Publication Date:
2021-07-06
Description:
The most common catch of the amateur angler is the perch and it is the diurnal periodicity of activity (& catchability) which is examined in this study based on earlier articles and manuscripts by the authors. Of all environmental factors, variation in light and temperature are the chief reasons in establishing the times of activity periods. Winter, summer and autumn activity was studied. The spawning perch was found to be more active than the non-spawning perch. The time of day in which the fish may be active is dependant on its ability to sense changes in the external environment. Its adaptation to light is the reason for day-activity in the winter, and also accounts for the fact that hardly any activity occurs between sunset and sunrise when this period exceeds 6 hours.
Description:
Translated from Finnish into English
Keywords:
Biology
;
Fisheries
;
Limnology
;
Freshwater fish
;
Activity patterns
;
Light effects
;
Seasons
;
Seasonal variations
;
Temperature effects
;
Water temperature
;
Perca fluviatilis
;
Finland
Repository Name:
AquaDocs
Type:
monograph
Format:
application/pdf
Format:
application/pdf
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