This document provides information about seven species of sea turtles: Olive Ridley, Green, Loggerhead, Leatherback, Hawksbill, Kemp's Ridley, and Flatback. It discusses their key features such as being air-breathing reptiles that are highly migratory and long-living. The document also outlines their worldwide distribution, omnivorous or herbivorous diets, continental shelf habitats, and nesting behaviors. Major threats to sea turtles are listed as poaching, bycatch, plastic pollution, oil spills, and artificial lighting near beaches. All species are classified by IUCN as endangered, critically endangered, or vulnerable.

1. A PRESENTATION ON
SEA TURTLE
PRESENTED BY-
Md. Nazmul Islam
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2. Name: Scientific name:
1.Olive Ridely Turtle Lepidochelys olivacea
2.Green Turtle Chelonia mydas
3.Loggerhead Caretta caretta
4.Leatherback Dermochelys coriacea
5.Hawksbill Enetmochelys imbricata
6.Kem’s ridley Lepidochelys kempii
7.Flat back Natator depressa
There are 7 species of marine turtle that is given below:
Turtle: Turtles are reptiles that live in tropical and sub tropical waters throughout the
world.
Fig: Scientific name of seven living species of sea
turtles 2

3. Key features:
Air Breathing Reptiles.
Highly Migratory
(about 42,000 km)
Bio Indicator.
Long living Creatures.
Maturation between 15 to 50 years.
https://www.facebook.com/BdFisheriesCommunity/photos/g
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4. Distribution: World wide distributed except polar region.
Diet:
Omnivorous in adult life.
Green turtle is herbivorous.
Jelly fish,Crabs,sponge,seagrass,young fish, sea cucumber used as
food.
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5. Habitat: Generally found in continental shelf.
For the first time when they come contact with water,
males won’t return to shore again.
Female will come ashore to lay eggs on sandy beach
during nesting season.
Reproduction:
Late monsoon /early winter.
They placed their eggs under sand about 50-60 days for fertilization.
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6. https://www.education.com/worksheet/article/color-life-cycle-19/
Fig: Life Cycle
of Sea Turtle
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7. Importance:
They eat sea grass on the sea floor
and maintain the health of sea grass beds and it has positive impacts
on ecosystem.
Dune vegetation grows stronger
and healthier where turtles use as nest.
There are some umbrella species which protect a
number of other species that depend on the same
habitat.
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8. Poaching.
By catch and destructive fishing practices.
Plastic materials.
Oil spills and marine pollutions.
Artificial lighting, beach disturbance causes
problems of nesting.
Threats:
https://www.google.com/search?q=sea+turtle+threats&rlz=1C1CHZL_
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https://www.google.com/search?rlz=1C1CHZL_enBD809BD809&biw=1350&bih=
640&tbm=isch&sa=1&ei=vP25W7DEG4iBvQTgypHABQ&q=sea+turtle+threats+b
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9. All are listed on the IUCN Red list of Endangered Species.
We have to ensure secure environments in which both turtles
and the people depends upon them can survive into the future.
4. Data deficient: The flatback.
3.Vulnerable: The Olive ridley.
2.Endangered: The Logger head and Green turtles .
1.Critically endangered: The Kemp's Ridley,hawksbill
and Leatherback Turtles.
Conservation Status:
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10. https://www.facebook.com/groups/Banglad
eshFisheriesCommunity/?fref=nf&__tn__=k
C-R
https://en.wikipedia.org/wiki/Turtle
www.wiseoceans.com
https://conserveturtles.org/information-
about-sea-turtles-their-habitats-and-threats-
to-their-survival/
https://defenders.org/sea-turtles/basic-facts
References:
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