Protect Marine Ecosystems in Mexico

by Global Vision International Charitable Trust
Green turtle laying Chelonia mydas
Green turtle laying Chelonia mydas

Dear Supporter,

The turtle project is very busy at the moment with lots of turtle nests in San Juan and Yuyum Beaches. Every night we have approximately 8 turtles in San Juan and most nights two or three hatching nests. In Yuyum, during the inspection we had 5 or 6 new nests and about 8 to 10 nests to clean each week. 

During August we had found 199 nests of Chelonia mydas (Green turtle) and 68 of Caretta caretta (Loggerhead turtle) in San Juan, but on the 29th August when our partners helped out on a inspection in San Juan we found 136 extra nests and we cleaned more than 20, giving us a total of 403 nests in San Juan.

After the San Juan inspection, Flora Fauna y Cultura de México came back to base to help us with Yuyum, finding 76 nests and cleaning more than 15. Adding this to the 33 nests of Chelonia mydas and 20 of Caretta caretta that had been found before, we now have 129 nests in Yuyum.

With turtle season about to finish, we have had so far more than 2000 little turtles in our two beaches. We are very excited to see the final results of the season, and we feel very lucky to be able to contribute towards conserving the sea turtle species that nest it the region.

Thanks you for continuing to support this project.

All the best

GVI Mexico


Dear Supporter, 

One of the main objectives of Pez Maya marine conservation project is to collect data for the MBRS Synoptic Monitoring Program on behalf of our partners Amigos de Sian Ka’an (ASK) and CONANP. We train volunteers in four different MBRS methodologies, and when they complete their training they start to monitor. This quarter (April-June) we managed to complete five monitor sites for fish and coral.


  • To continue with the Mesoamerican Barrier Reef System (MBRS) Synoptic Monitoring Program in strategic locations in the north of Sian Ka'an reserve, to provide current information on the status of the reefs for management decisions.
  • To train participants in the expeditions in the MBRS methodology, through the identification offish, hard corals, invertebrates and algae.

The volunteers are trained in the four different methodologies of MBRS: Point Intercept method for percentage cover (PI), characterization of the Coral Communities (CC), and belt transect counts for defined fish species, adults and recruitments / juveniles. Volunteers go through extensive training both in and out of the water, learning Latin names for corals, conducting coral and fish identification tests, practice monitoring, sizing, laying lines, etc.  Training can take anywhere between 4-6 weeks depending on ability, logistics and weather.

Each quarter we aim to monitor as many sites as possible, and for the April to June quarter we were very happy that we managed to complete 5 out of 11 monitoring sites. It was really successful and a great occasion was when we had four different monitoring buddy pairs on one boat.


For the April- June quarter a total 5 sites were monitored from 11 sites: Pedro Paila 05 (PP05), Pedro Paila 10 (PP10), San Miguel de Ruiz 10 (SMDR10), San Miguel de Ruiz 20 (SMDR20) and Punta Yuyum 20 (PY20). Both coral and fish transects were completed at these sites. 

PP05 presents a high predominance of algae cover (74.50%) and a low percentage of hard coral cover (7.33%).

The dominant fish family is Acanthuridae with 84.55%, this is due to the higher number of individuals of blue tangs, ocean and doctor surgeon fish, which are most common in the reef. Also these species often travel and feed in schools which makes their presence in the transect higher. 

All the sites were done for both coral and fish giving us a clear idea of what is happening on the reef. Thank you for supporting this cause, your donations make all the above happen!

Thank you

GVI Mexico


Dear Supporter,

As fishing conservationists here at Pez Maya, we are quite worried about illegal fishing over the world, so it was a huge disappointment and concern to find an illegal fishing net 50m long right on our front beach this week.

Driving the boat out to one of our many beautiful diving sites this week we spotted a huge net stretching across the mangrove mouth, the point where the freshwater lagoons join the sea. It was obvious that this was carefully placed and as fishing with nets is outlawed within the reserve it was obvious that there was something ‘fishy’ going on!

Staff member Brad donned his snorkel gear and went down to investigate. After snorkeling the length of the net he confirmed our fears that there were quite a few fish stuck in the net. The net was made of thousands of small squares with floats on top and weights on the bottom, designed to catch anything and everything that swam into it. We were slightly comforted by the fact that no turtles had been trapped in the net because turtle egg laying season has begun in the reserve, so many turtles are traveling to the beach each night.

We threw the anchor out and after Brad cut the ropes tying it down we began to pull the net into the boat, carefully cutting out any fish that were stuck in the net. By now we had a small crew in the water to take photos and videos. We were fortunate enough to save a lane snapper but sadly we had to cut out 5 dead fish which included a massive barracuda and tarpin.

By supporting this project, you are helping us to tackle this horrible issue of illegal fishing in the Yucatan pennisula so thank you!

All the best

GVI Mexico


Dear Supporter,

We’ve had some interesting sightings out on the reef this past month,  including a sighting of a large Loggerhead turtle, who when discovered came trundling out of its hidey hole to plod away in a hilariously cumbersome manner.  Just today, a 2.5m crocodile was spotted at the bridge to the entrance of the lagoon behind the GVI camp at Pez Maya. The GVI Mexico team have also seen gray nurse sharks and hawksbill turtles along with many lionfish.

The invasion of lionfish, native to the Indo-Pacific, into the Atlantic and Caribbean Sea is not only one of the most rapid in marine history but also having extremely detrimental effects to local species and ecosystems. While in their native habitat, lionfish breed seasonally, invasive lionfish in the Atlantic have been documented breeding all-year round. Lionfish are also generalist carnivores that can consume over 70 species of fish, up to half their own body length, including commercially, recreationally, and ecologically important species6. On heavily invaded sites, lionfish consume native fish at unsustainable rates. As such, food competition can also lead to depleting food sources for native carnivores. The data collected on this project is very useful for future planning of local control efforts and will hopefully be used to co-ordinate our future lionfish control efforts which, if implemented well, can control local populations and even generate income for local communities.

Thank you for continuing to support this project.

All the best

GVI Mexico

Merry Christmas from GVI Mexico!

This month we have implemented the Synoptic Monitoring Program (SMP) in order to complete the data for one of our monitoring sites; Pedro Paila 5m. The execution of the SMP not only contributes to our base goal of continuing to gather data in a standardized format over a continuous period of time, but the data itself highlights the presence of key fish species present in the reef ecosystem. The presence of these fish species indicates the overall healthiness of the reef, and their attendance is a good sign. The most common species recorded such as the surgeonfish, are of great importance as they feed from algae, large numbers of surgeonfish on the reef help controlling the algae which are competing with the coral for space.


A healthy reef is made up of many components that work together to create a complicated and delicate balance.  When monitoring the sites at Pez Maya, we study four main groups that highlight target species that are directly affecting how healthy a reef is. These groups are: adult fish species, juvenile fish species, coral species and coral diseases, and the composition and sessile invertebrates of the benthic zone.  The data gathered about these four modules help us see a window into the reef life and health. 

These species are very important in a reef system. They have many roles, like the surgeonfish which are herbivores and planktivores.  This means they keep the thick filaments and leafy algae from overgrowing the corals. Surgeonfish are also fast growing, so they can reproduce quickly and thus are often large populations. They tend to deposit feces in the nooks and crannies where they hide which helps coral diversity and growth.  

Another species, the wrasse, feeds on the parasites found on other fish as well as purifying the wounds of injured ones. Initial phase blue head wrasses are responsible for 10% of the cleaning activities on Caribbean reefs. Through their feeding, wrasse help the fish stock stay healthy. The large number of juvenile damselfish recorded is very encouraging as it means that there are many fish to clean.

Damselfish, on the other hand, encourage algae growth through the gardens they grow in the coral. They are also popular aquarium fish due to their bright colors, and often times the fishing methods used to extract them is quite harmful to the reef.  There were also a high number of parrotfish juveniles recorded at Pedro Paila 5m.

Parrotfish have very strong teeth that they use to grasp algae from dead coral, ingesting both dead coral skeleton and the algae. Their strong stomach then grinds the reef structure, or calcium carbonate, into a fine dust, which settles as sediment. On the other hand, the Butterflyfishes have a very diverse food range. They eat anthozoids, zooanthids, tubeworms, small crustaceans and shrimp.  Such a large sampling of prey means the Butterflyfishes can survive and thrive in many different environments.

All in all, the fish on the reef at Pedro Paila 5m are a complicated network of predator, grazers, cleaner fish and omnivores. Each species affects the health of the reef in different ways, and we are happy to add this phases completed data to all of the past years information in order to show the condition of the reef. Our continuous data entry also helps fulfill the Millennium Goal of environmental sustainability because it can be used to show why the reef is healthy at certain times and what effect the outside environment is having on the reef.  This information can lead groups to make changes about the management of the reserve, the reef, and it helps to ensure humans have as little negative effect on the reefs as possible.

Thank you for continuing to support this project in 2013 and we hope to see you next year! 

GVI Mexico



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Organization Information

Global Vision International Charitable Trust

Location: Exeter, Devon - United Kingdom
Website: http:/​/​
Project Leader:
Kate Robey
St Albans, Herts United Kingdom

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