Colisa lalia (Anabantidae) - Beutespucken

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Video in TIB AV-Portal: Colisa lalia (Anabantidae) - Beutespucken

Formal Metadata

Title
Colisa lalia (Anabantidae) - Beutespucken
Alternative Title
Colisa lalia (Anabantidae) - Preying by Means of Spitting
Author
License
CC Attribution - NonCommercial - NoDerivatives 3.0 Germany:
You are free to use, copy, distribute and transmit the work or content in unchanged form for any legal and non-commercial purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
Identifiers
IWF Signature
E 1674
Publisher
Release Date
1972
Language
Silent film
Producer
IWF
Production Year
1969

Technical Metadata

IWF Technical Data
Film, 16 mm, 21 m ; SW, 2 min

Content Metadata

Subject Area
Abstract
Der Zwergfadenfisch vermag über der Wasseroberfläche befindliche Beute durch Spucken zu erjagen. Dabei wird durch Zusammenpressen der Kiemendeckel das vorher angesogene Wasser in einer Serie tropfenweise abgegeben. Mit Zeitdehnung.
The film shows a male Colisa lalia in the act of spitting water. When the food (lightly attached to a small wooden stick which is held a few centimetres above the surface of the water) appears the fish swims diagonally upwards towards the surface in a way peculiar to it. Then it spits a series of water drops towards the food. The water it spits is sucked in through caudal and ventral, and is forced out through the mouth by the pressure of the opercula. The angle made by the body of the fish and the direction of the spit is a constant 158 ° (± 5 °). When the fish is in the process of spitting a change in the position of its body can often be observed, and this increases the certainty of its reaching the food. Should it miss its target in most cases it spits a new series of water drops towards the food. It often also leaps towards the food.
Keywords Labyrinthfisch Zwergfadenfisch Colisa lalia Spucken / Beutespucken Beuteerwerb / Pisces prey capture / Pisces spitting / prey-spitting Colisa lalia dwarf gourami labyrinthici Encyclopaedia Cinematographica
IWF Classification Biologie Perciformes - Barschartige Pisces - Fische Vertebrata - Wirbeltiere Ethologie, Morphologie Zoologie zoology ethology, morphology vertebrata - vertebrates pisces - fish perciformes - perch-like fishes biology
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