Fish Behavior by Day, Night and Twilight

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Fish Behavior by Day, Night and Twilight

• ? Overview
• ? Activities in Fishes
• 1. Feeding
• 2. Breeding
• ? Coral-Reef Fishes
• 1. Day-time
• 2. Night-time
• 3. Twilight
• 4. Determination of twilight behavior in
  coral-reef fishes
• ? Diel Patterns in Other Habitat Types
• 1. Temperate lake
• 2. Temperate marine fishes
• ? Summary and Prospective

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? Overview
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? Activities in Fishes 1. Feeding
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2. Breeding
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? Coral-Reef Fishes 1. Day-time
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2. Night-time
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3. Twilight
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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
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4. Determination of twilight behavior in
coral-reef fishes
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? Diel Patterns in Other Habitat Types
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1. Temperate lake
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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
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2. Temperate marine fishes
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? Summary and Prospective
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