Does Expired-Larvicides Impacted to Plankton Abundance and Diversity?

Abstract

The using of chemical insecticides for controlling Aedes aegypti can cause mosquitoes resistant to insecticides. One of the natural insecticides commonly used in controlling Ae. aegypti is Bacillus thuringiensis israelensis (Bti). Bti has been proven effective as larvae of the Ae. aegypti, but its effect on non-target organisms such as plankton is not well known. The purpose of this study was to determine the effect of Bti on plankton abundance and diversity index as a non-target organism. The study was conducted at the Laboratory of Aquatic Molecular Biology, Department of Biology, Faculty of Mathematics and Natural Sciences, the University of Lampung during April 2019 to June 2019, a completely randomized design (CRD) with Bti concentrations of 0 ppm, 20 ppm, 40 ppm, 60 ppm, 80 ppm 100 ppm and Bti expires 20 ppm with 4 replications. Parameters observed were plankton abundance and diversity index and water quality after larvicide treatments on the 5th day. Data was Analysis of Variance (ANOVA) at α = 0.05. The results showed that Bti treatments did not have a significant effect (p> 0.05) on plankton abundance and diversity index at different concentrations, so it's safe to use in the shrimp pond area.

KEANEKARAGAMAN TEMPORAL PLANKTON SEBAGAI BIOINDIKATOR KUALITAS LINGKUNGAN DI AREA TAMBAK BUDIDAYA UDANG VANNAMEI (Litopenaeus vannamei)

“…Sampel yang telah dikumpulkan di fikasi dengan larutan yodium lugol untuk kemudian diamati maksimal 4 jam dari waktu pengumpulan (Lyu et al, 2021;Casé et al, 2008). Sampel diamati dilaboratorium menggunakan haemocytometer dan mikroskop dengan pembesaran 10 x 10 untuk mengatahu jenis dan kelimpahan yang didapatkan untuk selanjutnya dilakukan analisis indeks biologi (Khasanah et al, 2019).…”