Coral Reef Monitoring Survey and Checklist of Fishes, Aircraft Wreck Sites, Chuuk Lagoon, Federated States of Micronesia, 1997.
Marine Survey Coral Reef Monitoring
Checklist of Fishes (Kenneth Yong, SJ)

Below are excerpts from the full reports (for a fuller discussion, maps, and the complete annotated checklist of the fishes, please contact Kenneth Yong, SJ, at :xhs@mail.fm)

Coral Reef Monitoring Project 1997 -- Nakajima B6N wreck site (Edsel Elias, Pohnpei; Clarence Kitalong, Palau; Herman Tewasilmal, Yap)

...The methods used in the coral reef survey include the UNEP (United Nations Environmental Program) Coral Reef Monitoring survey plots (based on the UNEP Coral Reef Monitoring Handbook) and distance and timed sight identification. For the first three days of the survey, we concentrated on the sight identification of fish and invertebrates. This was conducted with the main intention of improving our skills in identifying different fish species and invertebrates...Observations of unknown fauna were recorded on the XHS Fish and Invertebrate Identification Worksheet. Identifications were later made using the following references: Allen and Steene, 1994; Myers, 1989; Leiske and Myers, 1994; and Colin and Arneson, 1995. The following hours were spent underwater while completing the reef monitoring and distance & sight identification.



Observer Total hours/minutes
Herman Tewasilmal 10 hours 20 minutes
Clarence Kitalong 10 hours 20 minutes
Edsel Elias 10 hours 20 minutes

The reef we monitored was relatively healthy and able to support a multitude of marine life forms. It was, however, under a little stress from fishing pressure and minor amounts of pollution. There are toilets with sewage flowing directly into the ocean and soda cans, among other visible pollutants, lying in the sand. Preservation and conservation are the important ideas to keep in mind...The collecting of corals and sand for building materials, as commonly practiced by the local community, damages the reef, in addition to creating sediment which suffocate marine life. If an area must be exploited, it should be done with conservation in mind. Dynamite fishing was observed once during a dive in the month of November. It was the first time for Clarence L. Kitalong Jr. to witness such an event and it was not very enjoyable...Taking only what is needed and doing as little damage as possible is what is encouraged...Sewage management and fishing methods are a few of the topics that should be looked into since they have an enormous impact on the coral reef system.

...The key to solving such problems usually begins first with education, local or foreign. Teaching people, especially the younger generation, to be more aware of their environment through outdoor activities such as snorkeling and hiking should be included in the local schools. Locals who are already aware of conservation and preservation methods (such as college graduates, or Xavier High School students) should return to their home islands and help their neighbors become environmentally conscious. People should know how to care for their environment; we all have to be aware of what's going on in our world. Micronesia is seen to be a tropical paradise in the Pacific. It is up to us to see that it remains that way.

Note:This year, 1998, reef monitoring surveys are being conducted off the Xavier Dock, the Truk Continental Hotel, and off Udot Island (at the site of two traditional stone fish traps). Work is still in progress.


Checklist of Fishes (Kenneth Yong, SJ)

The Nakajima B6N wreck site was the primary area of study. Most of the bottom time at this site was spent identifying the various species of fishes occurring at the wreck and a small adjacent reef slope. As a comparison, the previous two wrecks studied by Maritime Archaeology students of Xavier High School, Chuuk, was also surveyed for their fish fauna. The lower numbers of species obtained at these two sites can be partly attributed to the lower number of hours spent on the surveys. Still, a good general picture was obtained of the distribution of fish fauna on all three sites, which all occur close to shore and are adjacent to coral reefs. The Mitsubishi A6M5 and the Nakajima B6N both rest at approximately the same depth (26-30 feet) underwater. Between October 9, 1996 and May 3, 1997, the author made the following number of dives and spent the following number of hours at the three sites (a majority of these dives were made in April, 1997):

Site Nakajima B6N Nakajima C6N Mitsubishi A6M5
Number of Dives - Hours & Minutes 37 - 40:13 6 - 4:56 3 - 3:12

For all three surveys, the author restricted himself to studying an area marked out by a circle with a radius of 100 feet centered around the wreck. Surveys were time-based, i.e. species seen within bottom times, generally 45-75 minutes, were recorded as present for the site. If the species proved to be of special interest, as is pointed below in the detailed genus discussion, number of sightings was also recorded. the At least 163 (including two species seen after the close of the study period -- see below) species were identified at the B6N site, a number which compares favorably with other species counts made elsewhere in Chuuk lagoon (145 species, Weno - Amesbury et. al., 1978; 65 species, Dublon -- Amesbury et. al., 1977; 136, Tol - Clayshulte, et. al., 1978). As mentioned earlier, the other two sites surveyed, especially the wreck of the A6M5, will probably yield more species with increased observer time. Primary identification reference material was Myers, 1991 and Lieske and Myers, 1994. The author also drew on his experience working with the fish collections of the Zoological Reference Collection, Singapore (formerly the Natural History Collection, National Museum); the Natural History Museum, England; the Zoological Museum, Bogor, Indonesia; and the Philippine National Museum.

Breakdown by Genera and Number of Species

Wreck

Genera
Nakajima B6N

Number of Species
Nakajima C6N

Number of Species
Mitsubishi A6M5

Number of Species
MURAENIDAE 1 1 0
CLUPEIDAE 2 0 0
SYNODONTIDAE 2 2 2
HOLOCENTRIDAE 9 4 1
CENTRISCIDAE 1 1 1
SYNGNATHIDAE 3 2 2
SCORPAENIDAE 0 1 0
SERRANIDAE 6 5 3
APOGONIDAE 6 4 4
MALACANTHIDAE 1 0 0
CARANGIDAE 2 2 1
LUTJANIDAE 1 3 1
CAESIONIDAE 2 3 0
HAEMULIDAE 1 0 0
NEMIPTERIDAE 2 1 1
LETHRINIDAE 6 5 4
MULLIDAE 5 3 2
EPHIPPIDAE 1 1 1
KYPHOSIDAE 0 1 0
CHAETODONTIDAE 16 10 9
POMACANTHIDAE 3 2 1
POMACENTRIDAE 23 20 15
LABRIIDAE 16 14 14
SCARIDAE 9 8 6
BLENNIDAE 5 4 4
MICRODESMIDAE 2 0 0
GOBIIDAE 12 4 4
ACANTHURIDAE 8 6 7
ZANCLIDAE 1 1 1
SIGANIDAE 6 5 3
SCOMBRIDAE 1 0 0
BALISTIDAE 3 5 2
MONOCANTHIDAE 2 1 1
TETRAODONTIDAE 3 2 2
TOTAL NUMBER OF SPECIES 161 (32 genera) 121 (29 genera) 92 (25 genera)

Note: After the close of the project, two more species were identified on the Nakajima B6N wreck: a barracuda, tentatively Sphyraena obtusata, and a lutjanid, Aphareus furca.

Senior Projects