Impacts of Rainfall and Related Hydrological Factors on Spawning Characteristics of Silver Barb (Barbonymus gonionotus Bleeker, 1849) in a Tropical Reservoir Ecosystem
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Abstract
Climate change has a major influence on aquatic biodiversity and hydrological conditions, and it will continue to adversely affect the structure and function of aquatic ecosystems. Ubolratana Reservoir is a shallow mesotrophic reservoir in Northeast Thailand and serves multiple purposes, including fisheries activity. This study investigates the possible impacts of rainfall, water inflow, and water storage of the reservoir on spawning characteristics of silver barb (Barbonymus gonionotus Bleeker, 1849). Results show that meteoro-hydrological factors affected fish larvae in the riverine zones of the Phong and Choen river inlets during the early rainy season (June of 2018 and 2019). High densities of larvae (1,096 and 12 individuals·1,000 m-3) were found in Phong and Choen rivers, respectively. Principal Component Analysis (PCA) indicated that the density of newly hatched larvae (age<3 days) in the Phong River channel was correlated with rainfall (λ = 0.19) and its relative increase (λ = 0.51), while density of older larvae (age>3 days) was correlated with volume of inflow (λ = 0.81) and its relative increase (λ = 0.76). Therefore, rainfall and inflow are identified as important factors influencing the larval densities of silver barb in the reservoir’s riverine ecosystem. These findings imply that rainfall and inflows into the reservoir ecosystem should be considered along with other factors for further conservation management of fishery resources.
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