In this issue

Antibacterial Potential of Gracilaria edulis Extracts Against Pathogenic Bacteria: Input to Organic Aquaculture
Identification of Plankton in the Stomach of Milkfish (Chanos chanos) Seeds Obtained from Natural Waters
First Record of Hermaphroditism in Green Mussels (Perna viridis) in the Philippines
The Post-Harvest Handling Practices of Glass Eel in Aparri, Cagayan: Operations, Challenges and Recommendations
Dietary Vitamin C and Lipid Feed Supplementations Influence the Expression of Immune-Related Genes in Litopenaeus vannamei (Boone 1931) Subjected to Thermal Stress
Gender Participation in the Capture and Marketing Sectors of the Glass Eel Fisheries in Aparri, Cagayan, Philippines
Status of Nematopalaemon tenuipes, Spider Prawn (Family: Palaemonidae) Stocks Caught in Aparri, Cagayan: A case of Gentleman’s Agreement Management Strategy
Environmental Change and Trends in Brackishwater Pond Milkfish Chanos chanos Production in the Philippines Over Six Decades: Insights to Possible Resiliency
Coral Reef Habitat and Associated Reef Fishes in the Kalayaan Island Group, West Philippine Sea
Catches and the Production of the Sea Cucumber Fishery of Mindanao, Philippines
Ichthyofauna of the Rasian and Asahan Rivers in the South Coast of Aceh Province, Indonesia
Determinants of Food Insecurity among Municipal Fishing Households during the COVID-19 Pandemic under Alert Level 1 in Kawit, Cavite, Philippines
Cell Viability and Coelomocyte Characterization of Crown-of-Thorns Starfish (Acanthaster planci L.) Collected from Southern Leyte, Philippines
Farming Systems of Eucheumatoid Seaweeds in Western Visayas, Philippines
Climate and Non-climate Related Hazards in Small Pelagic Fisheries and Milkfish Aquaculture: Expert Opinion Survey in the Philippines
Identification and Allometric Scaling of Megamouth Shark (Megachasma pelagios) Mother-Offspring Specimens from Dipaculao, Aurora, Luzon Island, Philippines
The Catch and Trade of Seahorses in the Philippines Post-CITES (2019)

Journal Issue Volume 32 Issue 1 Environmental Change and Trends in Brackishwater Pond Milkfish...

Research Article

Environmental Change and Trends in Brackishwater Pond Milkfish Chanos chanos Production in the Philippines Over Six Decades: Insights to Possible Resiliency

, Raymundo P Addun2, John Warner M Carag2,3

1 Institute of Environmental Science and Meteorology, College of Science, University of the Philippines Diliman, Quezon City
2 Science and Society Program, College of Science, University of the Philippines Diliman, Quezon City
3 National Institute of Geological Sciences, College of Science, University of the Philippines Diliman, Quezon City

Page 81-94 | Received : January 24, 2020, Accepted : February 12, 2025

Abstract

The sixty-six (66)-year brackishwater pond production trends from 1952 to 2018 in the Philippines reflect low metric tonnage and low productivity per hectare despite increasing mangrove conversion to fishponds and increasing aquaculture intensification nationwide. These trends were related to yearly climatological means by graphical analysis and regression. Our analysis suggests that the likely cause of the sharp decline in production and productivity starting in 1993 is the 1991 Mt. Pinatubo eruption and other environmental stress factors, including a warming climate. Environmental stress factors have contributed to about 85,500 MT of production loss every year since 1993 and a slight yearly productivity decline between 0.04 kg ha-1 and 0.1 kg ha-1 since the early 1970s. Increases in mangrove conversion to fishponds did not increase production nor productivity. Despite aquaculture intensification and shifts in production modalities, the mean production of milkfish in 2018 is similar to records taken in the late 1980s. This implies unsustainability as a result of environmental changes and has serious implications for food security.


Keywords: aquaculture, brackishwater fishponds, climate change, milkfish, food security