(Glossogobius giuris) is a freshwater fish native to Mainit Lake. It is called “biya” in Tagalog and “white goby or tank goby” in English. The term “pidjanga” is also sometimes fondly used to refer to the Mainitnons, the people of the Municipality of Mainit, a town in Southern Philippines. This blog hopes to capture potentials of Migrants Pidjangas for the Development of our Town by attempting to document development issues, folk stories, and current concerns, about the Pidjanga — both the fish and the people.

Lake Mainit... Philippines' Deepest Lake

Three-dimensional representation of Lake Mainit basin derived from GPS marked bathymetric and coastline data collected from September 2003 – February 2004 using Surfer V 7.0 (Golden Software Inc.).

Source: Tumanda, MI Jr., EC Roa,JG Gorospe, MT Daitia,SM Dejarme, RD Gaid (2005). Limnological and Water Quality Assessment of Lake Mainit. Mindanao State University at Naawan. (Thanks to LMDA for sharing the report).

Pidjanga notes: Indeed, at 219.35 meters maximum depth and 122.48 meters mean depth, Tumanda (2005) confirmed that Lake Mainit is the deepest lake in the Philippines. The study says that the mean depth is a reliable morphometric indicator of trophic conditions of the lake with mean depth inversely related to production. It adds that shallow lakes are more productive than deep lakes. Lake Mainit is considered a deep tropical lake hence its water volume available for biological productivity is quite small.

Sige lamang... scientific facts like this are of great importance for planning. Let's hope that brilliant Mainitnon minds (or that of Lake Mainit communities) can find some ways to make the above fact bring positive developments to our beloved lake. We'd appreciate your comments and suggestions.

Anay pa... have you noticed the deepest parts of the lake? An mga kantil jaon banda sa south- west part. An study nila Prof. Tumanda (2005) nagsuporta na kun hain an baybay na wayay mga river tributaries, jaon an mga lagyom na parte nan danaw... jaon sa area nan Malimono range. An baybay na suod s Mayag River (northwest), sa Suba nan Mainit (north), sanan Magpayang River (northeast), mga mabaw.

Next feature: Lake Mainit as the CLEAREST lake in the Philippines, beating the 1974 record of Lake Lanao in Secchi disk visibility scale.

By: Zimmbodilion Mosende.
Jul 29, 2006

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Update: In early 2012, I discovered that at 600+ meters, Mount Pinatubo Crater Lake became the deepest lake of the country.

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Maradjao karadjao, Pilipinas!

Welcome to the online home of the Pidjangas from the Municipality of Mainit, Surigao del Norte, PHILIPPINES . Pidjanga, Pedianga, Pijanga, Pedjanga... amo ra ton... gikan sa ato danao! For comments and suggestion contact me at

CBCP News: Mining threatens 4th largest freshwater lake in PH

SEVEN are in the town of Mainit, Surigao del Norte... of the 15 exploration permits (EP) that the Regional Office 13 (CARAGA) of the Mines and Geosciences Bureau (MGB) of the Environment department approved as of June 30, 2010.

Read more at and Surigao Today.

If you want to support the protection of Lake Mainit, contact me at pidjangaATgmailDOTcom or 0917-800-4557. Zimm/Peter/Pidjanga

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