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Thorpe,

doi:10.2307/43628339

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“…Most of those dealt with systematizing and analyzing the effects of environmental variables on circadian rhythms (Schwassmann, 1971, this volume;Thorpe, 1978). Studies concerned with the anatomical location, biochemical mechanisms and physiological relationships to other systems were neglecter:!.…”

Section: Introductionmentioning

confidence: 99%

The Pineal Organ and Circadian Rhythms of Fishes

Kavaliers

1980

Environmental Physiology of Fishes

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Section: Introductionmentioning

confidence: 99%

The Pineal Organ and Circadian Rhythms of Fishes

Kavaliers

1980

Environmental Physiology of Fishes

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Movement of fish between a river and its backwater: diel activity and relation to environmental gradients

Hohausová

Copp

Jankovský³

2003

Ecology of Freshwater Fish

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– Movements of fish, in particular roach Rutilus rutilus, perch Perca fluviatilis, rudd Scardinius erythrophthalmus, bleak Alburnus alburnus and chub Leuciscus cephalus (age ≥ 1+) in relation to environmental variables were examined between the River Morava, Czech Republic, and a rehabilitated former meander. Data were taken over seven 24‐h periods in April–June 1997 using two back‐to‐back traps. Of 170 fish captured, 70% moved from the backwater to the river. Diel activity differed between sampling dates, but overall bleak, roach and chub moved mainly between dusk and dawn, whereas perch moved throughout most of the day. Rudd showed bi‐modal (mid‐day, midnight) activity. However, avoidance behaviour could have biased results for species known to be wary of traps. Water level changes, temperature and illumination were among the main environmental factors influencing fish movement, along with spawning migrations relevant for most species. In all specimens, over 65% individuals captured were ready to spawn. Most of them, except for perch, were moving out of the backwater towards the river.

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The Pineal Organ and Circadian Rhythms of Fishes

The Pineal Organ and Circadian Rhythms of Fishes

Movement of fish between a river and its backwater: diel activity and relation to environmental gradients

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