Respostas fisiológicas em peixes neotropicais da espécie de Surubim pintado Pseudoplatystoma corruscans (Spix e Agassiz, 1829), produzidas por mudanças no nível de pressão sonora

Abstract

In recent years in oceans and rivers, there has been an increase in human activity that has changed the sound landscape of the aquatic environment. Studies are focused on investigating the effects of these agents on underwater animal life, expanded knowledge for terrestrial animals, mammals and more recently for fish of salt and fresh water. Both in fish and other vertebrates, there are studies that focus on vocalization, but there is still little research that investigates the physical and behavioral effects in fish and little is known about the effects in neotropical fish, which motivates the expansion of the underwater acoustic area in the investigation of its effects on the Brazilian ichthyofauna. Our proposal was to evaluate the physiological responses to stress induced by young fish in the laboratory, using blood parameters such as cortisol and glucose levels found in the moments after the standard handling with a step without experimental control and others with noise sounds with a characteristic frequency of 1kHz, using a JBS speaker via bluetooth connected to an Android phone (Sumsung J2). The fish were isolated first for two hours later for another hour, which allowed us the same handling for everyone and the physiological response obtained in the created condition, together with the blood extract. It was observed the stress generated in the short exposure to continuous and alternate noise, using the species Pseudoplatystoma corruscans, in the tests with 10 minutes of continuous exposure to sound exposure and 30 min with alternating sounds in two and three minutes of exposure. Both showed increased glucose (P = 0.014), indicating stress on species, but cortisol was not significant for these treatments.