This is a tour report on visiting saint martin island.

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Acknowledgements
I would like to give special thanks to almighty Allah for giving me a chance to go in such an
instructive field work with my friends and teachers. I would like to pay my profound
gratitude to the authority of the department of Fisheries and Marine science for the
permission of the fieldwork program . I would like to express my best regards to my
honorable teacher Md. Akram Ullah, (Assistant Professor), Md. Robiul Hasan (Associate
professor), Shuva Bhowmik (Assistant Professor) Department of Fisheries and marine
science, Noakhali Science and Technology University for his scholarly guidance, sincere
inspiration and generous support. I want to give special and heartiest thanks and also
acknowledge the excellent support from my honorable teacher Professor Md. Jahangir
Sarker, Ph.D., Associate professor Dr. Mohammad Belal Hossain, Department of Fisheries
and marine science, Noakhali Science and Technology University. I also want to give
heartiest thanks are extended to our seniors. Finally heartiest thanks are extended to all of
my classmates for their friendly and Co-operative behavior in the tour to complete the task
successfully.

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Table of Contents
SL
Name of Contents Page
1 Introduction 3-5
2
Experiment No-01 (Measurement of water quality parameter
 Measurement of pH
 Measurement of salanity
 Measurement of Temperature
6-8
3 Experiment No -02 Collection of Benthos: 8-10
4 Experiment No-03: Identification of sea weed: 11-16
5 Conclusion 17
6 References 17

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Introduction
Saint Martin island is generally known as "Narikel Zinzira" in Bengali and it is only coral reef
island in Bangladesh. It is a small island in the north eastern part of the Bay of Bengal created
the southern part of our country. During the British occupation the island was named as St.
Martin island, The first land use of Saint Martine started about 250 years ago with the come of
Arabian sailors. But land use of Saint Martine is unplanned today, St. Martin's Island is a small
island (area only 8 km') in the northeastern part of the Bay of Bengal, about 9 km south of the tip
of the Cox's Bazar-Teknaf peninsula.
Fig ; location of saint martin island on google Earth

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It is about 8 km west of the northwest coast of Myanmar, at the mouth of the Naf River. It is the
only coral island in Bangladesh. The distance between the island and Teknaf is about 34 km.
The north portion of the island is called "Cheradia Dwip"because during high tide, this portion of
the island is separated from the other and also considered as the Iast southern landmark of
Bangladesh.
Img: Top View Of West Point Of Saint Martin’s Island, Bangladesh
St. Martin's Island is a small island in the northeast part of the Bay of Bengal, in the
southernmost part of Bangladesh. Geographically, it is divided into three parts. The main
shoreline habitats are sandy beaches and dunes and scattered rocks and coral boulders. Some
boulders are also found on the interior into the island The shallow water marine habitats include,
rocky and sandy intertidal, intertidal rock pools, off shore lagoons, rocky and sandy sub tidal and
offshore sofi bottom habitats. It is said that in 1926, the District Collector of the British
government Mr. Martin brought this island under settlement record following which the island
was named "St. Martin's Island.

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Img : A landscape view of Chera Dwip
Img : NSTU FIMS-13 Batch with honourabe teachers in Chera Dwip

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Experiment No-01 (Measurement of water quality parameter)
A. Measurement of pH
Instruments :
1.pH meter
2.Sample water
Procedure :
 Calibrate the probe and meter following the
manufacturer specifications
 Rinse the probe with double deionized water before
using it. Dry it off with a clean tissue.
 Collect a sample of the water in a clean container.
 Adjust the meter to match the sample temperature. .Put
the probe into the sample. Wait for the meter to come
to equilibrium. The meter has reached equilibrium
when the measurement becomes steady.
 Read the pH measurement of the sample and keep this
record in Note book..pH meter should provide a
reading on the scale of 0-14.
Result:
We found the pH of sea water is 8.1
Remarks :
 Calibrate the perimeter every time before use.
 Calibrate the pH meter with buffer solution.
 Do not submerge totally the parameter machine in water.

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B.Measurement of Salainity
Instruments:
 Salanity meter
 Sample Water
Methods:
 Dip the probe into the liquid to be measured.
 Press the ON button.
 Stir the meter to get rid of bubbles, until the display
becomes stable.
 Read the figure from the display, which is salinity in
parts per hundred.
 Rinse the meter with distilled water and blot dry
after each use.
Result: We found the salinity is 33.33 ppt
Remarks :
Calibrate the perimeter every time before use.
Calibrate the salinity meter with buffer solution.
Do not submerge totally the parameter machine in water.
C.Measurement of Temperature
Instruments;
 Multi-parameter.
 Sample Water

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Procedure:
 Mark the spots and collect the water sample.
 Place the pH meter (sensor part) in the water sample until get a constant result.
 Mark down the result in note.
Result: The temperature is found 26 degree
centigrade.
Remarks:
 Calibrate the perimeter every time
before use.
 Do not submerge totally the parameter
machine in water.
Experiment No -02 Collection of Benthos:
Benthos is the community of organisms that live on, in, or near
the seabed, river, lake,or stream bottom, also known as the benthic zoneThe collection of benthos
procedure given in below:-
Instruments:
 Mud Correr
 Sieve( 500mm)
 Plastic Tray

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Method & Procedures:
1. Place the location for sample collection and mark the spots.
2. Collection of sediments from shore using mud correr about 1 m3
area.
3. Put the mud into a 500 mm sieve and carefully and nicely shake using distilled water
until the mud removed.
4. Place the organisms remaining on sieve in a plastic pot and preserve it with 10%
formalin.
5. Take the sample to the laboratory and add Rose Bengal (remain it for 1 day).
6. Dilute the sample and isolates the benthos using forceps or brush.
7. Place the benthos in a Petridis with alcohol.
8. Identify the sample under microscopes counting benthos and preserving in 70% alcohol.
Flow chart of benthos collection:
Collection of the sediments sample
Sieving of the sediment samples
Preservation of the samples with debris in 10% formalin
Transferred to the laboratory
Mixing the Rose Bengal

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Sorting of the benthos from the residues
Identification of the taxa
Counting benthos and preserving in 70% alcohol
Result:
The number of benthos is 13 in 1 qubic meter. The total number of spcies in saint martin island is
minimum: (13/0.01)* 36 =46,800
Remarks
* Do not use sea water during sieving
* Shake the sieve carefully until the mud removed
* While collecting of sediment make sure the hole on the mud correr are pressed.
* Benthos must be preserved with formalin otherwise the benthos with spoil

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Experiment No-03: Identification of sea weed
Instruments :
* Knife,Seizure ,Newspapers etc.
Procedure:
 First we have to indicate the location for sample collection and mark the spots.
 Collect seaweed sample by hand or using seizure.
 Dry it under sunlight.
 Packaging using newspaper for remains dry during transportation.
 Identification of seaweed sample using encyclopedia, research paper etc.
Sample-1 (Ulva intestinalis)
Scientific classification
Phylum: Chlorophyta
Class: Ulvophyceae
Order: Ulvales
Family: Ulvaceae
Genus: Ulva
Species: U. intestinalis
Characteristics:
 All discoid base.
 It may be 10- 30cm long and 6-10mm in diameter.
 It is a summer annual plant and euryhaline.
 It may become detached from from the substratum and rise to the water


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Sample-2 (Sargassum natans)
Scientific classification
Kingdom: Chromista
Phylum: Ochrophyta
Class: Phaeophyceae
Order: Fucales
Family: Sargassaceae
Genus: Sargassum
Species: Sargassum natans
Characteristics:
 It has highly branched thallus with hollow berry-like floats.
 Frounds are generally small and leaf-like.
 They mostly reproduces sexually.
 The largest members can be several metres in leangth.
Sample-3 (Halymenia floridana)
Scientific classification
Phylum: Rhodophyta
Class: Florideophyceae
Order: Halymeniales
Family: Halymeniaceae
Genus: Halymenia
Species: Halymenia floridana

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Characteristics:
 It is highly variable in color; ranging from bright yellow to red.
 Color variation depends on the water depth.
 It is gelatinous and smooth in texture.

Sample-4 (Caulerpa racemosa)
Scientific classification
Phylum : Chlorophyta
Class: Ulvophyceae
Order: Bryopsidales
Family: Caulerpaceae
Genus: Caulerpa
Species: C. racemosa
Characteristics:
 It is edible green algae and commonly known as sea grapes.
 It is found in the shallow water zone of the sea in the world.
 It reproduces vegetatively by fragmentation.
 They contain secondary metabolites that are cytotoxic.
Sample-5 (Padina tenuis)
Scientific classification
Kingdom :Chromist
Phylum :Ochrophyta

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Class :Phaeophyceae
Subclass: Dictyotophycide
Order: Dictyotales
Family: Dictyotaceae
Genus: Padina
Species: Padina tenuis
Characteristics:
 They are brown or whitish in color.
 They remain attached by holdfast.
 Lifecycle diplohaplontic and isomorphic.
Sample-6 (Colpomenia sinuosa)
Scientific classification
Kingdom: Chromista
Phylum: Ochrophyta
Class: Phaeophyceae
Order: Ectocarpales
Family: Scytosiphonaceae
Genus: Colpomenia
Species: C. sinuosa
Characteristics:
 It has sori with cuticle and medullary cells.
 They are found in tropical to temperate zones around the world.
 It contains phenolic compound colpol.

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Sample-7 (Liagora harveyiana)
Scientific classification
Kingdom: Plantae
Class: Florideophyceae
Order: Nemaliales
Family: Liagoraceae
Genus: Liagora
Species: Liagora harveyiana
Characteristics:
 They are charectarized by branched cylindrical thallus.
 They have chalky textured gelatinus metrics.
 They are found in tropical and subtropical sea.
Sample- 8 (Halimeda opuntia )
Scientific classification
Phylum: Chlorophyta
Subphylum: Chlorophytina
Class: Ulvophyceae
Order: Bryopsidales
Family: Halimedaceae
Genus: Halimeda
Species: Halimeda opuntia
Characteristics
 Thick ; profusely branched clumps of rounded three lobed or ribbed leaf like segments.
 10-25cm in height.
 have numerous branches.

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Sample-9 ( Asparagopsis taxiformis )
Scientific classification:
Division: Rhodophyta
Class: Florideophyceae
Order: Bonnemaisoniales
Family: Bonnemaisoniaceae
Genus: Asparagopsis
Species: A. taxiformis
Characteristics:
 Colour pinkish –brown
 Characterized by its soft thallus and pyramid shape.
 Their base is top grayish.

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Conclusion:
This tour was very informative and educative. The biodiversity of St. Martin's island is
characterised by mangrove forests, seaweeds, corals, turtles, crabs, fish, seabirds, coconut trees
and Pandanus vegetation. The island is a unique example of co-occurrence of different
ecosystems. Mangroves are home to corals, crabs, sea weeds and sea birds, and provide
excellent nurseries for marine fishes. It also protects the inhabitants from the storm surges,
cyclones and tidal waves, and prevents the island from erosion. The ecosystem and biodiversity
of Saint Martin’s island is facing serious devastating ecological critical moment due to pollution
such plastic pollution and anthropogenic pollution. Tourist is unaware of environmental issues.
The biodiversity of this island is decreasing day by day.We should keep proper implementation
for keeping Saint martin Island.
Reference:
1. https://www.researchgate.net/publication/329209828_Diversity_and_distribution_of_sea
weeds_in_Saint_Martin_Island_Bangladesh
2. https://www.researchgate.net/publication/288669683_Environmental_profile_of_St_Mart
in's_Island
3. http://en.banglapedia.org/index.php?title=St_Martin%27s_Island