A drought in Puerto Rico has killed thousands of fish in one reservoir.

The secretary of the Department of Natural Resources, Carmen Guerrero, said more than 8,000 sardines were killed in La Plata reservoir as a result of dwindling water levels, Yahoo News reported. The fish died in the northern town of Toa Alto due to lacking oxygen.

Guerrero said she fears more fish will start dying if the drought situations continue to worsen.

In the past two weeks, the number of Puerto Rican municipalities facing severe drought has doubled. As a result, the government has imposed strict water rationing measures and is beginning to fine people for improper water usage.

More than 1.8 million people in Puerto Rico are affected by the drought.

The U.S. Drought Monitor gives a weekly update on drought situations in Puerto Rico. Currently there are large portions of the island that are facing abnormal drought, moderate drought and extreme drought.

The island is known for its abundance of freshwater and saltwater fish, according to PuertoRico.com. The commonwealth is home to natural lakes, man-made lakes, rivers and seas that are home to various fish species.

Each year, the island of Puerto Rico attracts thousands of visitors who come to fish in various ways. The popular activity attracts people who want to go fly fishing, deep sea fishing, sport fishing, tarpon fishing and more. There is a large variety of fish species on the island including Tuna, bonefish, Blue and White Marlin, and Mahi-Mahi fish. While people come to fish, they also enjoy other water activities like snorkeling and scuba diving.

According to the website, there are 20 man-made lakes in Puerto Rico that are regularly stocked with fresh water fish.

It is not clear if the drought situations will get better soon.