Fish Behavior by Day, Night and Twilight Ⅰ Overview Ⅱ Activities in Fishes 1. Feeding 2. Breeding Ⅲ Coral-Reef Fishes 1. Day-time 2. Night-time 3. Twilight.

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Presentation transcript:

Fish Behavior by Day, Night and Twilight Ⅰ Overview Ⅱ Activities in Fishes 1. Feeding 2. Breeding Ⅲ Coral-Reef Fishes 1. Day-time 2. Night-time 3. Twilight 4. Determination of twilight behavior in coral-reef fishes Ⅳ Diel Patterns in Other Habitat Types 1. Temperate lake 2. Temperate marine fishes Ⅴ Summary and Prospective

Ⅰ Overview

Ⅱ Activities in Fishes 1. Feeding

2. Breeding

Ⅲ Coral-Reef Fishes 1. Day-time

2. Night-time

3. Twilight

Five overlapping events at evening twilight that were essentiataly repeated in reverse at dawn. a. Migrations of diurnal fishes b. Cover-seeking of diurnal fishes c. Evacuation of the water column: the quiet period d. Emergence of the nocturnal fishes e. Migrations of nocturnal fishes

4. Determination of twilight behavior in coral-reef fishes

Ⅳ Diel Patterns in Other Habitat Types

1. Temperate lake

Other similarities between two systems: a.Dawn activities occurring at lower light levels than corresponding dusk activities b. Upsurge in non-feeding activities (e.g. agonistic behaviour) at dusk c. Ecological replacement stes, shifting to older individuals and larger-mouthed species at dusk d. A shift from group to individual activities in the evening e. A breakdown in characteristic twilight activtities during the breeding season f. An upsurge in predation at twilight

2. Temperate marine fishes

Ⅴ Summary and Prospective