Stress responses of juvenile matrinxã (Brycon amazonicus) after transport in a closed system under different loading densities

Ciência Rural

Janessa Sampaio De Abreu²  Ana Isabel Sanabria-ochoa¹  Flávio Daolio Gonçalves²  Elisabeth Criscuolo Urbinati¹ 

[1] ,Universidade Estadual Paulista Centro de Aqüicultura Jaboticabal SP ,Brasil

关键词: stress;    fish density;    transport;    water quality;    Brycon amazonicus;    estresse;    densidade;    transporte;    qualidade da água;    Brycon amazonicus;   

DOI  :  10.1590/S0103-84782008000500034

来源: SciELO

【 摘 要 】

Optimum loading density for the transport of matrinxã juveniles was investigated in a closed system with plastic bags. Transport was conducted for 4 h with fish (23.5± 0.4g and 11.6 (0.08cm) starved for 24h at loading densities of 83g L-1 (D1), 125g L-1 (D2), 168g L-1 (D3) and 206g L-1 (D4). Fish were sampled before transport (BT), after transport (AT) and 24h AT. The water quality was monitored before capturing fish in depuration tanks, after transport in plastic bags and in recovery tanks. Water oxygen decreased to values below 4mg L-1 in D2, D3 and D4, temperature was around 32°C, pH 6.5-6.78, total ammonia 1.09-1.7mg L-1, un-ionized ammonia 3.58-9.33x10³mg L-1 and alkalinity 134-165mg CaCO3 L-1. Blood cortisol and glucose concentrations increased in fish of all densities AT and recovered the BT levels 24h after arrival. Osmolality did not change AT but increased 24h AT in fish of all densities whereas plasma chloride decreased inversely to the loading densities after the procedure. Hematocrit decreased 24h AT in fish of all densities but no differences were verified in the number of erythrocytes. No mortality was registered in any treatment during the next week after transport. Matrinxã demonstrated to be a crowding tolerant-species in transport operations besides tolerating low levels of oxygen in the water.

【 授权许可】

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