32, (F1), konsentrasi N = 7,87; P = 0,40; Si = 3,96; Fe = 0,32 + trace element (F1+TE), konsentrasi N = 11,80; P = 0,61; Si = 5,93; Fe = 0,48 (F2), dan konsentrasi N = 11,80; P = 0,61; Si = 5,93; Fe = 0,48 + trace element (F2+TE) dengan empat ulangan untuk masing-masing perlakuan. Konsentrasi F2 lebih tinggi 1,5 kali dari formulasi F1. Kepadatan sel tertinggi didapatkan pada perlakuan F1+TE, namun tidak berbeda dengan perlakuan F2+TE. Laju pertumbuhan spesifik semua perlakuan lebih tinggi dibandingkan kontrol. Penambahan trace element mampu meningkatkan kepadatan dan kualitas sel Thalassiosira sp.