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Uso de redes de espera no estudo de ritmos circadianos de algumas espécies de peixes nos lagos de várzea do rio Solimões

1986; Sociedade Brasileira de Zoologia; Volume: 3; Issue: 7 Linguagem: Inglês

10.1590/s0101-81751986000300001

1806-969X

Ronaldo Borges Barthem,

Aquatic Ecosystems and Phytoplankton Dynamics

Rhythmic activity patterns are demonstrated for 15 species of fish in várzea lakes of the Solimões river by analyzing catch per hour-of-day data.Supplemented by visual observation, an array of six gillnets of equallength but different mesh size was used for collecting.The data, in general, show a bimodal pattern of activity.The two peaks of catch can be related to moveme.'1tduring twilight periods , white low catches can be ascribed to reduced activity during times close to mid-day or night Observed activity peaks correspond to local displacements of flsh between feeding and shelter sites.ln the case of piscivorous fishes, activity peaks could be explamed by facility in prey localization, which is greatest during twitight periods when prey species are moving.