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Abstract
The objective of the present study was to evaluate the effects of temperature and copper on growth, feeding rate and respiration in the larvae of Waigieu seaperch Psammoperca waigiensis. Fish larvae were exposed to one of copper concentrations of 0, 50, 100, 150, 200, 250, 300 μg/L either at 28ºC or 32ºC for 72h. Subsequently, larvae were tested for the ability to recover from stressful conditions by rearing in the control temperature (28ºC) without copper treatment for 10 days. The larvae of Waigieu seaperch (BW: 0.16±0.01 g; TL: 2.53±0.11 cm) were used for all treatments. The glass bottles with volume 1L were used and the density of fish was 10 larvae/L. Each treatment had three replicates. Survival, feeding rate, respiration and growth rate were determined at 24, 48 or 72h during the exposure period and after 10 days during the recovery period. The results showed that both high temperature and copper were significantly reduced survival, feeding rate, growth and respiration of larvae of Waigieu seaperch. There were significantly interactive effects of temperature and copper on all measured response variables, namely the effects of coppers were more pronounced at higher temperature. Delayed effects of copper and temperature were also significantly decreased survival, feeding rate, growth and respiration of larvae of Waigieu seaperch. These results shed lights on how two global stressors that are extreme temperature and a common metal may interact to affect larvae production of Waigieu seaperch.
Keywords: Waigieu seaperch, Psammoperca waigiensis, temperature, copper, growth, respiration