• Costa Rica Coffee Guide

Researchers spot giant sharks in Costa Rica

March 13, 2009

Researchers with the ocean conservation organization PRETOMA were pulling in their fishing line when they realized they had caught a little more than they had bargained for: what is believed to be a bull shark measuring approximately four meters (13 feet) in length.

“It was very close to the surface. We were pulling it in when the line broke,” said Allan Bolaños, a researcher who was aboard a boat about two kilometers off the coast of the southern Pacific Osa Peninsula when he and others spotted the massive shark.

Bolaños and a group of researchers were in the region to capture bull sharks in order to outfit them with tracking devices in order to study their movements. The fishing lines the scientists were using, however, were no match for the largest of these sharks, PRETOMA said in a statement released last week.

“Many of the hooks and steel leaders were mangled, destroyed, or simply bitten off by the large animals, only one of which came close enough to our fishing vessel for us to take a glimpse of its amazing size, before it too broke free,” said Randall Arauz, the expedition´s scientific director.

Bull sharks, particularly juveniles, are known to swim up freshwater rivers in search of food and protection. According to National Geographic, bull sharks have been seen far up the San Juan River, which forms Costa Rica´s northern border with Nicaragua, and are believed to inhabit Lake Nicaragua, the river´s source.

On average, bull sharks range between 2.1 and 3.4 meters, and are classified as “near threatened” by the International Union for the Conservation of Nature (IUCN).

As part of t he Bull Shark Tagging Project, t he researchers captured and tagged four juvenile bull sharks measuring approximately one meter in the brackish waters where the Sirena River meets the ocean, at the edge of Corcovado National Park. Bolaños and others are studying the movement patterns of the sharks in the hopes of expanding the national park´s boundaries to cover more of the sea.

Currently, Bolaños said, the park´s protected status extends 500 meters into the ocean, an area where fishing is prohibited. The four-meter bull shark was spotted two kilometers from shore.

The research project is funded by the Whitley Fund for Nature (WFN), the BBC Wildlife Fund, and corporate sponsors through PRETOMA´s Corporate Membership program.

You may be interested

Slothy Sunday: End your February with a sloth
Sloth Sundays
2536 views
Sloth Sundays
2536 views

Slothy Sunday: End your February with a sloth

The Tico Times - February 28, 2021

Happy Slothy Sunday from Costa Rica! We hope you enjoy the rest of your weekend, and the end of February…

How can I immigrate to Costa Rica?
Business
71 views
Business
71 views

How can I immigrate to Costa Rica?

Lic. Jorge Montero B. - February 28, 2021

Back in September 2016, when we lived in a completely different social environment, not yet affected by the global pandemic,…

Central America begins ban to protect lobster
Fishing
1707 views
Fishing
1707 views

Central America begins ban to protect lobster

AFP and The Tico Times - February 27, 2021

Countries of Central America and the Dominican Republic on Monday will begin a ban to protect the Caribbean spiny lobster…