[All links lead to sites in Spanish unless otherwise stated]
Dolphins  [en] are among the most intelligent creatures on the planet, found in almost all the oceans in the world and with very few natural predators. In Peru they are found  along various sections of the coast, including Lima's beaches where they swim alongside surfers , in the Paracas National Reservation , or on Piura's coastline, in the north of Peru, which is a spot  also enjoyed by humpback whales.
This is the reason the news  that in the first part of this year 3,000 dolphins have been found dead along the north coast of the country has caused such astonishment. Carlos Yaipén-Llanos, director of ORCA  [Scientific Organisation for Conservation of Aquatic Animals], a Peruvian marine life conservation organisation, points out  that these deaths are the result of “an acoustic impact that is created by deep-sea equipment used for the detection of oil, gas and other minerals”.
The director of ORCA also reveals that it has been deduced from the forensic analises of the dolphins that they suffered from “acute decompression syndrome evidenced by fractures in the periostial bones and hemorrhaging in the middle ear, disseminated pulmonary emphasema, and air bubbles in organs such as the liver, kidneys and blood vessels”.
A subsequent newspaper report mentions  that it is the use of exploration technology known as Sísmica 3d which causes the acoustic impacts that affect the dolphins. The company BPZ  [en], based in Tumbes (to the north of Piura), is using this form of exploration to gather information on oil and natural gas deposits. This company has denied that their research causes the deaths of marine species, but the report on environmental impact indicates that this technology does have  its consequences.
President of the Congress Daniel Abugattás has declared  his hopes that the ministers of environment, production, energy, and mining inform the Peruvian parliament about this case. Another source suggests  that it is IMARPE , the Instituto del Mar del Perú [Peruvian Sea Institute], that should release an official report on the matter.
Hardy Jones, the founder of BlueVoice.org  [en], filmmaker and activist for the conservation of marine life, went  to Peru to experience Dr. Yaipén-Llanos’ primary reports of the 25th March. Already on Peru's northern coast, he tweeted  [en] on the 27th March:
Found 615 dead
#dolphins  on 135 kilometers of beach N of San Jose, Peru. Tragedy unspeakable. Please retweet. This must be investigated.
On his personal blog he describes  [en] in greater detail how he found out about these events, his trip to Peru and what he saw there:
Carlos and his team performed necropsies on a couple of the dolphins. Seeing a new born common dolphin, umbilicus still attached was wrenching.
We raced along the hard sand at the edge of the surfline crying out when we saw a dead dolphin. At first they came every couple minutes. But then we’d hit intervals when the cries would go “dolphin! Delphin! Otro! Dos mas! There’s another one up by the dune.”
Later he posted  [en] part of Dr. Yaipén-Llanos’ report on BlueVoice's blog:
As previously reported, two species have been affected: Long beaked common dolphin (Delphinus capensis) and Burmeister’s porpoise (Phocoena spinipinnis). We counted 615 common dolphins. All age classes were affected: Adult males, females, lactating females, juveniles, calves and newborns. We counted 19 porpoises, only females and calves.
ORCA has shared photos  on Facebook of their findings. Dr. Yaipén-Llanos was interviewed  on Spanish CNN about the events. The following video  [en] is part of Hardy Jones and Carlos Yaipén-Llanos’ journey along the coast of Northern Peru:
Meanwhile, environment and fishing ministers met  on the 10th April to report on the link between oil exploration and the deaths of the dolphins. They also had to report on the measures being taken to avoid greater environmental impact on marine fauna, now that a report has shown that approximately 20,000 dolphins, as well as other species, are in mortal danger. Inquiries into the use of Sísmica 3d have been planned  along the entire Peruvian coastline.