The Department of Fisheries estimates it will take three years to manage the population of invasive blackchin tilapia through genetic modification aimed at producing infertile offspring. Bancha Sukkaew, the department’s director-general, announced plans on Wednesday to genetically alter male blackchin tilapia so they can mate and generate fry incapable of reproduction. Starting no later than December, the department intends to release at least 250,000 modified males over 15 months. This method is anticipated to significantly reduce the invasive fish population within the specified timeframe.
In addition to genetic intervention, the department is addressing the issue by purchasing blackchin tilapia from the public at 15 baht per kilogram, a rate higher than market prices of seven to 10 baht per kilogram. Furthermore, efforts include promoting the consumption of dishes and fishmeal made from these fish. The department also plans to introduce predator fish species to prey on blackchin tilapia populations in affected areas.
Originally imported from Ghana in 2010 by CP Foods for research purposes, the blackchin tilapia are now widespread in various Thai provinces despite initial reports of their disposal due to high mortality rates. The fish’s presence has led to a decline in native fish populations, prompting concerns about ecological impact across multiple regions.
Local DNA tests have confirmed that all blackchin tilapia found in Thailand originated from the same imported stock. The fish have been reported in significant numbers in provinces such as Bangkok, Samut Prakan, Samut Sakhon, Samut Songkhram, and others including Chanthaburi, Rayong, and Songkhla.
CPF, the company responsible for the initial import, asserts it properly disposed of the fish in 2011 after their research program ended. However, recent reports indicate a resurgence in the blackchin tilapia population since 2017, raising questions about the ongoing ecological and regulatory challenges associated with invasive species management in Thailand.
