Thresher sharks are key predators in the marine ecosystems of the Tropical Pacific Ocean, playing a fundamental role in maintaining ecological balance. They primarily feed on squid and small fish. This study aims to assess possible ontogenetic changes in the feeding habits and habitat use of two thresher shark species (Alopias pelagicus) and (Alopias superciliosus) inhabiting the Galápagos Marine Reserve (GMR), aspects that remain poorly understood in the region.

Environmental changes contribute to the arrival of non-native species and their pathogens in sensitive ecosystems such as the Galápagos Islands. This poses a significant risk to the archipelago’s unique species, including the Galápagos sea lion (Zalophus wollebaeki), an endemic and endangered animal that faces the threat of contracting diseases from introduced domestic animals.

The commentary on the article “Addressing illegal longlining and ghost fishing in the Galapagos marine reserve: an overview of challenges and potential solutions” by Alex Hearn and Santiago Bucaram questions the proposal to develop an open water tuna fishery, warning about the risks of legalizing harmful fishing practices for the marine ecosystem. Additionally, they analyze the challenges faced by the Galapagos due to the use of illegal longlines.