Marine Biology Weeks

Eco-adventure for everyone! Divers, snorkelers and non-divers can learn about and help conserve precious coral reefs in an active workshop in Yap.

October 27th – November 9th, 2019

  • What is Plankton? Where is it during the day?
  • Which groups of organisms live in the sea?
  • What is symbiosis and why is it important?
  • How does a seastar walk?
  • What is a coral reef’s food web?
  • What are the today´s pressures on marine ecosystems?

Conserving our Ocean

The health of coral reefs is a sensitive barometer for the health of the ocean and planet. We are starting a long-term reef monitoring program that can help preserve our reefs. This eco-adventure vacation package is for everybody ages 6 and up, and also for knowledgeable nature lovers.

Divers, snorkelers and non-divers work in teams throughout the day taking samples of microfauna living on reef rock, in the sand or plankton – followed by microscope sessions. We begin with a 3-day “basic” Marine Biology Workshop, go ahead with a 2-day “advanced” workshop and end with a 2-day coral ID workshop. The focus of the basic workshop is coral reef ecology, mechanisms of reef building and erosion, structure and zonation, functional groups, food web, threats to coral reefs and preservation. During the “advanced” workshop we will take a closer look at species ID, species lists and some marine biological methods. Within the Coral ID workshop we will deal extensively with corals and you will be able to identify any hard coral down to genus level..

Everyone contributes to the common results and there are lectures in the evening on various topics of coral reefs. A marine biology quiz is on the schedule and participants also receive an interesting course file and certificate at the end of the course.

One-Week Packages Starting at $1,879USD

Download the Flyer
Marine Biology Weeks flyer 2019

Two-week Packages starting at $3,149USD


  • 14 nights / 22 dives
  • Half day kayak trip
  • Private Beach BBQ
  • Land-/Cultural Tour
  • Village visit including local lunch
  • Local dinner
  • Late check-out
  • Daily breakfast
  • Round trip airport/hotel transfer
  • Coffee/tea wake-up service
  • Wi-Fi and all hotel taxes

Combination 10% discount when booking BOTH Marine Biology Weeks and Yap Divers 4 Sharks (1 week minimum) packages.

Our Environment

Coral reefs are so vast they can be seen from space, these complex and highly sensitive ecosystems are home to over 25% of all marine fish species. But there´s also a great microcosm to be explored: You will learn about the basis of the reef food chain which is essential for all bigger fish and animals that we enjoy as divers. Coral polyps are singular organisms, only a few millimeters in diameter, that create vast reef systems. We will learn about, study and experience our connection to the ocean from a biological perspective in an active all-ages vacation package.

Customize Your Package

We offer 3 different workshops during Marine Biology Weeks. Create your adventure with one, two or three workshops in one or two-week long packages:

  • Basic Workshop
  • Advanced Workshop
  • Coral ID Workshop

More Information

Stephan Moldzio


As a biologist, diving instructor, UW photographer, Stephan Moldzio wants to inspire people under the spell of the underwater world. Since 2009 he has conducted marine biology workshops, reef check courses and a reef monitoring program.

Aquarist for more than 34 years, the free-lance marine biologist deals with coral propagation and offers various services around marine aquarium keeping.

Other subjects of interest are the climate system, the global material cycles and environmental protection.

Today and in the future marine ecosystems are exposed to a wide range of pressures. His concern is to inspire for the fascination of the seas and encourage to take action for their protection.

More information on Stephan’s homepage

Availability & Reservations

Jendrik Schroeder
Jendrik Schroeder
15:18 15 Jun 19
It´s an excellent diving and a wonderfull cultural experience to visit Yap. The Manta Ray Bay resort provides you with friendly and skilled staff both in diving and in the hotel department. The underwater world is extremely beautifull and the island culture very interesting to explore! I enjoyed both the diving and the cultural experience to the maximum !!!!!read more
Chris Mars
Chris Mars
18:28 26 Mar 19
This is my home island.. Iam just giving it 5 star review cuz i miss home.. Feels like forever since I Last visitedread more
stacey blake
stacey blake
16:26 20 Mar 19
Beautiful resort and location, small and quaint with very attentive service from wonderful staff who were extremely friendly and helpful, and knew everyone's name (travelled with a group of 20 people) within the first day. Yap Divers staff were amazing, we were even offered hot tea during our surface intervals with some delicious snacks, and they ensured we had the best possible dive experience on each dive. I would return to this gorgeous island and absolutely stay at Manta Bay Resort again, it's well worth the trip!read more
Shaun Suliol
Shaun Suliol
11:48 12 Mar 19
The staff made sure our every needs were met! They were accommodating to my groups weird requests. We felt spoiled. They even remember our names. No where else but in Yap at the Manta Ray!read more
Doreen Korbl
Doreen Korbl
19:09 10 Mar 19
incredible service, special thanks to Ruud the resort manager
Michael Fusco
Michael Fusco
04:49 22 Jan 19
MantaRayBay Resort, is THE dive resort. It is so obvious that this place was designed for divers, BY divers. The concept that all of the guests are part of the resort family seems to be the cornerstone of MRB Resort. The dive service is top notch; the wait staff spot-on, the resort staff super friendly and attentive. The dive sites are great, especially the southern walls, and of course the cleaning stations visited so often by the Manta Rays. I have gone scuba diving all over western Asia and the Caribbean, and MRB Resort is at the top!read more
Deb Roy-Stothart
Deb Roy-Stothart
13:55 06 Dec 18
The highest level of dive service ever experienced! Fabulous dive operation from crew, boats, snacks, hot tea and water, warm towels etc. etc. and of course the Manta Rays!! Thank you for making my 100th dive so memorable. Accommodations 5 star! Food was fabulous! Can't say enough about this beautiful Island and it's people. Loved Yap! Deb & Glenn, London, Ontarioread more
Jan Toman
Jan Toman
22:14 02 Nov 18
Great! GREAT! GREAT! Lovely place, lovely staff, great location for divers!
Ms. Malinda
Ms. Malinda
13:52 14 Oct 18
Great place to stay while visiting the island. Lots of activities to do with places to see & people to more
Rene Sten
Rene Sten
04:06 12 Oct 18
Bill and his family run a great dive resort, rooms are spacious and comfortable. Restaurant and bar provide good range of food and drink. Bill and his dive guides know the reef intimately and the diving is spectacular. Bill and his family make for a very friendly and rewarding experience in more
Jonathan Gapith
Jonathan Gapith
10:31 19 Sep 18
Best dive resort around, amazingly friendly staff and great food on the mnuw
Daniel Granzer
Daniel Granzer
11:40 23 Aug 18
We were from 11.08 to 18.08 at the Manta Ray Bay resort and had unforgettable days there 😍In total we made 12 dives with wonderful encounters. Highlights were, of course, the manta rays in the Goofnuw Channel and many white tip reef sharks in the Shark City 🦈 But also we saw eagle rays, turtles 🐢 and buffalo head parrotfish. The hotel is beautiful and the whole team does a great job there. The food on the ship Mnuw, as well as the home-brewed beer are excellent. Thank you again to the whole team of Manta Ray Bay Resort and Yap Divers 👏🏼We also did a one-day land tour to explore the many beautiful places of this unique island. The beach is like in paradise🏝, stone money and relics from the second world war very worth to see! You find there also culturally typical houses with different meaning and use! It would be nice if more visitors would come to this great island and appreciate the great work that is done there! Anyway, we really enjoyed it and would come back anytime 🙏🏻✌🏼read more
Emily Caquelin
Emily Caquelin
04:10 02 Aug 18
Manta Ray Bay Resort is a great dive resort with extremely hospitable staff.
William Myers
William Myers
21:01 21 Jul 18
Great hotel. Have stayed twice.
Jim Reilly
Jim Reilly
11:27 21 Mar 18
We stayed at the hotel and dove with Manta Ray divers in early December 2017. The hotel is very comfortable, well run and staffed with wonderful employees. During our visit my wife came down with an illness and the consideration and support from the hotel and dive staff could not have been more
Sandy Stinson
Sandy Stinson
16:03 03 Mar 18
The staff couldn't be more friendly and accommodating. Food is good, (worth upgrading to include all meals). Diving is good more
Alex Divinsky
Alex Divinsky
17:24 01 Jan 18
The best place to stay in Yap. The resort is really nice and clean, the scuba diving is great, and the docked ship that houses the bar, restaurant, and movie screen is very cool. I really enjoyed my stay more
10:44 01 Jan 18
Offers one of the best accommodation service. It also has a uniquely designed restaurant.
Yi-Hsin Lin
Yi-Hsin Lin
00:53 21 Feb 17
The whole place centers around the scuba diving operation. Probably better to find somewhere else if you're not a diver. The dive operation was generally good, but a little too laid back - schedules weren't always clear, and sometimes would change without any notice. Sometimes it was hard to tell if this was really because of changing tides/weather or because of the island pace of life. Pizza is a surprisingly good option at the more
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