Net ion fluxes and ammonia excretion during transport of Rhamdia quelen juveniles

Ciência Rural

Garcia, Luciano de Oliveira¹  Barcellos, Leonardo José Gil³  Baldisserotto, Bernardo² 

[1] Universidade Federal do Rio Grande (FURG), Rio Grande, Brazil;Universidade Federal de Santa Maria (UFSM), Santa Maria, Brazil;Universidade de Passo Fundo (UPF), Passo Fundo, Brazil

关键词: fish transport;    ionoregulation;    load density;   

DOI  :  10.1590/0103-8478cr20141420

学科分类：农业科学（综合）

来源: Universidade Federal de Santa Maria * Centro de Ciencias Rurais

【 摘 要 】

The objective of this study was to verify net ion fluxes and ammonia excretion in silver catfish transported in plastic bags at three different loading densities: 221, 286 and 365g L-1 for 5h. A water sample was collected at the beginning and at the end of the transport for analysis of water parameters. There was a significant positive relationship between net ion effluxes and negative relationship between ammonia excretion and loading density, demonstrated by the following equations: Na+: y-24.5-0.27x, r2=0.99, Cl-: y=40.2-0.61x, r2=0.98, K+: y=8.0-27.6x, r2=0.94; ammonia excretion: y=-11.43+0.017x, r2=0.95, where y: net ion flux (mmol kg-1 h-1) or ammonia excretion (mg kg-1 h-1) and x: loading density (g). Therefore, the increase of loading density increases net ion loss, but reduces ammonia excretion during the transport of silver catfish, indicating the possibility of ammonia accumulation

【 授权许可】

Unknown