Officials in Taoyuan, Taiwan, have stepped up measures to contain an outbreak of tilapia lake virus (TiLV), which has so far infected seven fish farms in the northern municipality, reports Focus Taiwan.

Taoyuan's Department of Agriculture said Tuesday it has urged tilapia fish farms to purchase their fish fry from reputable suppliers, raise them and observe their condition in isolated ponds for at least two weeks before moving them to regular ponds, and prevent mixing them with fish from unknown origins.