Distribution of razor clam

Presentation by : Syaza Hani binti Jamaludin (P76797)

For STAL 6013

Lecturer : Prof Othman Ross

Marine Science ProgramSchool of the Environment and Natural ResourcesUniversiti Kebangsaan Malaysia (UKM)

DISTRIBUTION OF RAZOR CLAM

INTRODUCTION ECOLOGY CONCLUSION

• RAZOR CLAM• MORPHOLOGY• LIFE HISTORY• REPRODUCTION

• ECOLOGICAL ROLE• DISTRIBUTION

• CONCERN

Named because their long, convex shape resembles an old-fashioned barber's straight-edged razor.

American razor clam: Ensisamericanus, Ensis directus

Indian ocean: Solen dactylus

Danish waters: Phaxaspellucidus, Ensis arcuatus

Sarawak: Solen regularis, Solen lamarckii, SolenSarawakensis


What is Razor Clam?

Short siphon : burrow below the surface to eat

Shells covered with yellowish periostracum : to protect mantle

Foot : dig, jump & swim

Umbos nearer to anterior than posterior


1. Spawning & larvae

2. Juveniles & adults

3. Age & growth


Dioecious mollusc

Two sexes distinguished spawning season

Male gonad : milky-white with smooth surface

Female gonad : beige in colour with a rough surface

Fertilization occurs externally in the surrounding seawater

Breeding: eggs & sperm discharged onto wet sand & into seaweter

Fertilization occurs by chance


Razor clam filters its food from the surrounding water

Disturbed : it can pull down up to 30 cm deep vertically by using sharp twitch of the foot

Suspension feeder


1. Sandy beaches 2. Intertidal flats3. Subtidal zone

Sarawak : intertidal sandy beaches & mudflats of Kuching, SamarahanSabah : Labuan Territory Federation & sandy beaches Teluk Mengakong, PulauBanggiPeninsular Malaysia : Kuala Langat , Tanjung Lumpur

Razor clam tolerates with :

1. Temperature

2. salinity



Silt-generating

• Dredging

• During & after time of setting

Low-surface oxygen

• Razor clam require high levels of dissolved oxygen

Rough surface

• Routine data hard to gathered by reasearcher

Paralytic shellfish poisoning (PSP)

• Parasitic nematode

• Ribbon worm

Parasitic nematode Marine ribbon worm

Starry flounder

Seagulls

Ducks

Sandpiper

Glaucous-winged gull

Green & white sturgeon

Bears

Predators

