PORT-OF-SPAIN, Trinidad (AP) — Residents in Trinidad are demanding an independent investigation into a recent oil spill they blame for a fish die-off along the island's southwest coast.

At least one dolphin was earlier reported killed, and the call comes after another dolphin and more fish were found dead in the town of La Brea, which depends largely on fishing to sustain itself.

Legislator Fitzgerald Jeffrey told reporters Friday that he believes the government's response to the spill has been inadequate.

State-owned oil company Petrotrin has said that initial testing has identified no major contaminants following spills of at least 7,500 barrels of oil that occurred in December.

A full study by an independent lab is pending, and Trinidad's marine affairs institute also is investigating.