onca in numbers

In February 2006, Onca Explorations performed the first citizen science platform in Mazatlan waters aimed to obtain sightings and photoidentification records of cetaceans, particularly humpback whales and other marine mega fauna.

Through the documentation of whale and dolphin sightings during our ecotours, we aim to educate the public about marine ecology, biodiversity and the threats they face while creating a significant base of knowledge through citizen science in order to better understand the ecology and conservation needs of the cetacean community inhabiting the coastal waters of Mazatlán and southern Sinaloa. Our team is particularly interested in understanding trends in distribution, abundance and habitat use by cetaceans and other marine mega fauna in the area, and to assess its management and conservation needs.

In 2016 we celebrate 10 years of exploration in Mazatlan waters! Throughout an area of over 800 square kilometres on the continental platform of southern Sinaloa, we have performed over 1,300 cetacean surveys funded mainly by tourists and the general public: a bit over 10,000 participants to be precise! During over 5,000 hours at sea we have surveyed 36,000 linear nautical miles – that is like circling the globe around the equator 1.5 times!- and documented over 3,000 marine wildlife sightings, including up to up to 19 species of marine mammals, and a little bit over 2,700 hours observing cetaceans.

Our citizen science expeditions offer the opportunity for everyone to live a unique experience in nature while taking part in real wildlife monitoring programs along a team of specialists who act as guides and share their knowledge over ecosystems visited, species observed, techniques used in their study, and the importance of managing and conserving their populations. 

Oscar Guzón Zatarain, M.Sc.| CEO and owner.


photoidflukesBy taking photographs of natural markings, like nicks and scars on the dorsal fins of dolphins, or the pigmentation pattern on the ventral zone of humpback whale flukes; cetaceans can be identified to the individual level, in the same way fingerprints are used on humans. By building photo-identification catalogues, comparing them with those collected for other geographic regions, and applying certain statistical analyzes to our data, our team can begin to better understand the dynamic lives of whales and dolphins, including movement patterns, frequency and duration of their associations, patterns of residence and their abundance in the study area. Up to date, our humpback whale catalogue includes fluke photographs of over 1,500 individual whales! The analysis and shared used of these data sets is crucial in decision making for the development of proper conservation and management programs for this species in Mexico. 


This post is also available in: Spanish


La vida entre dos mundos: mamíferos marinos de Sinaloa

Con el trópico de Cáncer cruzándolo a solo unos ki

11 March, 2016 read more

Humpback whale mother and calf pairs early this winter season

Female Humpback whales are thought to reach sexual

15 January, 2013 read more

First recorded sighting of False killer whales in Mazatlan, Sinaloa.

On january 10th a thursday morning, our crew left

26 April, 2012 read more


In December of 2008, National Geographic´s TRAVELER Magazine, on its 10th edition for Mexico, published an article about research-based whale watching in Mazatlan with Onca Explorations.


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