Teiah dilakukan pemeriksaan •toksisitas 18 ekstraketanol dari 4 tumbuhan pengganggu dan 6 bakauyang diduga dapat dimanfaatkan sebagai obat.. Pemeriksaantoksisitas ekstrak dengan dosis 1 mg/mi dan0,1 mg/ml ditentukan inenurut metode Meyer yang dimodifikasimenggunakan Artemia saUna Leach benumursatu minggu. Pengamataniumiah Artemia sauna Leachyang mati dengan dosis ekstrak 1 mg/ml di].akukansetiap 30menit selama 6 jampertama dan pada jamke 24 seteiah pemberian - ekstrak. Sedangkan untukdos is 0,1 mg/ml diamati setiap jam selama 6 jampertama dan pada jam ke 24 seteiahpembenian ekstrak.Hasi]. pengamatan menuniukkan ada 4 ekstrakyang menyebabkan 95 % kematian, i1 ekstrakmenyebabkanprosentasi kematian antara 10 - 86%, sedangkan3 ekstrak tidak rnenyebabkan kematian.

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Toxicity studies were performed on 18 ethanol-

Ic extracts of 4 weeds arid '6 mangrove plants which

were believed to be active as medicines using a urndif

led Meyer's methode. One week oldArtemia sauna

were exposed to plant extracts of 'l mg/ml and 0,1

mg/ml for 24 hours.Observations were done by counting

the number Of death shrimps each 30 minutes In

the-first 6 hours and after 24 hours for extracts

of 1 mg/ml and every hour in the first 6 hours and

after 24 hours for extracts of 0,1 mg/ml.-The resuits

showed that . 4 extracts caused 95% killed, 11

extracts caused 10 - 86% killed and 3 extracts did

0 not show any effect.