^ Let's Save the Endangered Giant Clam (Tridacna gigas)

Let's Save the Endangered Giant Clam (Taklobo)*

Dr Abe V Rotor

Living with Nature School on Blog [ avrotor.blogspot.com ]*

Retired Professor, UST Graduate School

Author and his students lift a living specimen of the Giant Clam 

(Tridacna gigas) from its natural habitat during an on-site study

off the coast of Masinloc, Zambales.

 

A seven-kilogram Tridacna gigas is examined by students in 

Environmental Science from the UST Graduate School

Natural habitat of taklobo at 6 to 14 feet on coral reef 

of San Salvador Island, east of Masinloc, Zambales.

Facts about the giant clam, Tridacna gigas.

1. In the Philippines it is called taklobo. It is the largest living bivalve mollusk and one of the most endangered clams.

2. It lives on shallow coral reefs of the South Pacific and Indian oceans, up to 20 meters deep.

3. It weighs more than 200 kilograms (440 pounds), and measures as much as 1.2 m (4 feet) across. It has an average lifespan in the wild of 100 years or more.

4. Although larval clams are planktonic, they become sessile in adulthood. Growth is enhanced by the clam's ability to grow algae in symbiosis. The creature's mantle tissues act as a habitat for the symbiotic single-celled dinoflagellate algae (zooxanthellae) from which it gets its nutrition. By day, the clam opens its shell and extends its mantle tissue so that the algae receive the sunlight they need to photosynthesize.

5. T. gigas reproduce sexually. They are hermaphrodites (producing both eggs and sperm), but self fertilization is not possible. Since giant clams can't move across the sea floor, the solution is broadcast spawning. This entails the release of sperm and eggs into the water where fertilization takes place.

Let's save the giant clams. It's better to be assured they are alive on the seafloor than to have their fossils in our home.~

 

Tridacna in its natural habitat - lighted seafloor.  Right, Tridacna graveyard. 

Shell is highly prized locally and for export.  Collection and selling 

of Tridacna shell is strictly prohibited. 

 

Mrs Cecilia Rojas Rotor, author's wife. poses before a giant Tridacna shell as holy water receptacle in Mount Carmel Church, QC

------------------

*Why are giant clams endangered in the Philippines? Giant clams, which can weigh up to 200kg and live for more than a century, face an existential threat from illegal poaching – and very likely organized crime – which has spiked in the last few years across Philippine and Indonesian waters, conservationists have warned. Internet Apr 26, 2023

References: Living with Nature by AVRotor; Marine Biology: An Ecological Approach by JW Nybakken; Wikipedia.

 Lesson on former Paaralang Bayan sa Himpapawid with Ms Melly C Tenorio 738 DZRB AM Band, 8 to 9 evening class, Monday to Friday

--------------------------------------

Annex: AI Overview
“Let’s Save the Endangered Giant Clam (Taklobo)” 

by Dr. Abercio V. Rotor

Dr. Abercio V. Rotor’s “Let’s Save the Endangered Giant Clam (Taklobo)” is a conservation-focused piece that blends marine biology education with a call to action against the illegal exploitation of Tridacna gigas, the giant clam, known locally in the Philippines as taklobo naturalismavrotor.blogspot.com+1.

Background and purpose
The article, published on Rotor’s Naturalism – the Eighth Sense blog, a former UST Graduate School professor and environmental educator. It was inspired by on-site field studies off Masinloc, Zambales, where Rotor and his students examined a live specimen of T. gigas in its natural habitat naturalismavrotor.blogspot.com+1. The piece aims to raise awareness about the species’ ecological importance, its vulnerability, and the urgent need to protect it from poaching and organized crime.

Key facts about the giant clam naturalismavrotor.blogspot.com+1
Scientific name: Tridacna gigas

• Local name: Taklobo (Philippines)
• Status: Largest living bivalve mollusk; one of the most endangered clams in the world.
• Habitat: Shallow coral reefs in the South Pacific and Indian Oceans, up to 20 m deep.
• Size/weight: Up to 1.2 m across; can exceed 200 kg.
• Lifespan: 100+ years in the wild.
• Ecology: Larval stage is planktonic; adults are sessile and rely on symbiotic zooxanthellae algae for nutrition.
• Reproduction: Hermaphroditic, but cannot self-fertilize; reproduces via broadcast spawning.

Conservation concerns
Rotor highlights that in the Philippines, giant clams face existential threats from illegal poaching, often linked to organized crime, with recent spikes in Philippine and Indonesian waters naturalismavrotor.blogspot.com+1. The shell is highly valued for local and export markets, but collection and sale are strictly prohibited under Philippine law. The author emphasizes that it is better to ensure these clams remain alive on the seafloor than to have them as fossils in museums.

Message and call to action
The title and closing statement — “It’s better to be assured they are alive on the seafloor than to have their fossils in our home” — encapsulate the author’s advocacy: protect living ecosystems rather than exploit them for profit. The piece also serves as an educational tool, likely used in environmental science classes, to instill stewardship and legal compliance in marine conservation naturalismavrotor.blogspot.com+1.
In short, the context is a scientifically informed, emotionally charged appeal to safeguard the taklobo from overexploitation, combining ecological facts with a moral and legal argument for marine biodiversity protection. AI Overview