Change in vertical distribution of sea bass (Dicentrarchus labrax L.) during a hypoxic episode
Tóm tắt
The vertical distribution of free-swimming sea bass (Dicentrarchus labrax L.) was investigated in a 26 m3 indoor tank by means of acoustic telemetry. During the experiment the bottom of the tank was made progressively hypoxic. In normoxic conditions, sea bass displayed a clear diurnal rhythm during which they occupied the surface at night and swam deeper in the water column during the day. When a vertical oxygen gradient was established, this behaviour changed and sea bass reduced the amplitude of their daily migration to avoid being exposed to the hypoxic bottom water layer.
Tài liệu tham khảo
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