Effect of climate on endemic species in Laguna Lake

Date

2023

Abstract

Laguna de Bay and Taal Lake are two of the largest fresh water bodies that supply fish to Metro Manila and Southern Luzon [Philippines]. Traditionally, fish cultures from Laguna de Bay consisted of the Leiopotherapon plumbeus (silver perch) or locally known as ayungin, the Glossogobius giurus (white goby; local name 'biyang puti') and Ariidae sp., collectively called kanduli. From Taal Lake, the most common catches includes tawilis (Sardinella tawilis) and maliputo (Caranx ignobilis). The advent of climate change concerns and the uncertainties that the new climate normals bring necessitate as closer look at how the Philippine's fresh aquatic resources may likewise change. The project assessed the effects of climate change on fingerling stage of endemic species maliputo (Caranx ignobilis) and the fry stage of (ayungin (Leipotherapon blumbeus). Fingerlings of C. ignobilis and L. plumbeus were randomly distributed into experiment tanks. Treatments included aerated un-heated tanks and heated tanks (27 deg C and 33 deg C). Physico chemical parameters were measured daily at six hour intervals. These included temperature, pH, dissolved oxygen, and total dissolved solids. Biological parameters measured included fish weight and size. From the C. ignobilis and L. plumbeus experiments, it was shown that there was no significant difference in mortality from fingerling of fry raised at ambient temperature (unheated) from those that were raised at elevated temperature (heated). Therefore Caranx ignobilis fingerling and L. plumbeus fry propagation are not yet threatened by global warming for the next thirty years. However, breeding programs take many many years (possibly more than 30 years). In order to be ready for climate adaptation and resilience, breeding for climate change must be initiated now. Furthermore, more research should be conducted for the juvenile and adult stages, particularly during fertilization wherein climate change has been implicated in affecting fish stocks.

Document Type

Article

Pages /Collation

6 leaves

En – AGROVOC descriptors

FISH; SPECIES; ARIIDAE; CARANX IGNOBILIS; INDIGENOUS ORGANISMS; FINGERLINGS; CLIMATIC CHANGE; LAKES; PHILIPPINES

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