A PHILIPPINE FIRST: In-situ spawning of Palawan native or Philippines true giant clam successfully spawned with 9.5 million eggs fertilized in Puerto Princesa, Palawan on June 1, 2019. (Photos courtesy of Malampaya Foundation Inc.)

Environment

Malampaya Foundation spawns native, biggest giant clam

By Summer Buyante

June 10, 2019

The first ever in-situ spawning of the Palawan native species of the biggest giant clam, Tridacna gigas, was organized and facilitated by Malampaya Foundation (MFI) and partners to help increase its declining population, Saturday, at WPU Hatchery in Binduyan, Puerto Princesa City.

University of the Philippines Marine Science Institute (UPMSI), forerunner of giant clam conservation in the Philippines, supervised the spawning activity where about 9.5 million eggs were fertilized from native giant clams located at Dos Palmas.

Dr. Lota A. Creencia of Western Philippine University (WPU) College of Fisheries and Aquatic Sciences said, “ Tridicana gigas is hard to propagate because the population is few. We need to really go to the brood stock [source] to collect eggs and sperms, compared to other species of clams which numbers can still afford to be brought into laboratories.”

Once sufficiently matured, the native Tridacna gigas will be deployed to MFI’s marine protected areas in northern Palawan.

THE SPAWNING: After injecting serotonin to the Tridacna gigas, the diver has to wait until it to induce, first, sperm cells, followed by egg cells. For the collected sperms and eggs to fertilize, a certain proportion has to be followed. Photo taken during the first spawning activity of Palawan genome Tridacna gigas last June 1 at Dos Palmas. (Photo courtesy of Malampaya Foundation Inc.)

Sherry Lyn Sayco, researcher at UPMSI, said, “Important yung giant clams dahil marami silang ecological significance, habitat and food for some of the marine animals. It also benefits people because it helps increase fish density.”

Meanwhile, the Tridacana gigas is one of the most endangered clam species and was even declared extinct in the Philippines in the 1980s. In order to bring it back, UPMSI, under the leadership of national scientist Dr. Ed Gomez, took specimen coming from the Pacific Islands and grew it in the country.

Surprisingly, it was found out that the Philippine-native species of the Tridicana gigas still exists in Palawan. Dr. Gomez himself confirmed this during his visit at the spawning site in Dos Palmas.

Dr. Lota A. Creencia of Western Philippine University said that there are reports that prove the giant clams found in Palawan are native.

“Kasi ang sizes na nandito sa Honda Bay ay really bigger [compared to the ones spawned from Pacific Islands], pero para ma confirm lang ay magcoconduct ng molecular study,” Dr. Creencia said.

AT WPU HATCHERY’S LAB: MFI Biodiversity Conservation Manager Pacifico Beldia II observes the early phase of the Tridacna gigas fertilized eggs’ development last June 1 at the laboratory of WPU Hatchery in Binduyan, Puerto Princesa City. On the average, a juvenile has to spend six months in the hatchery before it is placed in ocean nurseries. When it is finally released into the wild, it has to be caged during the initial months for further protection it until it matures enough to survive on its own. (Photo courtesy of Malampaya Foundation Inc.)

The spawning activity was in line with MFI’s “String-of-Pearls of Project” that has begun last year, successfully multiplying two other species of giant clam namely Tridacna squamosa and Hippopus hippopus,

MFI has been partnering with communities, local governments and agencies in Palawan, Oriental Mindoro and Batangas to establish, expand and set-up proper management and protection mechanisms for MPAs since 2013.

MFI’s String of Pearls Project is also in partnership with Palawan States University, Western Philippine University, Palawan Council for Sustainable Development, and Dos Palmas Resort & Spa. (PR / PCSD)